Generators Knowledge Quiz

Typically 5,000-15,000 including the unit, transfer switch, concrete pad, gas line, and electrician labor. Large 20-plus kW units with long gas runs and panel work push toward the top of that range.

A portable unit runs 500-2,500 plus extension cords or a manual transfer switch (300-700), while a standby unit runs 5,000-15,000 installed. Standby starts automatically and runs on your home's fuel; portable needs manual setup each outage.

Unit size in kilowatts, fuel type and the length of the gas line run, transfer switch type, electrical panel work, and the pad and site prep. Buried gas lines and permits add significant cost.

Annual maintenance (oil, filters, battery, and a load test) runs roughly 150-300 per service, plus fuel when it runs and battery replacement every few years. Standby units also need periodic exercise runs to stay reliable.

A manual transfer switch runs 300-700 installed for a few circuits, while an automatic transfer switch for a standby unit is usually bundled but adds roughly 500-1,500 to the package. One is required to safely and legally connect a generator to your home.

When you only need to run a refrigerator, lights, and a few devices during short outages and you are willing to set it up safely outdoors each time. It will not reliably run a well pump, electric heat, or central air.

When outages are frequent or long, or you depend on electric heat, a well pump, medical equipment, or work-from-home. A standby unit restores power automatically without going outside in a storm.

Natural gas means unlimited fuel as long as the line flows, but you depend on the utility and may need a larger gas line or meter. Propane stores on site in a tank and works off-grid, but you must monitor and refill it. Choose based on what is reliable where you live.

Add up the appliances you must run at once: a 5-7 kW portable handles essentials, 10-14 kW covers most homes minus central air, and 18-22-plus kW runs whole homes including large HVAC. Oversizing wastes fuel and undersizing trips breakers.

Generators offer unlimited runtime on fuel and lower upfront cost for whole-home power. Batteries are silent, fuel-free, and pair with solar, but cost 10,000-20,000 or more and last hours to a day. Many homes end up using both.

A licensed electrician for the transfer switch and panel connections, a licensed plumber or gas fitter for the fuel line, and a company familiar with local permits and inspection rules. Confirm who is doing which trade.

Ask about their load calculation, the transfer switch type, who runs and sizes the gas line, pad and setback requirements, noise levels, who pulls permits and schedules inspections, and the warranty on both the unit and the labor.

Often yes, for a single warranty and correct sizing, but compare: buying the unit yourself can save money, yet some installers will not warranty equipment they did not supply. Ask for the pricing both ways.

Verify licenses and insurance, read reviews about installation quality and service response, ask for local references, and confirm they will still be around for annual maintenance, since a generator you cannot service is worthless.

Three, and compare more than unit price: gas line scope, transfer switch, pad, permits, and the labor warranty vary widely between bids for the same model.

Your electrical panel capacity, gas meter size and line capacity (a 20 kW unit may need a bigger meter or line), and which circuits you actually need backed up. A load calculation should be done, not guessed.

Most areas require an electrical permit and inspection for the transfer switch, gas work may need a separate permit, and units have setback and clearance requirements from windows, doors, and property lines.

The manufacturer's warranty, usually 2-5 years or 1,000-2,000 hours, covers the engine and alternator, while labor and installation defects fall under the installer's workmanship warranty. Annual maintenance is typically required to keep it valid.

Confirm the installer performs a load test at commissioning, that the transfer switch is automatic, and that the fuel supply is sized for full load. Run your own test during the annual service too.

An itemized quote covering the unit, transfer switch, gas line, pad, electrical work, and permits, plus warranty certificates, a commissioning and load test report, and the manual with the maintenance schedule.

Running a portable generator indoors, in a garage, or near windows, because carbon monoxide kills quickly and silently. Generators must run outdoors, far from doors and vents, with a CO alarm in the home.

Backfeeding is plugging a generator into a wall outlet to power the house. It can energize utility lines and kill a lineman, it is illegal, and it is a fire hazard. A transfer switch is the only safe way to connect.

Gas line extension (which can run 500-2,000 or more for long or buried runs), a gas meter upgrade, the concrete pad, permits, electrical panel work, and landscaping to meet setback rules. Ask for an all-in quote.

Undersized units that trip on your real load, no load calculation at all, extension-cord hookups instead of a transfer switch, or skipped permits. All of those fail exactly when you need power the most.