Runtime = Ah × 12 V × usable depth × inverter efficiency ÷ load. The chart uses 90% usable capacity for LiFePO4, 50% for lead-acid and a 90% efficient inverter.
| Battery | 50 W | 100 W | 200 W | 300 W | 500 W | 1000 W | 1500 W |
|---|---|---|---|---|---|---|---|
| 50 Ah | 9.7 h | 4.9 h | 2.4 h | 1.6 h | 1.0 h | 0.5 h | 0.3 h |
| 100 Ah | 19.4 h | 9.7 h | 4.9 h | 3.2 h | 1.9 h | 1.0 h | 0.6 h |
| 150 Ah | 29.2 h | 14.6 h | 7.3 h | 4.9 h | 2.9 h | 1.5 h | 1.0 h |
| 200 Ah | 38.9 h | 19.4 h | 9.7 h | 6.5 h | 3.9 h | 1.9 h | 1.3 h |
| 280 Ah | 54.4 h | 27.2 h | 13.6 h | 9.1 h | 5.4 h | 2.7 h | 1.8 h |
| 300 Ah | 58.3 h | 29.2 h | 14.6 h | 9.7 h | 5.8 h | 2.9 h | 1.9 h |
| 400 Ah | 77.8 h | 38.9 h | 19.4 h | 13.0 h | 7.8 h | 3.9 h | 2.6 h |
| Battery | 50 W | 100 W | 200 W | 300 W | 500 W | 1000 W | 1500 W |
|---|---|---|---|---|---|---|---|
| 50 Ah | 5.4 h | 2.7 h | 1.4 h | 0.9 h | 0.5 h | 0.3 h | 0.2 h |
| 100 Ah | 10.8 h | 5.4 h | 2.7 h | 1.8 h | 1.1 h | 0.5 h | 0.4 h |
| 150 Ah | 16.2 h | 8.1 h | 4.0 h | 2.7 h | 1.6 h | 0.8 h | 0.5 h |
| 200 Ah | 21.6 h | 10.8 h | 5.4 h | 3.6 h | 2.2 h | 1.1 h | 0.7 h |
| 280 Ah | 30.2 h | 15.1 h | 7.6 h | 5.0 h | 3.0 h | 1.5 h | 1.0 h |
| 300 Ah | 32.4 h | 16.2 h | 8.1 h | 5.4 h | 3.2 h | 1.6 h | 1.1 h |
| 400 Ah | 43.2 h | 21.6 h | 10.8 h | 7.2 h | 4.3 h | 2.2 h | 1.4 h |
High loads drain lead-acid batteries faster than the chart shows (Peukert effect). Check the battery's maximum discharge current before running large loads.
For estimating and educational purposes only. Results are approximate and are not a substitute for a licensed professional, the manufacturer's instructions or your local code. Disclaimer
Run 12 V appliances directly when possible to skip inverter losses, and switch to a 24 V or 48 V bank for loads above about 1,500 W to keep currents manageable.
About 58 minutes on LiFePO4 and 32 minutes on lead-acid, through an inverter.
About 19 hours at 100 W, or 1.9 hours at 1,000 W, on LiFePO4.
