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Interest in vessel electrification continues to grow across the maritime sector.

Vessel owners are exploring opportunities to reduce fuel consumption, lower emissions and improve operational efficiency through the adoption of battery systems, hybrid propulsion and shore power infrastructure.

The challenge is knowing where to begin.

Many organisations move directly to discussions about battery capacity, charging systems or equipment suppliers before fully understanding whether electrification is appropriate for their vessel and operational requirements.

This is where a feasibility study becomes valuable.

A marine electrification feasibility study provides the technical and commercial information needed to evaluate potential solutions before significant investment is made.

Why Conduct a Feasibility Study?

Every vessel is different.

Operational profiles vary.

Power demands differ.

Infrastructure constraints exist.

A solution that works effectively for one vessel may be unsuitable for another.

The purpose of a feasibility study is to remove assumptions from the decision-making process and replace them with engineering analysis.

The study should help answer questions such as:

• Can this vessel be electrified?
• Would a hybrid solution be more suitable?
• What battery capacity may be required?
• How would charging be achieved?
• What modifications are likely to be necessary?
• What are the expected costs and benefits?

By answering these questions early, owners can avoid costly mistakes and focus investment where it delivers the greatest value.

Understanding Vessel Operations

The first stage of any electrification study is understanding how the vessel operates.

Engineers will typically assess:

• Daily operating hours
• Typical routes
• Vessel speed profiles
• Operational duty cycles
• Time spent alongside
• Peak power requirements
• Auxiliary loads

This information forms the foundation of the analysis.

Without a clear understanding of vessel operations, it is impossible to develop a realistic electrification strategy.

Assessing Existing Systems

The vessel’s existing systems must also be understood.

This often involves reviewing:

• Propulsion arrangements
• Generators
• Electrical distribution systems
• Fuel systems
• Available machinery spaces
• Existing documentation

Where drawings are unavailable or outdated, vessel surveys may be required to verify existing conditions.

Understanding the starting point is essential before considering potential modifications.

Developing an Energy Model

Once operational data has been gathered, engineers can begin developing an energy model.

The objective is to understand how energy is consumed throughout a typical operating cycle.

This typically includes:

Propulsion Demand

Energy required to move the vessel through the water.

Hotel Loads

Electrical demand from onboard systems including lighting, communications, HVAC and navigation equipment.

Mission Equipment

Specialist equipment specific to the vessel’s role.

The resulting model provides a clear picture of total energy consumption and helps identify opportunities for electrification.

Evaluating Potential Solutions

With operational and energy data available, different technical options can be assessed.

Potential solutions may include:

Full Electric Operation

Suitable for vessels with predictable duty cycles and regular charging opportunities.

Hybrid Propulsion

Combining batteries with conventional engines or generators.

Shore Power Integration

Reducing generator operation while vessels are alongside.

Auxiliary Battery Systems

Supporting specific onboard loads without modifying the propulsion system.

The study should evaluate the advantages and limitations of each approach.

Battery Sizing Assessment

Battery sizing is often one of the most visible outputs of an electrification study.

However, it should be viewed as the result of the analysis rather than the starting point.

The assessment typically considers:

• Energy demand
• Operational reserves
• Charging opportunities
• System redundancy
• Future operational requirements

The objective is to identify a battery capacity that supports operational requirements without introducing unnecessary cost or weight.

Assessing Physical Integration

Technical feasibility is not solely an electrical question.

Battery systems, power electronics and associated equipment require physical space within the vessel.

Engineers must assess:

• Equipment locations
• Structural implications
• Access arrangements
• Ventilation requirements
• Cable routing
• Maintenance considerations

A technically attractive solution may prove impractical if integration challenges cannot be resolved.

Charging Infrastructure Assessment

Charging arrangements play a major role in project viability.

The study may evaluate:

• Shore power availability
• Existing electrical infrastructure
• Charging durations
• Port limitations
• Future charging requirements

Charging infrastructure often influences both battery sizing and overall project economics.

Evaluating Commercial Viability

A feasibility study should not focus solely on technical performance.

Commercial factors are equally important.

Typical considerations include:

• Capital costs
• Installation costs
• Fuel savings
• Maintenance savings
• Operational benefits
• Asset life implications

The objective is to determine whether the proposed solution makes sense from both an engineering and financial perspective.

Deliverables Typically Produced

The exact outputs vary between projects, but a feasibility study may include:

• Operational assessment
• Energy demand analysis
• Battery sizing calculations
• Technology options review
• Charging strategy assessment
• Integration considerations
• Preliminary engineering recommendations
• Economic assessment

These deliverables provide owners with a clear basis for future decision making.

Supporting Better Investment Decisions

One of the greatest benefits of a feasibility study is confidence.

Electrification projects often involve significant investment and long-term operational implications.

A structured assessment helps owners understand:

• What is possible
• What is practical
• What is likely to deliver value

This reduces uncertainty and supports more informed decision making.

Final Thoughts

Marine electrification presents significant opportunities, but successful projects begin with understanding rather than technology selection.

A feasibility study provides the information needed to evaluate technical options, assess commercial viability and identify the most appropriate path forward.

Before investing in batteries, charging infrastructure or hybrid propulsion systems, it is worth taking the time to understand what the vessel actually requires.

The best electrification projects are built on evidence, analysis and engineering judgement rather than assumptions.

As vessel electrification continues to expand across the maritime sector, battery systems are becoming an increasingly common feature on board commercial vessels.

From hybrid propulsion systems to fully electric vessels and auxiliary energy storage systems, batteries offer opportunities to reduce fuel consumption, lower emissions and improve operational efficiency.

However, battery installations require careful engineering.

Like any significant source of stored energy, batteries introduce risks that must be understood, assessed and managed appropriately.

