Planning tool
Backup Power Planner
Match battery capacity to your devices. Wh = watts × hours, with efficiency losses applied once. Not a medical-device certification or electrical design tool.
Raw energy need
32 Wh
With ~15% losses:
38 Wh
Look for a station with at least this capacity. Check the continuous watt rating for any appliance with a motor (fridge).
Your data is saved only in this browser (localStorage). No account needed. This tool supports planning — it is not a real-time emergency decision aid. In an emergency, call 911.