Standby generator installation

How a standby system works

Three pieces work together. The generator, an engine and alternator in a weather-resistant enclosure, sits on a pad outdoors. A fuel line connects it to the gas meter or a propane tank. An automatic transfer switch at the panel monitors utility power. When the grid fails, the switch signals the generator to start, waits until the power is steady and then moves your circuits over. When utility power returns, it moves them back and the generator cools down and stops.

Between outages, the generator runs a short exercise cycle on a schedule to keep itself ready and logs any problems. Many models report their status to a phone app.

What a complete quote includes

A proper quote covers more than the generator. Look for each of these items:

• Generator model and kilowatt rating, sized from a load calculation
• Transfer switch type and amperage
• Pad or base, including any leveling on a slope
• Fuel connection to gas or propane, with any meter upgrade
• Electrical work from the generator to the switch and panel
• Permits and inspection, filed and scheduled by the installer
• Start-up and walkthrough, plus warranty registration

Sloped lots in the Rivertowns

In Dobbs Ferry, Hastings-on-Hudson, Irvington and Tarrytown, many houses are built into hillsides, with the street on one level and the yard on another. The generator has to sit on level ground with clearance from windows, doors and vents, and within village setback and noise rules. Sometimes that means a built-up base or a longer run back to the panel and meter. Ask the installer to explain why they picked the spot they did and what it adds to the cost.

Older homes and wiring

Victorian and early 20th century houses often have electrical systems that were updated piece by piece. The installer will want to see the main panel, the service size and the grounding before committing to a plan. Sometimes the right move is a panel upgrade first. Read our panel upgrade page for more on that.

After installation

Keep the area around the generator clear of plants, mulch, leaves and snow. Keep carbon monoxide alarms working on every level of the house. Watch for warnings on the controller or app and call the installer about any fault. Plan on a service visit about once a year. See generator maintenance for what that visit covers.

Questions people ask before buying

Will it be loud? Most units are noticeable during the weekly exercise but quieter than a portable generator, and placement plus local rules keep the sound reasonable. Will it look out of place? Enclosures are compact and can often be screened with low plantings that still leave the required clearance. What happens if I am away? Nothing changes. The transfer switch and generator handle the outage on their own, and many models send an alert to your phone so you know the house has backup power.

Questions homeowners ask