Successful projects are not defined simply by battery capacity or vessel performance. They are defined by the ability to integrate energy storage safely and reliably throughout the life of the vessel.

Understanding the Role of Battery Systems

Battery systems perform a variety of functions depending on the vessel and operational requirements.

Applications may include:

• Propulsion support
• Peak load reduction
• Silent operation
• Hotel load support
• Emergency power
• Renewable energy integration

Each application places different demands on the system and influences how the installation should be designed.

Understanding the operational role of the battery is one of the first steps in developing a safe solution.

Selecting an Appropriate Installation Location

The location of a battery system is one of the most important design decisions.

The chosen space must consider a range of factors including:

• Structural support
• Access requirements
• Ventilation
• Environmental conditions
• Fire protection
• Cable routing
• Maintenance activities

Battery systems should not simply be installed wherever spare space is available.

The surrounding environment plays a major role in long-term system performance and safety.

Ventilation Considerations

Battery installations generate heat during charging and discharge cycles.

Managing this heat is essential to maintaining system performance and protecting equipment.

Ventilation requirements depend on:

• Battery chemistry
• System size
• Operating profile
• Environmental conditions

Poor ventilation can contribute to elevated temperatures and reduce system reliability.

For this reason, thermal management should be considered early in the design process rather than treated as an afterthought.

Monitoring and Control Systems

Modern marine battery systems incorporate sophisticated monitoring systems designed to continuously assess battery condition.

Parameters typically monitored include:

• Cell voltage
• Temperature
• State of charge
• Charge and discharge rates
• System alarms

These systems provide operators with valuable information regarding system performance and help identify potential issues before they become operational problems.

Monitoring is not simply a convenience feature.

It forms an important part of the overall safety strategy.

Fire Protection Considerations

Fire safety is a critical element of battery system design.

Battery spaces should be evaluated as part of the vessel’s wider fire protection strategy.

Considerations may include:

• Detection systems
• Suppression systems
• Compartment arrangements
• Isolation procedures
• Emergency response plans

The specific approach will depend on the vessel, battery technology and applicable regulations.

The objective is to ensure that potential incidents can be identified and managed effectively.

Electrical Protection

Battery systems can deliver significant electrical power.

As a result, protection systems play an essential role in maintaining safety.

Areas typically considered include:

• Overcurrent protection
• Isolation arrangements
• Fault protection
• Cable protection
• Emergency shutdown systems

Protection systems should be designed as part of the overall electrical architecture rather than added later in the project.

Weight and Stability Considerations

Battery installations can introduce substantial weight to a vessel.

The impact of this weight should always be evaluated during the design process.

Depending on the location and size of the installation, assessments may include:

• Weight calculations
• Centre of gravity considerations
• Stability impacts
• Structural assessments

A successful installation must be safe from both an electrical and naval architecture perspective.

Crew Training and Procedures

Technology alone does not create a safe system.

Crew members must understand how the equipment operates and how to respond to abnormal situations.

Areas that may require consideration include:

• Normal operating procedures
• Alarm responses
• Isolation procedures
• Emergency actions
• Maintenance activities

Clear procedures and appropriate training help ensure systems are operated safely throughout their service life.

Regulatory Considerations

Battery systems are becoming increasingly common, and regulatory guidance continues to evolve alongside the technology.

Depending on the vessel type and intended operation, projects may need to consider:

• Flag state requirements
• Classification society requirements
• Insurance considerations
• Operator requirements

Understanding applicable requirements early in the project can help avoid delays during implementation.

Safety Begins During Design

One of the most important lessons from successful electrification projects is that safety cannot be added at the end of a design.

Battery safety should be considered from the earliest stages of concept development.

Decisions relating to location, ventilation, protection systems, access and operational procedures all influence the overall safety of the installation.

Addressing these topics early generally produces simpler, more effective and more reliable solutions.

Final Thoughts

Battery systems are becoming an important part of the future maritime energy landscape.

When properly engineered, they can deliver significant operational and environmental benefits.

However, successful installations require more than selecting the right battery technology.

Safe integration depends on careful consideration of the vessel, its operational profile and the systems that support the battery throughout its life.

By approaching battery safety as a fundamental engineering requirement rather than a regulatory obligation, vessel owners and operators can create installations that are both effective and dependable.

For decades, vessels alongside a berth have typically relied on onboard generators to provide electrical power.

Even when propulsion systems are shut down, many vessels continue to require electricity for lighting, communications, navigation systems, HVAC equipment, refrigeration and a wide range of operational systems.

Traditionally, this demand has been met using onboard generation.

Shore power offers an alternative approach.

By connecting vessels directly to an electrical supply while alongside, operators can reduce generator running hours, lower fuel consumption and improve environmental performance within ports and marinas.

As electrification continues to develop across the maritime sector, shore power is becoming an increasingly important part of the conversation.

What Is Shore Power?

Shore power allows a vessel to receive electrical power from a land-based supply while berthed.

Instead of operating onboard generators, the vessel connects to dedicated electrical infrastructure installed on the quay, pontoon or berth.

Once connected, onboard electrical systems can be supplied from the shore network.

The concept is relatively simple.

The engineering required to implement it successfully is often more complex.

Why Is Shore Power Becoming More Common?

Several factors are driving increased interest in shore power infrastructure.

Reduced Fuel Consumption

Generators consume fuel even when vessels are stationary.

Providing power from shore can significantly reduce fuel use during time spent alongside.

Reduced Emissions

Reducing generator operation can lower emissions within ports and marinas.

This is particularly attractive in urban environments where air quality is becoming an increasingly important consideration.

Reduced Noise

Generator noise can affect crew, passengers, marina users and nearby communities.

Shore power can contribute to a quieter operating environment.

