Generators
500 kVA Generator Fuel Consumption Guide
A 500 kVA generator typically consumes in the region of 80–100 litres of diesel per hour at full load, scaling down roughly proportionally at partial load. Actual consumption depends on the load factor, ambient conditions and engine efficiency.
| Approx. full-load consumption | 80–100 L/hour |
|---|---|
| Approx. 50% load consumption | 45–55 L/hour |
| Main variable | Actual load factor, not nameplate capacity |
Why load factor matters more than nameplate size
Diesel generators are far more efficient running close to their rated load than running lightly loaded. A 500 kVA generator running at 30% load burns noticeably less fuel per hour than at 80% load, but the fuel-per-kWh delivered is usually worse at very light loads.
For accurate planning, estimate your actual average load across the shift, not just the generator's nameplate rating.
Worked example
A site running a 500 kVA generator at roughly 60% average load for a 10-hour shift might expect consumption in the region of 60–70 litres per hour, or 600–700 litres across the shift. This is an estimate: confirm figures against the specific unit's fuel curve for firm planning.
Common mistakes
- Planning fuel budgets off the generator's maximum rated consumption rather than expected average load.
- Not accounting for idle/standby running time between active load periods.
Related questions
It reduces litres per hour, but not necessarily fuel efficiency per unit of power delivered: very light loading for extended periods can also cause engine wet-stacking issues.
Reviewed 2026-09-01. Technical references: manufacturer documentation and internal fleet data.