Emergency Source Capacity, UPS / Transitional Ride-Through, Blackout Transfer, Fuel or Battery Energy, Load Priority & SOLAS-Endurance Screening

Ship Emergency Power, UPS & Blackout Endurance Tool

Model the blackout chain instead of only generator kW. Screen the immediate UPS/transitional bridge, emergency-source restoration time, sustained emergency power, energy/fuel endurance and critical load sequence. Advanced mode adds individual emergency loads with different required durations, start/inrush events, emergency-generator fuel calculation, battery-source capacity, priority shedding and blackout-readiness checks.

Data type
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Need fuel, load priority and start-event detail? Click Advanced above.Add one row per emergency service with duration, demand, UPS protection, start inrush and shedding priority. Advanced calculates required emergency energy, emergency-generator fuel, battery-source endurance, worst start event, UPS/transitional reserve and a load-restoration ladder.

Fast Blackout Chain & Endurance Screen

Cargo and passenger presets use the common SOLAS emergency-power endurance references of 18 h and 36 h respectively. Short-voyage / project presets are planning inputs and must be accepted by the Administration where applicable.

kW, simultaneous emergency load.
kW available to the emergency bus.
kWh electrical equivalent. Generator users can obtain this from fuel inventory in Advanced.
kW.
kWh.
% after usable SOC and inverter/discharge losses.
seconds from blackout.
minutes. 30 min is the common SOLAS transitional-source reference where applicable.

Statutory / Planning Basis

hours. Cargo commonly 18 h; passenger commonly 36 h.
%.
seconds. 45 s is the SOLAS maximum generator start/supply reference where applicable.
minutes.

Emergency Load Register

Use one row per emergency service. Required duration lets 3 h, 18 h, 36 h and project-specific services coexist in one energy budget. UPS = must ride through before emergency-bus restoration.

Emergency serviceConnected kWDemand %Required duration hPriority 1-5UPS?Shedable after recovery?Start / inrush ×Concurrent starts

Emergency Generator & Fuel

kW.
%.
% project/OEM/class planning value.
kg/kWh.
L.
kg/L.
seconds.
seconds.

Battery / UPS / Transitional Supply

kWh, used when battery/hybrid source is selected.
kW AC output.
% including reserve / EOL allowance.
kWh.
kW.
%.
%.
% added to required bridge/transitional energy.

Emergency-Power Readiness

Emergency-power screening only: this tool does not replace SOLAS/class emergency-load analysis, generator transient study, battery discharge calculation, short-circuit/protection study, GMDSS reserve-energy calculation or vessel blackout-recovery test. Emergency-load simultaneity, motor starting, fuel-system independence, battery voltage limits and actual statutory service durations must be verified against the ship-specific approved basis.
SOLAS / 2026 context: SOLAS II-1/42 and 43 establish emergency-source requirements for passenger and cargo ships. Passenger-ship emergency services are commonly required for 36 h and cargo-ship services for 18 h, with specified exceptions and shorter-duration services. Emergency generators are generally required to carry the necessary load as quickly as practicable and within 45 s, while transitional emergency power requirements commonly use a 30-minute accumulator-battery basis for specified services. In 2026 IACS published results from its 2025 emergency-power concentrated inspection campaign covering 36,723 ships and emphasized better testing of emergency power arrangements. SOLAS II-1/42 Passenger Ships · SOLAS II-1/43 Cargo Ships · IACS 2026 Emergency Power Campaign Results
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