UPS Battery Runtime Calculator
UPS Battery Runtime Calculator
Estimated Runtime
204 min
3.4 hours at 300 W load
Battery Storage
1,200 Wh
100 Ah × 12 V
Usable Energy
1,020 Wh
85% efficiency
Load Ratio
25.0%
of battery capacity
Backup Projection
| Battery Capacity | 100 Ah |
| Battery Voltage | 12 V |
| Total Energy Stored | 1,200 Wh |
| Efficiency Loss | 15% |
| Usable Energy | 1,020 Wh |
| Continuous Load | 300 W |
| Estimated Runtime | 204 min (3.4 h) |
Runtime at Common Loads (minutes)
Highlighted bar = your current load. Real runtime shrinks as batteries age.
Summary Statistics
Energy Stored
1,200 Wh
Usable Energy
1,020 Wh
Runtime
204.0 min
Hours
3.40 h
Load
300 W
Battery Aging
3-yr-old battery ≈ 60–70% runtime
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