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100Ah battery runtime at 1500 watts
100Ah 12V lithium battery running 1500W (AC, 90% inverter) · 0 h 22 min on lead-acid/AGM
100Ah battery at 1500W – by battery type
| Battery type | Usable energy | Runtime (AC load) | Runtime (DC load) |
|---|---|---|---|
| LiFePO4 lithium (90% usable) | 1,080 Wh | 0 h 39 min | 0 h 43 min |
| Gel (80% usable) | 960 Wh | 0 h 35 min | 0 h 38 min |
| Lead-acid / AGM (50% usable) | 600 Wh | 0 h 22 min | 0 h 24 min |
Battery current 138.9 A (1.39C). Energy = 100Ah × 12 V = 1,200 Wh.
Same battery, other loads
FAQ
How long will a 100Ah 12V battery run a 1500W load?
A 100Ah 12V lithium (LiFePO4) battery stores 1,200 Wh and, using 90% of it through a 90% efficient inverter, runs a 1500W AC load for about 0 h 39 min. A lead-acid or AGM battery limited to 50% depth of discharge lasts about 0 h 22 min.
How many amps does a 1500W load draw from a 12V battery?
About 138.9 A from the battery through a 90% efficient inverter (125.0 A for a DC load with no inverter).
Why is the real runtime shorter?
High discharge currents reduce usable capacity (Peukert effect in lead-acid), cold weather cuts capacity, batteries age, and many appliances draw more than their label while starting. Treat the number as an upper estimate.
Other battery sizes at 1500W: 50Ah · 200Ah · 300Ah · battery runtime calculator · all combinations
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