Marine Generator Load Sharing, Fuel Consumption & N-1 Capacity Tool

Load Sharing • Spinning Reserve • Fuel Burn • SFOC • Dispatch Optimisation • N-1 Generator Capacity • Daily Load Profile

Marine Generator Load Sharing, Fuel Consumption & N-1 Capacity Tool

Screen a ship service generator plant as an operating system, not just installed kW. Simple mode checks present load sharing, fuel use and loss-of-one-set loading. Advanced models individual generator SFOC curves, weighted load sharing, multi-phase load profiles, spinning reserve, N-1 survival and fuel-optimal generator combinations.

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Eight inputs, focused on the present generator lineup.The preferred minimum/maximum load bands are operating targets entered by the user, not universal class limits. The N-1 result assumes loss of one of the online identical sets.

SharingkW & load % per set

Fuelkg/h & t/day

RedundancyN-1 loading & reserve

Present Operating Point

Total ship service loadkW on the generator bus.

Online generator setsIdentical sets assumed in Simple mode.

Rated power per generatorkW electrical output per set.

SFOC at present loadingg/kWh. Use engine/OEM data when available.

Preferred minimum generator load% user-entered operating target.

Preferred maximum generator load% user-entered normal operating target.

N-1 maximum loading% user-entered contingency criterion.

Operating periodhours for fuel-total calculation.

Plant Operating Targets

Spinning reserve target% of online generator capacity.

N-1 maximum loading% of remaining individual generator rating.

Fuel densitykg/L for indicative L/h only.

Current dispatch mode

Optimiser reserve target% required for candidate dispatch combinations.

Optimiser N-1 required?

Generator Register

SFOC values are entered at 25%, 50%, 75% and 100% electrical load and linearly interpolated. Online units form the current plant. Available units are also considered by the dispatch optimiser.

Use	Available?	Online?	Generator	Rated kW	Share weight	Min preferred %	Max continuous %	SFOC 25%	SFOC 50%	SFOC 75%	SFOC 100%

24-Hour / Voyage Load Profile

Profile rows calculate energy and fuel by operating phase. The current online lineup is used for the detailed row-by-row ledger; the optimiser also checks alternative available generator combinations at each load.

Use	Operating phase	Hours	Bus load kW	Essential load kW

Power-Management / Data Checks

Generator continuous ratings verifiedElectrical kW ratings reflect the vessel's actual installed sets and ambient/service conditions. OEM SFOC curves checkedFuel-consumption inputs come from project/OEM data or credible measured performance. PMS start/stop philosophy reviewedAutomatic generator start, stop and standby timing are considered operationally. Load-shedding priorities reviewedNon-essential loads available for automatic shedding are understood. Largest motor-start event checked separatelySteady-state N-1 capacity does not replace transient motor-start / voltage-dip analysis. kW and kVAr sharing controls checkedGovernor active-power sharing and AVR reactive-power sharing are both operating correctly. Low-load operating limits checkedEntered preferred minimum load is consistent with engine/OEM maintenance guidance. Fuel-measurement basis checkedDensity, flowmeter correction and actual fuel condition are reconciled where measured fuel is used.

Engineering boundary: this is a steady-state operating and planning tool. It does not replace generator transient-response studies, motor-start voltage-dip analysis, short-circuit/protection studies, reactive-power sharing checks, blackout recovery analysis, OEM minimum-load guidance or class approval.

Technical basis: IEC 60092-201 addresses ship electrical system design and IEC 60092-301:2025 covers shipboard generators and motors. ABS rules require sufficient generation under normal seagoing conditions with one generator in reserve and also require motor-starting capability to be considered. Parallel generator operation requires both active-power (kW) and reactive-power (kVAr) sharing; this tool models active-power sharing and fuel use, while reactive sharing remains an external control/protection check.

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