How it Works

This is how a permanent stand-by generator system works:

The completely automatic Generac transfer switch monitors incoming voltage from the utility line – around the clock.
When utility power is interrupted, the automatic transfer switch immediately senses the problem and signals the generator to start.
Once the generator is running at proper speed, the automatic transfer switch safely closes off the utility line and simultaneously opens a new power line from the generator.
Within seconds, your Generac generator system begins supplying electricity to the critical emergency circuits of your home or business. The transfer switch continues to monitor the utility line conditions.
When the automatic transfer switch senses the utility line voltage has returned at a steady state, it re-transfers the electrical load back to the utility line and resumes monitoring for subsequent utility loss. The generator will continue to run for an engine cool-down period of several minutes while the entire system stands ready for the next power outage.
To ensure the system is always ready when you need it, your generator will run a 10-12 minute self-test cycle every week.

For further information on how stand-by generators work, visit