Question 1

Why do I need a transfer switch?

Accepted Answer

It's required by code and safety. Without one, generator power can backfeed the utility lines and electrocute linemen — plus it can destroy your generator when utility power returns.

Question 2

Manual or automatic transfer switch?

Accepted Answer

Manual works for portable generators — you flip it during an outage. Automatic (ATS) works with standby generators and switches within seconds without you being home.

Question 3

How many circuits should a manual transfer switch handle?

Accepted Answer

Most homeowners pick 6–10 essential circuits: fridge, furnace, sump pump, some lighting, and outlets. 12-circuit switches cover most needs.

Question 4

Can a transfer switch power my whole house?

Accepted Answer

With a large enough generator and a service-entrance-rated ATS, yes. Most 22kW+ standby generators run whole-home ATS setups without load shedding.

Question 5

How much does transfer switch installation cost?

Accepted Answer

Manual 10-circuit installs typically run $1,200–$2,000. Whole-home ATS runs $2,500–$5,000 depending on service size and location.

Question 6

Where does the transfer switch get installed?

Accepted Answer

Manual switches mount next to the main panel. ATS units mount between the meter and main panel (service-entrance) or as a subpanel branch.

Question 7

Do I need a permit for a transfer switch?

Accepted Answer

Yes in every DMV jurisdiction. It's a life-safety device and inspection is mandatory.

Question 8

Can I use a transfer switch with solar or battery?

Accepted Answer

Yes, but the interlock logic is more complex. We coordinate ATS operation with hybrid inverters and battery systems like Tesla Powerwall or Enphase.

Question 9

How long does installation take?

Accepted Answer

Manual switch installs are typically 4–6 hours. Whole-home ATS installs are one full day including utility coordination.

Question 10

What's the difference between an ATS and an interlock kit?

Accepted Answer

An interlock is a mechanical device on the main panel that prevents both main and generator breakers from being on simultaneously. It's cheaper but requires manual operation and works only with portable generators.

Transfer Switch Installation

What's included

Our process