Retrofit Demand Load, Generator Reserve, Main-Bus Current, Motor Starting, Load Shedding, N-1 & Emergency Power

Marine Retrofit Electrical Load, Generator & Switchboard Capacity Tool

Screen whether a new shipboard electrical retrofit fits the existing generating plant and main switchboard before detailed design. Simple mode converts the retrofit's connected kW into realistic demand kW and added current. Advanced mode adds individual loads, power factor, start/inrush events, load shedding, N-1 generator margin, emergency-generator impact and short-circuit withstand checks.

Data type
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Need motor starts, N-1 or emergency power? Click Advanced above.Add each retrofit load with demand factor, PF, start method, inrush multiple, concurrent starts, load-shedding status and emergency-service flag. Advanced also compares entered fault-current study values with switchboard withstand.

Fast Generator & Switchboard Capacity Screen

Simple mode screens normal running load only. Motor starting, transient voltage/frequency response, harmonic loading, cable protection and fault level belong in Advanced or the detailed electrical study.

kW at the screened operating condition.
kW connected load.
% of connected load expected simultaneously.
V, three-phase.
Total kW from normally online sets.
% project/OEM/class planning limit.
A.
A.
%.

Main Power Plant & Switchboard

V, three-phase.
kW.
kW.
%.
% of online generator capacity.
A.
%.
kA from existing short-circuit study.
kA from vendor/project study.
kA.

Retrofit Load Register

Rated kW is treated as electrical input power. Inrush multiple applies to full-load current. The tool uses the largest declared start event as the worst single starting case; simultaneous starting of different rows must be modeled explicitly by combining them into one start event.

Retrofit loadQtyRated kW / unitDemand %PFStart methodInrush × FLAConcurrent startsLoad shed?Emergency bus?

Emergency Power & Essential Load

kW.
kW.
%.

Retrofit Electrical Readiness

Electrical screening only: this tool does not replace class-approved load analysis, motor-start/transient study, short-circuit study, protection coordination, harmonic analysis, cable sizing or emergency-power assessment. Generator kW margin alone does not establish acceptable voltage/frequency response during starting or converter transients.
Current class context: IACS Unified Requirements include a dedicated Electrical and Electronic Installations (E) series of minimum requirements, while individual class societies may apply more stringent rules. DNV's current ship/offshore rules are maintained through its Rules & Standards Explorer, and retrofit approvals commonly involve electrical/control-system review alongside the affected disciplines. IACS Unified Requirements · DNV Rules & Standards
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