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200Ah battery runtime at 50 watts
200Ah 12V lithium battery running 50W (AC, 90% inverter) · 21 h 36 min on lead-acid/AGM
200Ah battery at 50W – by battery type
| Battery type | Usable energy | Runtime (AC load) | Runtime (DC load) |
|---|---|---|---|
| LiFePO4 lithium (90% usable) | 2,160 Wh | 38 h 53 min | 43 h 12 min |
| Gel (80% usable) | 1,920 Wh | 34 h 34 min | 38 h 24 min |
| Lead-acid / AGM (50% usable) | 1,200 Wh | 21 h 36 min | 24 h 00 min |
Battery current 4.6 A (0.02C). Energy = 200Ah × 12 V = 2,400 Wh.
Same battery, other loads
FAQ
How long will a 200Ah 12V battery run a 50W load?
A 200Ah 12V lithium (LiFePO4) battery stores 2,400 Wh and, using 90% of it through a 90% efficient inverter, runs a 50W AC load for about 38 h 53 min. A lead-acid or AGM battery limited to 50% depth of discharge lasts about 21 h 36 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: 50Ah · 100Ah · 300Ah · battery runtime calculator · all combinations
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