Charts
12V 100Ah battery runtime chart
This chart estimates AC runtime for a 12V 100Ah battery at common load levels. It cannot confirm that a battery or inverter can supply the requested power.
At a continuous AC load
Compare the 100W row, then use the calculator for your load.
Reference load 100 W
- LiFePO4
- 9.23 h
- AGM
- 4.59 h
Continuous load and duty cycle
Refrigerators and compressors cycle; nameplate watts are not continuous. Use measured average watts or 24-hour Wh.
| Load (W) | LiFePO4 preset (h) | AGM preset (h) |
|---|---|---|
| 10 | 92.34 | 45.9 |
| 20 | 46.17 | 22.95 |
| 30 | 30.78 | 15.3 |
| 50 | 18.47 | 9.18 |
| 75 | 12.31 | 6.12 |
| 100 | 9.23 | 4.59 |
| 150 | 6.16 | 3.06 |
| 200 | 4.62 | 2.3 |
| 300 | 3.08 | 1.53 |
| 400 | 2.31 | 1.15 |
| 500 | 1.85 | 0.92 |
| 600 | 1.54 | 0.77 |
| 800 | 1.15 | 0.57 |
| 1,000 | 0.92 | 0.46 |
| 1,500 | 0.62 | 0.31 |
| 2,000 | 0.46 | 0.23 |
- Load (W): 10
- LiFePO4 preset (h)
- 92.34
- AGM preset (h)
- 45.9
- Load (W): 20
- LiFePO4 preset (h)
- 46.17
- AGM preset (h)
- 22.95
- Load (W): 30
- LiFePO4 preset (h)
- 30.78
- AGM preset (h)
- 15.3
- Load (W): 50
- LiFePO4 preset (h)
- 18.47
- AGM preset (h)
- 9.18
- Load (W): 75
- LiFePO4 preset (h)
- 12.31
- AGM preset (h)
- 6.12
- Load (W): 100
- LiFePO4 preset (h)
- 9.23
- AGM preset (h)
- 4.59
- Load (W): 150
- LiFePO4 preset (h)
- 6.16
- AGM preset (h)
- 3.06
- Load (W): 200
- LiFePO4 preset (h)
- 4.62
- AGM preset (h)
- 2.3
- Load (W): 300
- LiFePO4 preset (h)
- 3.08
- AGM preset (h)
- 1.53
- Load (W): 400
- LiFePO4 preset (h)
- 2.31
- AGM preset (h)
- 1.15
- Load (W): 500
- LiFePO4 preset (h)
- 1.85
- AGM preset (h)
- 0.92
- Load (W): 600
- LiFePO4 preset (h)
- 1.54
- AGM preset (h)
- 0.77
- Load (W): 800
- LiFePO4 preset (h)
- 1.15
- AGM preset (h)
- 0.57
- Load (W): 1,000
- LiFePO4 preset (h)
- 0.92
- AGM preset (h)
- 0.46
- Load (W): 1,500
- LiFePO4 preset (h)
- 0.62
- AGM preset (h)
- 0.31
- Load (W): 2,000
- LiFePO4 preset (h)
- 0.46
- AGM preset (h)
- 0.23
Assumptions
LiFePO4 uses 90% depth of discharge and 95% battery efficiency. AGM uses 50% depth of discharge and 85% battery efficiency. Both use 90% inverter efficiency and 0W idle draw.
How runtime is estimated
The shared runtime model converts 12V × 100Ah to 1,200Wh, applies the selected usable-capacity and loss factors, then divides by the AC load.
Related calculator
Battery runtime calculator for Ah, Wh and wattsContinue with the 100Ah refrigerator guide
Read the 100Ah refrigerator guideRelated reference charts
Questions people ask
How long will a 100Ah battery run a 100W load?
With this chart's assumptions, about 9.23 hours for LiFePO4 or 4.59 hours for AGM. Inverter idle draw would reduce both.
Why can actual runtime be shorter?
Temperature, battery age, discharge rate, inverter idle draw, wiring losses, and equipment cutoff settings can all reduce runtime.