Sizing guide
How to size a solar generator
Sizing starts with the load. List each device, estimate watts, choose a runtime target, and then compare battery capacity and recharge options.
Simple formula
Watts x hours = watt-hours needed. Add margin for inverter losses, weather, battery age, and devices that cycle or surge.
Common loads
- Router: often a low load, but important for communication.
- Refrigerator: may cycle, but startup surge and runtime margin matter.
- CPAP: check the exact model, humidifier use, and manufacturer guidance.
- Laptop and phones: easy loads, but still count them.
Use the app
Ask Backup Power Finder with the devices, target hours, budget, and whether you want solar panels. The app returns fit-ranked products with tradeoffs and affiliate disclosure.