Reduced Equipment Wear

Reducing generator operating hours may lower maintenance requirements and extend equipment service life.

Which Vessels Can Use Shore Power?

A wide range of vessels can benefit from shore power connections.

Examples include:

• Workboats
• Harbour vessels
• Pilot boats
• Passenger vessels
• Ferries
• Research vessels
• Service vessels
• Leisure craft

The suitability of shore power depends on operational requirements, power demand and available infrastructure.

Understanding Electrical Demand

One of the first stages of any shore power assessment is understanding the vessel’s electrical requirements.

Questions typically include:

• How much power is required alongside?
• What systems remain operational while berthed?
• Are there seasonal variations in demand?
• How many vessels may connect simultaneously?

Without accurate demand information, infrastructure can be undersized or unnecessarily oversized.

Both outcomes create challenges.

The Infrastructure Challenge

Installing a shore power system involves far more than providing a socket on the quayside.

Infrastructure considerations may include:

• Grid connection capacity
• Distribution systems
• Transformers
• Protection systems
• Cable management
• Metering
• Future expansion requirements

The existing electrical infrastructure often plays a major role in determining project feasibility.

Standardisation and Compatibility

Not all vessels have identical electrical systems.

Differences may exist in:

• Voltage
• Frequency
• Connection arrangements
• Power ratings

Successful shore power projects must consider both the infrastructure and the vessels expected to use it.

Compatibility is a critical part of system design.

Planning for Future Growth

Many ports and marinas are experiencing increasing interest in electrification.

A system designed solely around today’s requirements may struggle to support future demand.

When evaluating shore power infrastructure, it is often beneficial to consider:

• Future vessel electrification
• Fleet growth
• Additional berths
• Battery charging requirements
• Regulatory developments

Forward planning can reduce the need for costly upgrades later.

Shore Power and Vessel Electrification

Shore power and vessel electrification are closely linked.

As battery-powered and hybrid vessels become more common, reliable charging infrastructure becomes increasingly important.

In many cases, the same infrastructure investments that support shore power today may also support future charging requirements.

For ports and marinas, this creates an opportunity to prepare for long-term changes within the maritime sector.

Building a Business Case

Like any infrastructure project, shore power systems should be assessed from both technical and commercial perspectives.

Factors commonly considered include:

• Capital costs
• Installation costs
• Operating costs
• Fuel savings
• Environmental benefits
• Maintenance impacts
• Future operational requirements

A successful project balances technical feasibility with long-term value.

Common Misconceptions

One common misconception is that shore power is only relevant to large commercial ports.

In reality, smaller marinas, workboat operators and harbour facilities may also benefit depending on vessel usage patterns.

Another misconception is that shore power projects are purely electrical installations.

In practice, they often involve operational planning, infrastructure assessment, future growth considerations and vessel integration requirements.

Final Thoughts

Shore power is becoming an increasingly important component of modern maritime infrastructure.

By allowing vessels to connect to electrical supplies while alongside, ports and operators can reduce fuel consumption, lower emissions and improve operational efficiency.

However, successful implementation requires a clear understanding of both vessel requirements and infrastructure capabilities.

The most effective projects begin with a detailed assessment of existing demand, future requirements and long-term operational objectives.

As electrification continues to develop across the maritime sector, shore power is likely to play an increasingly important role in supporting the vessels of tomorrow.

As fuel costs continue to fluctuate and pressure to reduce emissions increases, many vessel owners are exploring alternatives to traditional propulsion systems.

One of the most common questions being asked is whether an existing vessel can be converted to hybrid propulsion.

In many cases, the answer is yes.

However, not every vessel is a suitable candidate, and successful projects require far more than simply installing batteries on board.

Understanding whether a hybrid conversion is technically achievable and commercially worthwhile requires a detailed assessment of how the vessel operates and how its existing systems are configured.

What Is Hybrid Propulsion?

Hybrid propulsion combines traditional engines or generators with electrical energy storage systems.

The exact configuration can vary considerably depending on the vessel and its operational requirements.

Common arrangements include:

• Diesel-electric hybrid systems
• Battery-assisted propulsion
• Generator and battery combinations
• Shore charging with onboard generation backup

The objective is usually to improve efficiency while maintaining operational flexibility.

Why Vessel Owners Are Considering Hybrid Systems

Interest in hybrid propulsion is being driven by several factors.

Fuel Consumption

Many vessels spend significant periods operating at low power where conventional engines are less efficient.

Battery systems can often support these operating modes more effectively.

Emissions Reduction

Hybrid systems can reduce fuel consumption and associated emissions, particularly during low-speed operations and harbour manoeuvring.

Reduced Engine Running Hours

By allowing batteries to support part of the operational profile, engine operating hours may be reduced.

This can have a positive impact on maintenance requirements over time.

Future Readiness

Many operators are looking to future-proof assets as regulations, customer expectations and port infrastructure continue to evolve.

Hybrid systems can provide a practical stepping stone towards greater levels of electrification.

Understanding the Vessel’s Operational Profile

The first step in any hybrid conversion assessment is understanding how the vessel operates.

Questions include:

• How many hours does the vessel operate each day?
• What speeds are typically used?
• How often does the vessel return to shore?
• How much time is spent manoeuvring?
• What are the peak power requirements?
• What are the average power requirements?

The answers help determine where batteries may provide the greatest benefit.

A vessel operating long periods at steady high power may see different benefits compared to a vessel that spends much of its time manoeuvring or operating intermittently.

Assessing Existing Systems

Every vessel presents a unique engineering challenge.

Before proposing modifications, engineers must understand the existing installation.

Areas typically reviewed include:

• Propulsion systems
• Electrical distribution
• Machinery arrangements
• Generator capacity
• Available space
• Ventilation systems
• Cooling systems

The objective is to identify how a battery system could be integrated safely and effectively.

