Generator
Transfer Switches
The transfer switch is what makes your generator automatic. Without one, you're running extension cords — which is dangerous and illegal. Double A installs Generac-approved transfer switches for whole-home and select-circuit applications throughout Northeast Florida.
What Happens When the Power Goes Out
Utility Power Fails
The ATS continuously monitors incoming utility voltage. The moment it detects a power failure or voltage drop below threshold, it initiates the start sequence.
Generator Starts
The ATS sends a start signal to the generator. The engine cranks, starts, and reaches stable operating speed and voltage — typically within 10–20 seconds.
Load Transfers
Once the generator reaches stable output, the ATS opens the utility connection and closes the generator connection — transferring your home's electrical load to generator power.
Utility Restores
When utility power returns and stabilizes, the ATS transfers the load back to utility power, signals the generator to cool down, and shuts it off automatically.
Which Transfer Switch Is Right for You?
Automatic Transfer Switch (ATS)
The standard for standby generator installations. Monitors utility power continuously and automatically starts the generator and transfers the load within seconds of an outage — no manual action required.
- Fully automatic — no action needed
- Transfers load in 10–30 seconds
- Monitors utility power 24/7
- Required for whole-home standby systems
- Available in 100A, 200A, and larger
Manual Transfer Switch (MTS)
A lower-cost option that requires you to manually flip the switch to transfer power from utility to generator. Suitable for smaller generators or select-circuit applications where automation is not required.
- Lower upfront cost
- Simple and reliable
- Good for select-circuit setups
- No electronics to fail
- Suitable for smaller generators
Load Management Module
An add-on to an ATS that intelligently manages which loads are powered based on generator capacity. Allows a smaller generator to power more circuits by shedding non-critical loads during peak demand.
- Maximizes generator capacity
- Prevents overloading
- Allows smaller generator to do more
- Automatic load shedding & restoration
- Ideal for 10–18 kW generators
Never connect a generator directly to your home's wiring without a transfer switch. Back-feeding utility lines is illegal and can electrocute utility workers restoring power in your neighborhood. All Double A generator installations include a properly permitted transfer switch.
The Right Team for Transfer Switch Work
Generac Authorized
We install Generac-approved transfer switches that are matched to your specific generator model — ensuring compatibility and preserving your factory warranty.
Licensed Electricians
Transfer switch installation is electrical work that requires a licensed contractor. Double A is a licensed electrical contractor in St. Johns, Flagler, and Duval County.
All Permits Handled
We pull all required electrical permits and schedule inspections on your behalf. You don't have to navigate the permitting process — we handle it from start to finish.
Whole-Home or Select Circuits
Whether you want whole-home coverage or just want to protect critical circuits (HVAC, refrigerator, medical equipment), we size and install the right transfer switch for your needs.
What Our Customers Are Saying
"Double A upgraded our old manual transfer switch to a Generac ATS. The difference is night and day — when the power went out during a storm, the generator kicked on automatically and we didn't even notice. Professional installation, all permits pulled."
Robert A.
St. Johns, FL
"We had a generator but no transfer switch — we were using extension cords, which I know is dangerous. Double A installed a proper ATS and wired it to our panel. Now everything is safe, legal, and automatic. Should have done it years ago."
Susan T.
Jacksonville, FL
"The load management module they recommended was a game-changer. Our 18kW generator now handles the whole house without overloading. Double A explained everything clearly and the installation was clean and professional."
Michael C.
Palm Coast, FL
Transfer Switch Questions
What is an automatic transfer switch (ATS)?
An automatic transfer switch (ATS) is an electrical device that monitors your utility power supply and automatically switches your home's electrical load to your standby generator when an outage is detected. It also transfers the load back to utility power when it is restored and shuts the generator down. An ATS is required for any automatic standby generator installation.
Do I need a transfer switch to use a standby generator?
Yes. A transfer switch is required by the National Electrical Code (NEC) for any generator that is connected to your home's electrical system. It prevents back-feeding — a dangerous condition where generator power flows back into the utility lines, creating a hazard for utility workers. Never connect a generator directly to your home's wiring without a proper transfer switch.
What size transfer switch do I need?
The transfer switch must be sized to match your electrical panel and generator. Most residential installations use a 200-amp ATS for whole-home coverage. Homes with larger panels or commercial applications may require larger units. Double A performs a load assessment to specify the correct transfer switch for your installation.
Can I add a transfer switch to an existing generator?
Yes. If you have a standby generator that is currently connected with a manual transfer switch or an older ATS, we can upgrade it to a modern automatic transfer switch. We can also add a load management module to help a smaller generator handle more circuits.
How long does transfer switch installation take?
A standard ATS installation typically takes 4–8 hours for a residential whole-home system. This includes mounting the switch, connecting it to your electrical panel, wiring to the generator, and testing the complete system. We handle all permits and inspections.
Is a transfer switch installation permitted in Florida?
Yes — and it is required. Transfer switch installations require an electrical permit in Florida. Double A handles all permitting and inspections as part of every installation. Never hire a contractor who skips the permit process for electrical work.
More Generator Services
Make Your Generator Truly Automatic
Call Double A to schedule your transfer switch installation. We serve St. Johns, Flagler, and Duval County — licensed, permitted, and done right.