Standby Generators — Whole-Home, Estate & Commercial Backup Power

A standby generator is the only backup power solution that works when you're not home. Permanently installed and connected through an automatic transfer switch, it detects a utility outage, starts itself, and restores power to your home or facility in under 30 seconds — no extension cords, no refueling in the dark, no manual intervention.

This collection covers the full output range. Air-cooled units from 10 kW to 26 kW handle essentials-only to true whole-home coverage for houses up to roughly 4,000 square feet, running on natural gas or propane with no on-site fuel tank required when utility gas is available. Liquid-cooled standby generators from 30 kW to 150 kW step up to estates, 400-amp services, agricultural operations, and light commercial buildings, with single-phase and three-phase configurations and diesel options for maximum runtime and load response.

We stock the brands that dominate the category: Generac Guardian and Protector series, Cummins Quiet Connect RS line, Briggs & Stratton PowerProtect and Fortress, and Kohler. Every unit ships freight with liftgate options, and our team sizes systems daily — send us your panel schedule or circuit list and we'll match the generator, the automatic transfer switch, and the fuel setup in one quote.

Not sure what size you need? As a rule of thumb: 10–14 kW covers essentials like the refrigerator, furnace blower, sump pump, and lights; 18–22 kW runs most whole homes including one central air conditioner with load management; 24–26 kW handles larger homes with multiple big loads; 50 kW and above covers estates and commercial facilities. Our Whole-Home Generator Sizing Guide walks through the full calculation with a worksheet and fuel-consumption tables.

Pair any generator here with a service-entrance-rated automatic transfer switch from our transfer switch collection for a code-compliant, fully automatic installation.