Space and Weight Considerations

Battery systems require physical space.

Unlike fuel tanks, batteries cannot simply be distributed throughout the vessel wherever space happens to be available.

Suitable locations must be identified that consider:

• Structural support
• Access requirements
• Ventilation
• Fire protection
• Cable routing
• Maintenance access

Weight is equally important.

The impact of additional equipment on vessel stability and loading conditions must be properly assessed before modifications proceed.

Charging Strategy

A hybrid system is only as effective as its charging strategy.

Potential charging methods may include:

• Shore power charging
• Onboard generators
• Renewable energy integration
• Combination approaches

The availability of charging infrastructure often influences both system architecture and battery sizing.

Technical Feasibility Is Only Part of the Decision

A technically achievable conversion is not automatically a good investment.

Owners also need to understand:

• Capital costs
• Fuel savings
• Maintenance impacts
• Equipment lifespan
• Operational benefits
• Return on investment

The most successful projects evaluate technical and commercial considerations together.

Common Misconceptions

One misconception is that hybrid propulsion is only suitable for new vessels.

Many existing vessels can benefit from electrification.

Another misconception is that batteries must replace existing engines entirely.

In reality, hybrid systems often work alongside conventional propulsion systems, providing flexibility while reducing fuel consumption.

The objective is not necessarily to eliminate diesel engines.

The objective is to use them more efficiently.

The Importance of a Feasibility Study

Before committing to a conversion project, it is important to understand both the opportunities and limitations presented by the vessel.

A feasibility study typically considers:

• Operational profile
• Energy demand
• Existing systems
• Battery sizing
• Charging options
• Weight implications
• Commercial viability

This provides owners with the information required to make informed decisions before significant investment is made.

Final Thoughts

Many vessels can be successfully converted to hybrid propulsion.

The key question is not whether a conversion is technically possible.

The key question is whether it delivers meaningful operational and commercial benefits for the specific vessel and its operating profile.

By understanding energy demand, vessel operations and integration requirements, owners can identify whether hybrid propulsion represents a practical pathway towards improved efficiency and reduced emissions.

Every vessel is different.

The most effective solutions are those developed around the realities of the vessel rather than assumptions about the technology.

When vessel owners begin exploring electrification, one question usually appears very early in the discussion.

How much battery capacity will the vessel need?

It is a reasonable question, but it is often approached in the wrong way.

Many assume battery capacity can be estimated from the size of the vessel alone. In reality, battery sizing is driven primarily by how the vessel operates.

Two vessels of similar size may have dramatically different energy requirements depending on their duty cycle, operating environment and mission profile.

Successful battery sizing begins with understanding how energy is used throughout a typical working day.

Understanding the Vessel’s Duty Cycle

Before any battery calculations are performed, engineers need to understand how the vessel operates.

Questions typically include:

• How many hours does the vessel operate each day?
• How often does it leave port?
• What speeds are normally used?
• How much time is spent manoeuvring?
• How much time is spent stationary?
• What auxiliary systems operate throughout the day?
• How frequently can the vessel be recharged?

The answers form the basis of an energy model.

Without this information, battery sizing becomes little more than guesswork.

Energy Demand Is More Important Than Vessel Size

A common misconception is that larger vessels always require larger battery systems.

While vessel size influences energy demand, operational requirements are usually the more significant factor.

For example, a small workboat operating continuously throughout the day may consume considerably more energy than a larger vessel undertaking short and infrequent trips.

Battery capacity should therefore be determined by the vessel’s energy consumption rather than its physical dimensions.

Calculating Daily Energy Consumption

The next step is establishing how much energy the vessel consumes during normal operations.

This typically includes:

Propulsion Loads

Propulsion is often the largest energy consumer on board.

Energy demand will vary depending on:

• Vessel speed
• Hull form
• Sea conditions
• Payload
• Operating profile

Hotel Loads

These include systems such as:

• Lighting
• Navigation equipment
• Communications systems
• HVAC systems
• Control systems

Although individually small, these loads can contribute significantly over long operating periods.

Mission Equipment

Many workboats operate specialist equipment including:

• Cranes
• Winches
• Survey systems
• Pumps
• Scientific equipment

These loads should be included within the overall energy assessment.

Accounting for Operational Reserves

Battery systems should not be sized solely around expected energy consumption.

Operational reserves are essential.

Unexpected delays, adverse weather and changing operational requirements can all increase energy demand.

For this reason, engineers typically include an appropriate reserve margin within the battery sizing process.

This provides additional flexibility and improves operational confidence.

Understanding Battery Usable Capacity

Not all installed battery capacity is available for routine operation.

Battery systems are generally operated within defined limits to support performance and long-term reliability.

For example, a battery system with an installed capacity of 500 kWh may not routinely use the full 500 kWh.

The usable energy available for operation may be lower depending on the battery chemistry, operating strategy and system design.

This distinction is important when developing energy models and evaluating operational capability.

The Role of Charging Infrastructure

Battery sizing should never be considered independently from charging arrangements.

Charging opportunities can significantly influence the required battery capacity.

For example:

• A vessel returning to port multiple times per day may require a smaller battery.
• A vessel operating continuously between charging opportunities may require a larger battery.

The availability of shore power infrastructure often has a direct impact on system design.

In many cases, investment in charging infrastructure can reduce the battery capacity required on board.

Full Electric vs Hybrid Systems

Battery sizing also depends on the selected propulsion architecture.

Fully Electric Systems

A fully electric vessel relies entirely on stored electrical energy.

This generally requires larger battery capacity and suitable charging infrastructure.

Hybrid Systems

Hybrid systems combine batteries with conventional generators or engines.

