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Most battery questions we get on the engineer line start with the wrong number: the whole house. Backup is about the circuits you would miss in the first hour of an outage, not the dryer you can run tomorrow.
Start with a short list
Fridge and freezer, lights, Wi-Fi, the furnace blower or a heat pump, a few sockets for phones and a laptop. On most homes that list draws between 600 W and 1.5 kW on average.
Turn watts into hours
- Essentials only: about 8–10 kWh carries an evening and a night.
- Essentials + heating or cooling: 13.5 kWh is the usual answer.
- Whole-home feel: two Keeper modules stacked, or a 13.5 kWh unit plus a 5 kWh module.
Leave room to grow
The Keeper battery stacks later, so buy for the list you have today. The inverter you choose matters more: a battery-ready hybrid lets you add storage without rewiring.
Send us your panel schedule and we will mark the backup circuits on your wiring diagram before you order.
