Transfer Switch
An electrical device that switches a home between utility grid power and backup power (generator or battery). Prevents backfeed that could endanger utility workers.
Why It Matters
A transfer switch is required for any backup power system. Automatic transfer switches (ATS) activate within seconds of detecting an outage.
Related Tools
Related Terms
Backup Generator
A standby or portable engine-driven generator that produces electricity during power outages, typically fueled by natural gas, propane, or gasoline. Rated in watts (e.g. 7,500W portable, 22,000W whole-home).
Whole-Home Backup
A battery system sized to power an entire home during a grid outage, as opposed to backing up only essential/critical loads. Typically requires 2-4 batteries (30-50+ kWh).
Islanding
The ability of a solar + battery system to disconnect from the grid and operate independently, powering the home from stored and locally generated energy during an outage.