Edition 02 · Field notes
Bench Runtime
Hours from a 12-volt pack, after inverter loss.
KT
02
Field notes for sizing a lithium pack against a real load. Watt-hours, inverter efficiency, and the reasons a label lies. The sample calculator is free. The file is the worksheet and the caveats.
Amp-hours are not hours. The notes walk watt-hours, inverter loss, and a 50 amp-hour pack against a 120 watt load.
In the file
- Watt-hour worksheet
- Inverter efficiency, including idle draw
- A 50Ah / 120W worked example
- What not to trust on a device label
Try a piece
The calculator is free. The file covers idle draw, BMS cutoff, and why the label is not a measurement.
- Usable watt-hours
- 510
- Runtime
- 4h 15m