The battery system may be optimised for peak shaving, low-emission operation or fuel reduction rather than supporting the entire operational profile.

This often allows smaller battery capacities while still delivering meaningful benefits.

There Is No Standard Answer

One of the most important points to understand is that there is no universal battery size for a workboat.

A harbour vessel conducting short daily operations may require a relatively modest energy storage system.

An offshore support vessel operating for extended periods may require significantly greater capacity or a hybrid solution.

Every project must be evaluated against its own operational requirements.

Isca’s hybrid and electric marine systems service covers battery sizing, energy modelling, hybrid architecture and charging strategy — sized to how the vessel actually operates. Hybrid & Electric Marine Systems →

Why Energy Modelling Matters

Battery systems represent a significant investment.

Oversizing increases capital costs and may introduce unnecessary weight.

Undersizing can limit operational capability and create charging challenges.

Accurate energy modelling allows engineers to identify an appropriate balance between performance, operational flexibility and project cost.

It also provides vessel owners with confidence that the proposed solution will support real-world operations.

Final Thoughts

Battery capacity is one of the most important decisions within any vessel electrification project.

However, there is no simple formula based on vessel length or displacement alone.

Successful battery sizing begins with understanding how the vessel operates, how energy is consumed and what charging opportunities are available.

By developing an accurate operational and energy model, owners can make informed decisions that support both technical performance and long-term commercial viability.

The objective is not to install the largest battery possible.

The objective is to install the right battery for the job.

If you’re at the early stage of an electrification project, get in touch → — the first conversation is about your vessel’s operational profile, not about selecting hardware.

Across the maritime sector, electrification has moved from a future concept to a practical engineering consideration.

Advances in battery technology, increasing fuel costs, emissions regulations and improvements in charging infrastructure are encouraging vessel owners to explore alternatives to traditional propulsion and power systems.

However, one of the most common misconceptions is that vessel electrification begins with selecting batteries.

In reality, successful electrification projects start by understanding how a vessel operates.

Before considering technology solutions, it is important to establish what problem is being solved and whether electrification is the right approach.

Understanding the Objective

Every vessel has unique operational requirements.

Some operators are seeking to reduce fuel consumption.

Others want to lower emissions.

Some wish to improve operational efficiency or reduce maintenance requirements.

In certain cases, electrification may be driven by regulatory requirements or customer expectations.

Clearly defining the objective helps guide every decision that follows.

Without a clear objective, there is a risk of investing in technology that does not deliver meaningful benefits.

Analysing Vessel Operations

The next step is understanding how the vessel is actually used.

Questions that should be considered include:

• How many hours does the vessel operate each day?
• What are the typical duty cycles?
• How much time is spent at low power?
• How much time is spent at full power?
• Where does the vessel operate?
• How frequently does it return to shore?
• What charging opportunities are available?

The answers provide valuable insight into whether full electric operation, hybrid operation or conventional propulsion remains the most practical solution.

Establishing the Energy Demand

One of the most important stages of any electrification study is developing an energy profile.

This involves understanding how much energy the vessel consumes during normal operation.

The assessment typically includes:

• Propulsion loads
• Hotel loads
• Navigation systems
• Communications equipment
• Auxiliary systems
• Mission equipment

By quantifying energy demand, engineers can determine the scale of the electrical system required to support the vessel’s operation.

Evaluating Electrification Options

Electrification is not a single solution.

Several approaches may be appropriate depending on the vessel and its operational profile.

Full Electric

In a fully electric configuration, propulsion and onboard systems are powered entirely by batteries.

This approach is often suitable for vessels with predictable operating patterns and regular access to charging infrastructure.

Hybrid Systems

Hybrid systems combine batteries with conventional generators or engines.

This can provide many of the benefits of electrification while maintaining operational flexibility.

Hybrid solutions are often attractive for commercial workboats and vessels operating over variable duty cycles.

Shore Power Integration

In some cases, significant benefits can be achieved without modifying the propulsion system.

Connecting vessels to shore power while alongside can reduce fuel consumption, emissions and noise within ports and marinas.

Isca’s offshore electrification service covers shore power, vessel charging infrastructure and marina electrification — designed around the vessel’s real operational requirements. Offshore Electrification →

Considering Physical Constraints

Electrification projects are not solely about energy calculations.

The physical characteristics of the vessel must also be considered.

Questions include:

• Is sufficient space available for battery systems?
• Can the additional weight be accommodated?
• Are ventilation requirements understood?
• How will equipment be installed?
• Are existing systems suitable for integration?

Understanding these constraints early helps avoid costly redesign work later in the project.

Charging Infrastructure Matters

Many electrification projects focus heavily on onboard equipment while giving less attention to charging requirements.

Charging infrastructure often has a significant influence on project viability.

Factors to consider include:

• Available electrical supply
• Charging duration
• Vessel turnaround times
• Future expansion requirements
• Port infrastructure limitations

A technically successful vessel design may still prove impractical if charging arrangements cannot support operational requirements.

Building a Business Case

Technical feasibility is only one part of the decision-making process.

Operators also need to understand:

• Capital costs
• Fuel savings
• Maintenance impacts
• Operational benefits
• Asset lifespan considerations

A robust electrification study should consider both technical and economic factors.

The objective is to identify solutions that are practical, achievable and commercially viable.

There Is No Universal Solution

One of the key lessons from vessel electrification projects is that every vessel is different.

A solution that works effectively for a harbour workboat may be unsuitable for an offshore support vessel.

Similarly, a battery system designed for one duty cycle may perform poorly under another.

Successful projects are built around operational requirements rather than assumptions.

For vessels where a hybrid approach suits the duty cycle better than full electric, see Isca’s hybrid and electric marine systems service →

Final Thoughts

Vessel electrification offers significant opportunities across many areas of the maritime sector.

