Auxiliary Engines - N-1 Redundancy Check
Verify electrical load coverage with the largest auxiliary generator out per SOLAS Chapter II-1 redundancy rule.
Total online capacity
4,500kW
Capacity with N-1
3,000kW
N-1 compliance
Compliant - covers essentials plus transient
Formula, assumptions, and limits
SOLAS Chapter II-1 Part D requires the main electrical source to cover essential services with the largest single generator out (the N-1 rule). The remaining generators must provide enough capacity for essential services plus the largest single motor starting transient (e.g. bow thruster start). Margin of 10 to 20 percent above N-1 minimum is typical industry practice.
Symbol legend
| Symbol | Meaning | Unit | Source |
|---|---|---|---|
| Number of generators online | units | operations | |
| Capacity per generator | kW | nameplate | |
| Essential ship services load | kW | load schedule | |
| Largest single transient load | kW | load schedule |