The watcher: your transfer switch
An automatic transfer switch (ATS) sits between your utility meter and your electrical panel, monitoring your power 24/7. It's always asking one question: is utility power normal? The instant the answer is no — an outage, or even a severe brownout — the sequence starts. You don't touch anything. Most people are still reaching for their phone flashlight.
Seconds 1–10: the start sequence
The transfer switch signals the generator to start. The engine cranks (on its own battery, which is why battery maintenance matters), warms up for a few seconds, and reaches stable speed and voltage. The switch then disconnects your home from the dead utility line — this is critical, because it prevents your generator from backfeeding power onto the grid, which can injure lineworkers — and connects your panel to the generator. Lights on.
During the outage: steady power
The generator runs at a constant speed, adjusting fuel to match your home's changing load as the AC cycles, the well pump kicks on, the fridge runs. If you have load management, the system sheds lower-priority loads (like the electric dryer) when demand spikes, then brings them back. It'll run as long as it has fuel — hours, days, whatever the outage brings.
Power returns: the handoff
When the transfer switch senses stable utility power for a set period (usually a few minutes, to make sure it's not a flicker), it switches your home back to the grid and lets the generator cool down before shutting it off. The whole return is seamless — you might notice the lights blink once.
The weekly self-test
Standby generators exercise themselves — typically 5–15 minutes once a week, on a schedule you set. This keeps the engine lubricated, charges the battery, and confirms it'll start when needed. If something's wrong, newer units can alert you. It's the reason standby generators are ready after sitting idle for months — they're never truly idle.