However, successful projects rarely begin with batteries or charging systems.

They begin with understanding the vessel, its operational profile and the objectives of the owner.

By developing a clear picture of energy demand, operational requirements and technical constraints, vessel owners can make informed decisions about the most appropriate path towards electrification.

The first step is not selecting technology.

The first step is understanding the problem that technology is intended to solve.

Refit projects often begin long before any equipment is installed or drawings are produced.

Before engineers can design modifications, assess equipment integration or develop installation plans, they need a clear understanding of the vessel’s current condition.

This is where a refit survey plays a critical role.

A properly executed survey provides the information required to reduce uncertainty, identify constraints and support informed engineering decisions throughout the project.

Whether the objective is installing new machinery, integrating battery systems, upgrading electrical infrastructure or planning a major refurbishment, the quality of the survey will often influence the success of the entire project.

Why Refit Surveys Matter

Many vessels have undergone years, or even decades, of modifications.

Equipment may have been replaced.

Pipework may have been rerouted.

Additional systems may have been installed.

Temporary solutions may have become permanent fixtures.

As a result, existing drawings do not always reflect the current state of the asset.

Designing modifications without verifying site conditions can introduce unnecessary risk and increase the likelihood of problems during installation.

A refit survey provides the information needed to design around reality rather than assumptions.

Understanding the Project Objectives

Before attending site, engineers first need to understand the scope of the proposed modification.

This helps determine what information should be collected during the survey.

Typical project objectives may include:

• Machinery replacement
• Battery installation
• Shore power integration
• Sensor upgrades
• Communications systems
• Structural modifications
• Accommodation refurbishments

Understanding the project goals ensures the survey captures the information required to support the subsequent design process.

Reviewing Existing Documentation

Prior to boarding the vessel, available documentation is typically reviewed.

This may include:

• General arrangement drawings
• Structural drawings
• Piping diagrams
• Electrical schematics
• Equipment schedules
• Previous modification records

The objective is not to assume the drawings are correct.

Instead, the documentation provides a starting point for understanding the vessel and identifying areas that require verification during the survey.

Physical Inspection of the Vessel

Once on board, engineers conduct a detailed inspection of the areas affected by the proposed modification.

This often includes:

• Machinery spaces
• Equipment rooms
• Technical spaces
• Deck areas
• Structural compartments
• Access routes

During the inspection, engineers assess:

• Available space
• Existing equipment
• Access restrictions
• Structural arrangements
• Cable routing
• Pipe routing
• Maintenance clearances

Photographs and notes are typically collected throughout the survey process.

Capturing Accurate Measurements

Accurate dimensions are essential for successful engineering design.

Depending on the complexity of the project, measurements may be obtained using:

• Traditional surveying methods
• Laser measurement tools
• 3D laser scanning systems

The objective is to ensure engineers have sufficient information to develop designs with confidence and minimise assumptions during later stages of the project.

For larger or more complex modifications, laser scanning is increasingly used to capture detailed spatial information.

Isca delivers refit survey and digital twin capture using survey-grade 3D laser scanning — the reliable starting point for every modification that follows. Start with a survey →

Identifying Constraints and Risks

One of the most valuable outcomes of a refit survey is the identification of constraints that may affect the project.

Examples include:

• Limited access routes
• Congested machinery spaces
• Structural obstructions
• Existing equipment conflicts
• Ventilation limitations
• Cable and pipe routing restrictions

Identifying these issues early allows engineers to address them during design rather than during installation.

This can significantly reduce project risk and avoid costly redesign work.

Assessing Future Installation Activities

A successful modification must not only fit within the vessel, it must also be installable.

Engineers therefore consider practical installation challenges during the survey.

Questions may include:

• Can equipment physically reach the installation location?
• Are lifting arrangements available?
• Is temporary removal of equipment required?
• Are structural modifications necessary?
• Will maintenance access remain adequate?

These considerations are often overlooked when relying solely on drawings.

Creating a Digital Reference

Where laser scanning is used, the survey data can be processed into a digital model of the vessel.

This creates a valuable engineering reference that can support:

• Retrofit planning
• Clash detection
• Equipment integration
• Future modifications
• Asset management

The resulting digital twin often continues to provide value long after the initial project has been completed.

Supporting Better Engineering Decisions

The purpose of a refit survey is not simply to collect measurements.

Its primary purpose is to provide engineers with the information needed to make informed decisions.

The better the information available at the start of a project, the lower the likelihood of unexpected issues emerging later.

Accurate survey data reduces uncertainty and improves confidence throughout the design and installation process.

Final Thoughts

Every vessel modification project depends on understanding the asset as it exists today.

While drawings and documentation remain important, they rarely tell the whole story.

A refit survey provides the information needed to verify existing conditions, identify constraints and develop designs that work in the real world.

For many projects, it is the first and most important step towards a successful outcome.

Ready to scope a refit? Get in touch → and we’ll respond within one working day.

For generations, marine engineering projects have relied on technical drawings.

General arrangements, piping diagrams, electrical schematics and structural drawings remain fundamental tools for vessel design, operation and maintenance. They provide a structured method of communicating engineering information and continue to play a critical role throughout the lifecycle of a vessel.

In recent years, however, digital twins have become increasingly common across the maritime sector. Advances in laser scanning and 3D modelling have made it possible to create highly accurate digital representations of existing assets.

This has led many owners and operators to ask an important question.

Do digital twins replace traditional drawings?

The answer is no.

The most effective projects typically use both.

The Purpose of Traditional Drawings

Engineering drawings are designed to communicate intent.

They show how a vessel was designed, how systems are arranged and how components are intended to function.

