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50Ah battery runtime at 50 watts
50Ah 12V lithium battery running 50W (AC, 90% inverter) · 5 h 24 min on lead-acid/AGM
50Ah battery at 50W – by battery type
| Battery type | Usable energy | Runtime (AC load) | Runtime (DC load) |
|---|---|---|---|
| LiFePO4 lithium (90% usable) | 540 Wh | 9 h 43 min | 10 h 48 min |
| Gel (80% usable) | 480 Wh | 8 h 38 min | 9 h 36 min |
| Lead-acid / AGM (50% usable) | 300 Wh | 5 h 24 min | 6 h 00 min |
Battery current 4.6 A (0.09C). Energy = 50Ah × 12 V = 600 Wh.
Same battery, other loads
FAQ
How long will a 50Ah 12V battery run a 50W load?
A 50Ah 12V lithium (LiFePO4) battery stores 600 Wh and, using 90% of it through a 90% efficient inverter, runs a 50W AC load for about 9 h 43 min. A lead-acid or AGM battery limited to 50% depth of discharge lasts about 5 h 24 min.
How many amps does a 50W load draw from a 12V battery?
About 4.6 A from the battery through a 90% efficient inverter (4.2 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 50W: 100Ah · 200Ah · 300Ah · battery runtime calculator · all combinations
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