Home battery backup systems, such as the PWRcell by Generac or the Tesla Powerwall, store energy, which you can use to power your house during an outage. Battery backups run on electricity, either from your home solar system or the electrical grid. As a result, they’re much better for the environment than fuel-powered generators.
Separately, if you have a time-of-use utility plan, you can use a battery backup system to save money on your energy bills. Instead of paying high electricity rates during peak usage hours, you can use energy from your battery backup to power your home. In off-peak hours, you can use your electricity as normal — but at a cheaper rate.