Examples include:

• General arrangement drawings
• Structural drawings
• Piping and instrumentation diagrams
• Electrical schematics
• Equipment layouts

These documents remain essential because they provide engineering information in a structured and widely understood format.

Without drawings, design, fabrication and construction activities would become significantly more difficult.

The Limitation of Drawings

The challenge is that drawings represent information at a specific point in time.

Once a vessel enters service, changes begin to occur.

Equipment is upgraded.

Systems are modified.

Pipework is rerouted.

Additional cabling is installed.

Repairs are completed.

Over the course of many years, these changes can accumulate to the point where the documentation no longer reflects reality.

Even well-maintained drawing packages may contain discrepancies between what is shown on paper and what exists on board.

What a Digital Twin Provides

A digital twin focuses on capturing reality.

Using technologies such as laser scanning, engineers can create a highly accurate representation of an existing asset.

Unlike a traditional drawing, which shows how a system was designed, a digital twin shows how it exists today.

The model can include:

• Structural arrangements
• Machinery
• Pipework
• Electrical systems
• Access routes
• Equipment locations

This provides project teams with a reliable reference point for engineering activities.

Where Traditional Drawings Excel

Drawings remain the preferred format for many engineering tasks.

They are particularly effective for:

• Design communication
• Construction documentation
• Fabrication packages
• Regulatory submissions
• Class submissions
• Technical specifications

They provide clear and concise information that can be reviewed, approved and distributed efficiently.

Digital twins do not replace these functions.

Where Digital Twins Add Value

Digital twins are particularly valuable when dealing with existing assets.

Applications include:

Vessel Modifications

Engineers can assess available space and identify potential clashes before installation begins.

Equipment Integration

New machinery, battery systems and sensors can be evaluated within the existing environment.

Retrofit Planning

Design decisions can be based on accurate measurements rather than assumptions.

Asset Management

Operators gain a detailed and up-to-date representation of their asset.

Future Projects

Survey information remains available long after the initial project has been completed.

Why the Best Projects Use Both

Traditional drawings and digital twins serve different purposes.

One communicates design intent.

The other captures physical reality.

When used together, they provide a far more complete understanding of the asset.

For example, a vessel owner planning a machinery upgrade may use:

• Existing drawings to understand system design
• A digital twin to verify current conditions
• Updated drawings to document the final modification

Each tool contributes to a successful project outcome.

The Direction of the Marine Industry

As vessels become more complex and project schedules become more demanding, accurate information becomes increasingly valuable.

Many owners are now viewing digital twins as a long-term asset rather than a project-specific deliverable.

By maintaining accurate digital representations of vessels and infrastructure, operators can improve planning, reduce risk and support future engineering activities more effectively.

At the same time, traditional engineering documentation remains essential and is unlikely to disappear.

The future is not digital twins instead of drawings.

It is digital twins working alongside drawings.

Isca captures the as-built and engineers from it — survey and naval architecture under one consultancy, so nothing is lost between the scan and the drawing. Survey & Digital Twin →

Final Thoughts

Traditional drawings remain one of the foundations of marine engineering.

However, they are only as accurate as the information they contain.

Digital twins provide a way of capturing the current condition of an asset and reducing the uncertainty that often exists when working with older vessels.

The most successful projects use both tools together.

One provides the engineering intent.

The other provides the reality.

When those two align, project teams can make better decisions, reduce risk and deliver modifications with greater confidence.

For projects involving vessel modifications, retrofits or system upgrades, see how Isca’s marine engineering service works →

For decades, vessel surveys have been carried out using tape measures, notebooks, sketches and photographs.

These traditional methods remain an important part of marine engineering and continue to play a role in many projects today. However, as vessel systems become increasingly complex and engineering projects demand greater accuracy, the limitations of manual measurement techniques become more apparent.

While a tape measure may appear to be the most cost-effective survey tool available, the true costs of inaccurate or incomplete information are often hidden until much later in the project.

The Challenge of Working with Existing Vessels

Unlike new build projects, vessel modifications must work within an environment that already exists.

Machinery spaces are often congested.

Pipework has been altered over time.

Additional cabling may have been installed.

Equipment may have been relocated without fully updating the drawings.

In many cases, engineers are attempting to design around a vessel that has evolved significantly since it was originally built.

Capturing accurate information in these environments is essential.

The Problem with Selective Measurements

When conducting a traditional survey, engineers typically collect measurements that appear relevant to the planned modification.

This approach is understandable. Time on board is often limited and surveyors naturally focus on the areas that seem important at the time.

The difficulty is that engineering projects evolve.

Questions arise during design.

New dimensions become necessary.

Potential clashes are identified.

Additional equipment is introduced.

If the required information was not captured during the original survey, engineers may need to return to the vessel to collect further measurements.

Each additional visit adds time, cost and programme risk.

Human Error Is Difficult to Eliminate

Even experienced engineers can make mistakes during manual surveys.

Measurements can be recorded incorrectly.

Reference points may be misunderstood.

Sketches can be interpreted differently by different members of the design team.

Photographs may not clearly show spatial relationships between equipment and structures.

Most projects can tolerate small errors.

Some cannot.

As tolerances become tighter and spaces become more congested, even minor inaccuracies can create significant challenges during installation.

Complex Spaces Are Difficult to Capture

Machinery spaces, equipment rooms and service voids often contain hundreds of individual components.

Recording every pipe, cable tray, support bracket and structural member manually is rarely practical.

As a result, survey information is often simplified.

This may be sufficient for basic planning purposes, but it can create problems when engineers attempt to install new equipment within already crowded environments.

The reality is often more complex than the survey data suggests.

The Cost of Incomplete Information

When information is missing, uncertainty enters the design process.

Engineers begin making assumptions.

