Burning 2.05 L/h, a 50 L tank lasts 24.4 h. Each kWh costs 0.79 € including wear: 3.1× the grid price and 4.4× solar + battery.
Fuel consumption
2.05L/h
5 kW output (50% load)
Runtime per tank
24.4hours
Energy per L
2.44kWh/L
fuel-to-electric efficiency 24%
Fuel cost per kWh
0.656€/kWh
Total cost per kWh
0.786€/kWh
fuel + maintenance + engine wear
Fuel per month
492L
240 running hours
Monthly running cost
€847
1,200 kWh generated
Same energy from grid
€300
Same energy from solar + battery
€216
CO₂ per kWh
1.1kg
1,319 kg per month
Load table
| Load | Output (kW) | Fuel (L/h) | kWh/L | Fuel cost (€/kWh) | Runtime per tank (h) |
|---|---|---|---|---|---|
| 10% | 1 | 1.05 | 0.95 | 1.68 | 47.6 |
| 20% | 2 | 1.3 | 1.54 | 1.04 | 38.5 |
| 25% | 2.5 | 1.43 | 1.75 | 0.912 | 35.1 |
| 30% | 3 | 1.55 | 1.94 | 0.827 | 32.3 |
| 40% | 4 | 1.8 | 2.22 | 0.72 | 27.8 |
| 50% | 5 | 2.05 | 2.44 | 0.656 | 24.4 |
| 60% | 6 | 2.3 | 2.61 | 0.613 | 21.7 |
| 70% | 7 | 2.55 | 2.75 | 0.583 | 19.6 |
| 75% | 7.5 | 2.68 | 2.8 | 0.571 | 18.7 |
| 80% | 8 | 2.8 | 2.86 | 0.56 | 17.9 |
| 90% | 9 | 3.05 | 2.95 | 0.542 | 16.4 |
| 100% | 10 | 3.3 | 3.03 | 0.528 | 15.2 |
- Fuel curve: F = a × P_rated + b × P_out (the linear model used by HOMER and most generator datasheets). Defaults match typical small-to-medium sets; enter your datasheet's 25/50/75/100% figures for accuracy.
- Inverter generators throttle the engine at low load and beat this curve by 20–40% below half load.