Home battery backup
Build your backup plan around the home and the devices that matter.
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How to size home battery backup
Start with what must keep running during an outage, such as the refrigerator, lights, internet, medical devices or a well pump, and for how many hours. Battery capacity (kWh) sets how long; continuous output (kW) sets how much can run at once; surge output matters for motors such as pumps and compressors.
Then decide how it connects: plug-in loads through the station’s outlets, or selected home circuits through transfer equipment installed by a licensed electrician. Solar panels can recharge the battery during longer outages.
- The loads and hours you need to cover.
- Capacity (kWh), and whether you can add expansion batteries later.
- Continuous and surge output (W) against your largest motor loads.
- 120 V only, or 120/240 V for well pumps, central air or other 240 V loads.
- How it connects to your home and who will install it.
Choose with more clarity.
How do I choose home battery backup?
Start with the loads you want to keep running, the outage duration and how the system will connect to the home. Review energy, continuous output, motor starting and transfer equipment separately. A starter configuration does not establish whole-home coverage.
Can I use an existing solar system?
Compatibility depends on the inverter, wiring, transfer equipment and system configuration. Have those details reviewed before selecting a connection. The equipment images do not verify compatibility with an existing installation.
Can a solar generator power a house?
It depends on the loads and on how it connects. A portable station with panels powers the devices plugged into it. To feed home circuits, a system needs transfer equipment installed by a licensed electrician, and its output and capacity must match the circuits you choose. Solar panels recharge the battery when there is sun; they do not set how much power the system delivers.
How long will a home battery last in an outage?
It depends on the loads and hours, not on the battery alone. Divide usable capacity by the average power of what stays on: 6 kWh running an average of 500 W lasts about 12 hours before conversion losses. The calculator does this with your devices.
Which battery do I need?
Choose what you want to keep on and for how many days. The calculator balances your usage hour by hour against the battery, the sun or a generator, at today’s prices.