Fabricators work with estimated dimensions.

Installation teams arrive expecting conditions that do not exist.

This can lead to:

• Design revisions
• Fabrication changes
• Delayed installations
• Additional site visits
• Increased labour costs
• Extended vessel downtime

These costs frequently exceed the cost of obtaining more accurate survey information at the start of the project.

How Laser Scanning Changes the Process

Modern laser scanning systems capture millions of measurements in a matter of hours.

Instead of collecting selected dimensions, engineers capture the entire environment.

The resulting point cloud creates a permanent record of the vessel as it existed on the day of the survey.

If questions arise later during the design process, engineers can return to the survey data rather than returning to the vessel.

This improves efficiency and reduces project risk.

Choosing the Right Survey Method

Not every project requires laser scanning.

For simple modifications, traditional measurement techniques may provide sufficient information.

The key is understanding the level of risk associated with the project.

As complexity increases, the value of comprehensive survey data increases with it.

Projects involving:

• Battery installations
• Machinery upgrades
• Structural modifications
• Equipment integrations
• Major refits

often benefit significantly from more advanced survey techniques.

Better Information Leads to Better Decisions

Successful engineering projects are built on reliable information.

The more accurately an asset is understood, the more effectively engineers can design, coordinate and deliver modifications.

While tape measures will always remain a useful tool, modern marine projects increasingly demand a level of accuracy and detail that traditional methods struggle to provide on their own.

Final Thoughts

The cost of measuring a vessel with tape measures is rarely found in the survey itself.

It appears later through assumptions, uncertainty, redesign work and installation challenges.

Survey-grade 3D laser scanning captures the entire environment in a matter of hours — a permanent, dimensionally reliable record that design teams can return to throughout the project. See how Isca approaches vessel survey →

For many projects, investing in accurate survey data at the beginning is one of the simplest ways to reduce risk and improve project outcomes.

Good engineering starts with good information.

Retrofitting equipment onto an existing vessel is rarely as straightforward as it appears on paper.

Whether the project involves installing battery systems, upgrading machinery, adding communications equipment or integrating new sensors, success depends on having an accurate understanding of the vessel as it exists today.

Unfortunately, many modification projects still begin using outdated drawings, incomplete records and manual measurements. While this may appear to save time initially, it often creates avoidable risks later in the project.

Here are five of the most common issues encountered when retrofit projects proceed without an accurate vessel survey.

1. Equipment Does Not Fit the Available Space

One of the most frequent challenges during retrofit projects is discovering that the available space is different from what the drawings suggest.

Over the life of a vessel, equipment may have been replaced, relocated or modified. Pipework and cabling are often rerouted to suit operational requirements, while temporary modifications sometimes become permanent installations.

A design that appears achievable in the office can quickly become problematic once equipment arrives on site.

The result may be redesign work, installation delays and additional project costs.

2. Unexpected Clashes Are Discovered During Installation

Marine engineering projects are often constrained by limited space.

Even relatively small equipment upgrades can create conflicts with:

• Existing pipework
• Cable trays
• Ventilation systems
• Structural members
• Access routes
• Maintenance clearances

When these clashes are identified late in the project, engineering teams are forced to make changes during installation rather than during design.

Resolving issues in the field is almost always more expensive than identifying them beforehand.

3. Fabrication Errors Increase

Fabrication relies on accurate dimensions.

If measurements are incomplete or based on outdated information, fabricated supports, foundations and pipework assemblies may not align with the actual vessel structure.

This can lead to:

• Rework
• Additional fabrication costs
• Installation delays
• Extended vessel downtime

Accurate survey data provides confidence that fabricated components will fit as intended when delivered to site.

4. Project Costs Become Difficult to Predict

Uncertainty is one of the largest drivers of project cost.

When engineers do not have reliable information about the vessel, assumptions are introduced into the design process.

Some assumptions may prove correct.

Others may not.

As the project progresses, unforeseen issues emerge and budgets begin to move.

Accurate survey information reduces uncertainty and improves confidence in project planning, procurement and installation activities.

5. Future Modifications Become More Difficult

A retrofit project should not only solve today’s problem.

It should also improve the quality of information available for future engineering work.

Without accurate documentation, the same challenges often reappear during subsequent modifications.

Operators find themselves repeatedly measuring spaces, verifying dimensions and investigating undocumented changes.

By capturing accurate survey data and developing an up-to-date digital model, owners create a valuable engineering resource that supports future projects throughout the life of the asset.

The Value of Modern Survey Techniques

Advances in laser scanning technology have transformed the way retrofit projects are planned.

Millions of measurements can be collected in a relatively short period of time, creating a detailed representation of the vessel and its systems.

Engineers can then design modifications around verified information rather than assumptions.

This improves design quality, reduces project risk and helps avoid costly surprises during installation.

Investing in Certainty

Survey work is sometimes viewed as an optional project cost.

In reality, it is often one of the most effective ways of reducing risk.

The cost of capturing accurate information is typically small when compared to the expense of redesign work, fabrication changes, installation delays or extended vessel downtime.

For many retrofit projects, an accurate survey is not simply a useful exercise. It is the foundation for successful engineering.

Isca starts every retrofit project by capturing the as-built — survey-grade 3D laser scanning that gives the engineering team verified dimensions to design from. Start with a survey →

Final Thoughts

Most vessel modification projects involve working within assets that have evolved over many years of operation.

Drawings may no longer reflect reality, undocumented changes may exist and available space is often more constrained than expected.

Starting with accurate survey data provides engineers with the information needed to design with confidence, minimise risk and deliver successful retrofit projects.

Before planning your next modification, it is worth asking a simple question:

Do you know exactly what is on board today?

If you’re planning a modification or retrofit and want to understand the scope involved, get in touch →