A standby generator installs permanently outside the home, wired through an automatic transfer switch, and kicks in within seconds of a power outage without any manual setup — the right choice between the two dominant brands comes down to dealer network versus build-quality priorities.
Generac Guardian Series (10-26 kW)
Most reviewers pick Generac as “best overall” for standby generators — it is the most widely installed brand in the US, with roughly 8 out of 10 home standby units running Generac equipment, backed by the largest dealer and service network in the industry. The lineup spans 10, 14, 18, 22, 24, and 26 kW sizes with a 5-year limited warranty plus cellular and Wi-Fi remote monitoring built in.
Kohler 20RESCL Standby Generator
Praised for build quality, Kohler’s RCA-series units are considered among the best-built air-cooled standby generators, with heavier enclosures and cleaner wiring than competitors. The 20RESCL specifically activates within 10 seconds of a power outage and includes a 200-amp whole-house transfer switch with corrosion-proof construction.
Kohler RCA Liquid-Cooled Series
For buyers with a larger budget, Kohler’s premium liquid-cooled generators run at a slower 1800 RPM, which gives quieter operation and longer service life compared to the standard air-cooled units from either brand.
Choose Generac for the widest dealer network, more size options, and the deepest service infrastructure if something needs repair. Choose Kohler if you prioritize build quality, corrosion resistance, and quieter liquid-cooled operation and have the budget for it.
Briggs & Stratton Fortress Standby Generator Series
Briggs & Stratton’s Fortress line (10-20 kW) positions itself as a third major option alongside Generac and Kohler, built around the company’s long history in small engines. It includes a mobile app for remote monitoring and self-diagnostics, and tends to price slightly below Kohler’s equivalent sizes while still offering a comparable multi-year limited warranty.
Champion 14kW Home Standby Generator
Champion’s standby lineup undercuts Generac and Kohler on price at similar kW ratings, making it a reasonable option for budget-conscious buyers who still want automatic transfer switch functionality and remote monitoring. The tradeoff reviewers note is a smaller nationwide dealer network for installation and warranty service compared to the two market leaders.
What installation actually costs and requires
The generator unit itself is often only half the total project cost — installation (electrician labor, the automatic transfer switch, a concrete pad, gas line work if running on natural gas, and permits) commonly adds $3,000-$6,000 or more depending on your local labor rates and how far the unit sits from your gas meter and electrical panel. Most municipalities require a permit and inspection for standby generator installation since it involves gas line and electrical panel work, and skipping that step can cause problems with homeowners insurance or resale disclosure later. Sizing is the other big decision: a “whole-home” generator sized to run central AC and an electric range costs significantly more than a “managed” system sized to cover essential circuits only (fridge, well pump, some outlets, furnace blower) through a load-management transfer switch that prioritizes which circuits get power first.
Frequently Asked Questions
How much does a standby generator cost installed, not just the unit price?
Total installed cost for a mid-size (14-22 kW) standby generator commonly runs $6,000-$12,000+ including the unit, transfer switch, pad, gas line, and electrician labor — regional labor costs and site complexity (distance from gas meter, panel accessibility) cause significant variation, so get at least two local quotes rather than budgeting off the unit price alone.
Does a standby generator need regular professional maintenance?
Yes — most manufacturers recommend annual professional service (oil change, filter checks, battery test, load test) similar to a furnace tune-up, and many dealers sell maintenance contracts for this. Skipping annual service is one of the most common reasons a standby generator fails to start during an actual outage, since the battery that triggers automatic start can quietly die between uses without regular testing.
Can I run a standby generator on propane instead of natural gas?
Most standby generators, including the Generac Guardian, Kohler RCA, and Briggs & Stratton Fortress lines, are dual-fuel capable and can run on either natural gas or LP (propane) with the correct regulator setup, though output is typically a bit lower on propane. Confirm which fuel your specific model ships configured for, since switching fuel types after installation sometimes requires a technician to adjust the regulator and carburetor jets.
How long does a standby generator last before it needs replacement?
With proper annual maintenance, most air-cooled standby generators are rated for roughly 25-45 years of calendar life, though actual engine hours of continuous run-time (the more relevant wear metric) matter more than age alone — a unit that’s only run during brief monthly self-tests and occasional short outages will typically outlast one used for extended multi-day runs every year. Liquid-cooled units, built for higher duty cycles, generally have an even longer expected service life than air-cooled models at a comparable kW rating.
Do I need a separate battery backup if I already have a standby generator?
Not usually — standby generators start automatically within 10-30 seconds of an outage, so the small gap before it kicks in is the main window where a battery backup (like a UPS on critical electronics) adds value, mainly to prevent abrupt shutdowns on computers or medical equipment during that brief transition. For most households, the standby generator alone covers the outage once it’s running.
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