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100Ah battery runtime at 300 watts
100Ah 12V lithium battery running 300W (AC, 90% inverter) · 1 h 48 min on lead-acid/AGM
100Ah battery at 300W – by battery type
| Battery type | Usable energy | Runtime (AC load) | Runtime (DC load) |
|---|---|---|---|
| LiFePO4 lithium (90% usable) | 1,080 Wh | 3 h 14 min | 3 h 36 min |
| Gel (80% usable) | 960 Wh | 2 h 53 min | 3 h 12 min |
| Lead-acid / AGM (50% usable) | 600 Wh | 1 h 48 min | 2 h 00 min |
Battery current 27.8 A (0.28C). Energy = 100Ah × 12 V = 1,200 Wh.
Same battery, other loads
FAQ
How long will a 100Ah 12V battery run a 300W load?
A 100Ah 12V lithium (LiFePO4) battery stores 1,200 Wh and, using 90% of it through a 90% efficient inverter, runs a 300W AC load for about 3 h 14 min. A lead-acid or AGM battery limited to 50% depth of discharge lasts about 1 h 48 min.
How many amps does a 300W load draw from a 12V battery?
About 27.8 A from the battery through a 90% efficient inverter (25.0 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 300W: 50Ah · 200Ah · 300Ah · battery runtime calculator · all combinations
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