Outage planning tool
How many watt-hours do you need for an outage?
Use this quick planner for routers, lights, phone charging, and other small loads. For appliances with surge loads or medical equipment, verify requirements with the device manual and a qualified professional where appropriate.
Editable estimate
Watt-hour outage planner
Estimate battery capacity for small outage loads. This is a planning helper, not a guarantee; real runtime depends on device draw, inverter losses, temperature, and battery age.
Estimate
225 Wh
Includes an 80% usable-capacity assumption. Raw load estimate: 180 Wh.
Estimated runtime at that load: 5.1 hours