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Large Generators
Large Generators for Homes, Farms, and Businesses
When a typical portable unit is not enough, you need serious capacity. J.D. Power reports that 45 percent of utility customers nationwide experienced a power outage in the first half of 2025, and for a farm, shop, or clinic every hour offline costs money. Our large generators collection covers permanent standby units, industrial diesel sets, and mobile trailers, ranging from 13kW for a big house to 200kW for a working operation. Every unit here is built for heavy use, with the single-phase and three-phase options that real-world loads require.
Largest Generator Options From 100kW to 200kW
If you are looking for the largest generator we carry, start with the Cummins agricultural diesel series. The C100D6C, C125D6D, C150D6D, C175D6D, and C200D6D deliver 100kW to 200kW of 120/240V single-phase power, which suits barns, grain operations, and large facilities. The Wildcat Roughneck 100kW diesel and the Cummins C100D6C standby unit are available with fuel tank options, and the Wildcat Patriot mobile diesel generator scales from 15kW to 150kW on a trailer you can tow where it is needed.
Large Generator for Home and Small Business Backup
A large generator for a big house or storefront usually falls between 17kW and 30kW. The Cummins Quiet Connect RS17A, RS20AC, RS25, and RS30 run on natural gas or liquid propane, and the Briggs and Stratton 20kW, 25kW, and 26kW PowerProtect DX units offer another trusted option. Prefer diesel? The Cummins C20D6, C30D6, and C50D6 start automatically, and the Maspower line with Yanmar engines runs from 13kW to 45kW with tank sizes up to 200 gallons.
Diesel, Natural Gas, and Propane Power Plants
The Wildcat Roughneck series covers diesel from 30kW to 100kW and natural gas or propane at 30kW and 60kW, with sound-attenuated enclosures, open skid versions, and optional UL142A fuel tanks. The Wildcat Freedom and Renegade 15kW units run on diesel, natural gas, or propane, and the Frontier 15kW is available for propane. The Kubota GL14000 LowboyPro delivers industrial reliability in a compact footprint, and a sound upgrade kit is available for Cummins Quiet Connect units. Every order ships free within the continental USA, and our USA-based experts can match a model to your load and voltage.
Frequently Asked Questions
Do I need a single-phase or a three-phase generator?
Match the generator to the service you already have. Most homes and many farms use single-phase 120/240V, while commercial buildings, shops, and industrial equipment often run on three-phase power at 208V, 240V, or 480V. Check your utility panel or equipment nameplates, and note that some single-phase configurations are derated, so confirm the usable kW before you order.
How do I size a large generator for my property?
List every load you need to power and note the starting amps of motors such as pumps, compressors, and HVAC units, since those surge well above their running draw. Add them together, then include 20 to 25 percent headroom for future growth. An electrician or our team can run the numbers and confirm both the kW rating and the voltage.
What does installing a large standby generator involve?
Expect a level pad, an automatic transfer switch sized to your service, a fuel supply, and permits from your local authority. Natural gas and propane models need a licensed gas fitter, and diesel units may need an approved double-wall tank that meets local code. A licensed electrician should handle the connections, and an inspection is usually required before you can run the unit.
What is an on-board load bank and do I need one?
A load bank is a resistive device that puts an artificial load on a generator so it runs at a healthy output. Diesel engines that run lightly for long periods can build up unburned fuel in the exhaust system, which a load bank helps prevent. It is mainly useful for mobile or standby diesel units that rarely carry full load, and the Wildcat Patriot offers it as an option.
How are large generators shipped?
Units of this size ship by freight on a pallet or skid, and overnight shipping is not available for generators. Plan for a liftgate or forklift at delivery, and ask about lead times on larger diesel units. Ordering early, especially ahead of storm season, leaves time for delivery, site prep, and installation.
