ECO-WORTHY 12V 100Ah LiFePO4 Battery with Bluetooth
Meets estimateCatalog lists 1,280 Wh versus your entered 1,200 Wh.
View product specifications →12V Battery Runtime Calculator (Free)
This free calculator estimates how long a battery runs a continuous load, or how much capacity you need for a target runtime. Enter amp-hour (Ah) capacity and nominal voltage — the tool converts to watt-hours (Wh) as Ah × V — then applies your usable capacity fraction and divides by load watts.
Higher appliance or inverter load in watts shortens runtime proportionally. Wiring, BMS limits, chemistry, temperature, and conversion losses are not modeled separately — reflect those effects in your load estimate or usable fraction. Results are planning estimates, not guarantees of field performance. Compare catalog products below only after you interpret the runtime output for your system.
Your inputs
Calculation breakdown
Estimated runtime at continuous load
5 hr 24 min
- Nameplate battery capacity
- 1,200 Wh
- Usable fraction applied
- 90%
- Usable energy available
- 1,080 Wh
- Continuous load
- 200 W
- Estimated runtime
- 5 hr 24 min
100 Ah × 12 V
Planning assumption — do not treat as manufacturer depth-of-discharge guarantee.
1,200 Wh × 90%
1,080 Wh ÷ 200 W
Catalog products near this estimate
Recommendations are generated from published specifications in the product catalog. No products are hard-coded — suitability is computed at runtime from listed capacity values.
Power Queen 12V 100Ah LiFePO4 Battery Group 24, Lithium Deep Cycles Battery, Built-in 100A BMS, Up to 15000 Deep Cycles, Perfect for RV, Marine, Off-Grid Cabin
Meets estimateCatalog lists 1,280 Wh versus your entered 1,200 Wh.
View product specifications →Redodo 12V 100Ah Group 24 LiFePO4 Battery with Bluetooth
Meets estimateCatalog lists 1,280 Wh versus your entered 1,200 Wh.
View product specifications →LiTime 12V 100Ah LiFePO4 Battery BCI Group 31 Lithium Battery Built-in 100A BMS, Up to 15000 Deep Cycles, Perfect for RV, Marine, Home Energy Storage
Meets estimateCatalog lists 1,200 Wh versus your entered 1,200 Wh.
View product specifications →Power Queen 12V 300Ah LiFePO4 Battery
Close matchCatalog lists 3,840 Wh versus your entered 1,200 Wh.
View product specifications →Renogy 12V 300Ah Mini Size LiFePO4 Lithium Battery
Close matchCatalog lists 3,600 Wh versus your entered 1,200 Wh.
View product specifications →Related planning resources
Battery runtime FAQ
How do I calculate battery runtime?
Enter battery capacity in amp-hours (Ah) and nominal voltage, or derive watt-hours as Ah × V. The calculator applies your usable capacity fraction, then divides usable watt-hours by continuous load watts. Runtime (hours) = (capacity Wh × usable fraction) ÷ load W.
How long will a 12V 100Ah battery run a load?
At 12 V nominal, 100 Ah equals 1,200 Wh nameplate. With the default 90% usable fraction, that yields 1,080 Wh usable. A continuous 200 W load would run about 5.4 hours (1,080 ÷ 200). Enter your own Ah, voltage, load, and usable fraction for your build.
Does inverter efficiency affect runtime?
This calculator uses the continuous load watts you enter. It does not apply a separate inverter efficiency factor. If you are sizing from AC appliance ratings, include conversion losses in your load estimate or use a lower usable capacity fraction to reflect real-world reserve.
Can I calculate runtime for multiple appliances?
The form accepts one continuous load at a time. Add running watts for appliances that operate simultaneously, or run separate calculations for different load scenarios. Surge or startup peaks are not modeled — use running watts, not brief peak ratings.