Home generator installation

The parts of a standby system

The generator is an engine and alternator in a weatherproof enclosure. It sits on a pad or base a set distance from the house. A fuel line runs to it from your gas meter or from a propane tank. An automatic transfer switch, mounted near your panel or meter, tells it when to start and moves your circuits over.

A control board inside the generator runs a short exercise cycle on a schedule and logs any faults. Many models connect to Wi-Fi or a cellular module so you can check on them from your phone.

Brands and models differ in noise, fuel use, warranty and controller features, so ask the installer why they recommend a particular one for your house.

Step by step

Most projects follow the same path, though timing depends on equipment and permits.

• Site visit to look at the panel, fuel supply and possible spots for the unit
• Load calculation to decide what the generator needs to run
• Written quote listing the generator, switch, pad, fuel work and permits
• Permits filed by the installer with the village or town
• Utility coordination if the gas meter needs an upgrade
• Installation day, usually one or two days on site
• Inspection and start-up, with a walkthrough of the controls

Fitting a generator on an Ossining lot

Village lots are often narrow and steep, with houses set close to the property line. Manufacturers require space around the unit for airflow and exhaust, and the village adds setback and noise rules. Sometimes the only spot that works is at the back of the house, far from the panel, which adds wire and fuel run. On sloped yards, the installer may need to build up a level base.

Town lots are often roomier, but tree roots, rock and long distances can still shape the plan. A good installer will show you the options and explain why one spot is better than another.

Getting comparable quotes

Ask each installer to spell out the generator brand and kilowatt rating, the transfer switch type and amperage, the pad, the gas or propane work, and who pulls permits. Ask about warranty registration and who handles service. When one quote is much lower, look for what it leaves out. Gas meter upgrades and permit fees are the most common gaps.

It also helps to ask how long the installer has been working with the brand they recommend and whether they stock common parts.

Before and after the install

Before work starts, mark any underground lines you know about, such as irrigation or a buried propane line, and clear the area where the unit will sit. After it is in, keep plants, mulch and snow away from the enclosure, and keep working carbon monoxide alarms on every level of the house. Book the first service visit for about a year out, or sooner if the generator runs for a long stretch.

Questions homeowners ask