Marine Retrofit Electrical Load, Generator & Switchboard Capacity Tool

Ship Universe Retrofit Electrical Engineering Tool

Marine Retrofit Electrical Load, Generator & Switchboard Capacity Tool

Test whether a new shipboard retrofit can fit inside the existing electrical plant. Model generator headroom, reserve requirement, transformer loading, switchboard current, power factor, starting-current exposure and the minimum equipment ratings needed when the retrofit pushes the vessel beyond existing capacity.

Existing Electrical Plant

Enter the vessel's present coincident load before the proposed retrofit.

Main bus voltage

Existing coincident electrical load

Existing load power factor

Future growth margin

Proposed Retrofit Load

Retrofit connected load

Retrofit demand factor

Retrofit power factor

Largest starting load

Starting current multiplier

× running

Simplified inrush screen. Actual motor starting and converter behavior varies.

Generator Capacity

Online generators

units

Rated capacity per generator

Generator available capacity

Preferred maximum generator loading

Required reserve above design load

Switchboard & Transformer

Main switchboard continuous rating

Preferred switchboard loading

Transformer / converter rating

kVA

Enter 0 if the retrofit is supplied directly from the main bus and no transformer capacity screen is needed.

Transformer available capacity

Preferred transformer loading

Existing Electrical System

Main bus voltage

Existing coincident load

Existing load power factor

Future growth margin

Retrofit Load Package

Add each major retrofit consumer separately. Starting multiplier is used only for a simplified single-largest-start event screen.

Retrofit Load	Connected kW	Demand %	PF	Start ×

Generator Plant

Generator	Rated kW	Available %	Online

Preferred maximum generator loading

Required reserve above design load

Switchboard & Transformer

Main switchboard continuous rating

Preferred switchboard loading

Transformer / converter rating

kVA

Transformer available capacity

Preferred transformer loading

Enter the existing electrical load, retrofit package and equipment ratings to build the retrofit capacity screen.

Retrofit Electrical Decision N/A

Retrofit Demand N/A

Post-Retrofit Design Load N/A

Generator Headroom N/A

Connected Retrofit Headroom N/A

Electrical Power Path Fast bottleneck view from generation to the new retrofit consumers

Generation N/A

N/A

›

Main Switchboard N/A

N/A

›

Transformer / Converter N/A

N/A

›

Retrofit Package N/A

N/A

Capacity Envelope Existing load plus retrofit design load against each equipment limit

Retrofit Load Build-Up From today's vessel load to future design basis

Retrofit Bottleneck Ladder Identifies the first electrical constraint triggered by the added load

Minimum Capacity Upgrade Screen Approximate minimum ratings required to carry the entered retrofit package

Model approach: retrofit coincident kW equals connected kW multiplied by demand factor. Apparent power equals kW divided by power factor. Three-phase current is kVA × 1,000 divided by √3 × line voltage. Post-retrofit design load includes the entered future growth margin. Generator reserve requires available generation to exceed design kW by the entered reserve percentage. Preferred generator, transformer and switchboard loading limits are treated separately from absolute nameplate ratings. Starting current is a simplified single-largest-start screen and does not model transient voltage dip or generator subtransient response.

Electrical engineering screening estimate only. This tool does not replace a vessel load analysis, short-circuit study, protection-coordination study, harmonic study, motor-starting analysis, voltage-drop study, arc-flash assessment or class-approved electrical design. Actual retrofit feasibility depends on bus topology, generator transient performance, breaker interrupting and continuous ratings, transformer thermal capability, cable ampacity, harmonic distortion, converter characteristics, voltage and frequency limits, motor starting method, load sequencing and redundancy requirements. Starting-current results use a simplified multiplier and should not be interpreted as a calculated voltage-dip result. Validate final generator, transformer, switchboard, feeder and protection sizing with vessel-specific electrical engineering data.

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