Aggregates the major electrical and mechanical aux-consumers to get the average running load and resulting genset load factor.
Formula
$$ P_\text{AE} = P_\text{hotel} + P_\text{deck} + P_\text{nav} + P_\text{ER} + P_\text{reefer} + P_\text{pump} $$
$$ \text{Load factor} = \frac{P_\text{AE}}{P_\text{installed}} $$
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| $P_\text{AE}$ | Average auxiliary-engine electrical load | kW | result |
| $P_\text{hotel}$ | Hotel, galley, HVAC | kW | electrical load analysis |
| $P_\text{deck}$ | Routine deck machinery | kW | electrical load analysis |
| $P_\text{nav}$ | Bridge, navigation and communications | kW | electrical load analysis |
| $P_\text{ER}$ | Engine-room auxiliaries (pumps, fans, purifiers…) | kW | electrical load analysis |
| $P_\text{reefer}$ | Reefer plugs at average utilisation | kW | cargo plan |
| $P_\text{pump}$ | Cargo pump / compressor | kW | cargo plan |
| $P_\text{installed}$ | Total installed aux generator capacity | kW | genset nameplate sum |
A well-designed plant sits at 50–70 % load factor with the largest genset running. Below 30 % means oversized plant with poor SFOC; above 80 % a single genset failure tips over to black-out.
Sources
- IMO MEPC.231(65) - EEDI guidelines §2.5.6 aux power table.
- ABS - Ship Energy Efficiency Measures Advisory.