Kohler Power Systems—Residential and Commercial Standby Generators

Kohler Power Systems broke into manufacturing generators right after World War I to address a growing need for power in rural areas where power lines were scarce, but electricity was needed. Previously, most generators provided enough current to charge a battery bank, but the Kohler Automatic Power & Light power plant supplied 110 volts of electricity and could start automatically when when power was needed and shut itself down when it was not.

Today, Norwall Power Systems sells modern Kohler standby generators for homes and businesses. Their standard 5-year limited warranty is applicable for grid-connected systems, or an 18-month limited warranty for off-grid systems.

RESA Air-Cooled Standby

Automatic Home Standby Generator

Automatic Home Standby Generator

The 14RESAL was rated by consumer reports in their Best Emergency Gear report for providing ample and especially smooth power. It provides up to 14 kilowatts (12 kW running on natural gas) of continuous power while running on propane. A larger 20kW model is also available. The standby generator units are available with or without an automatic transfer switch. With the optional OnCue Remote Monitoring System, you can monitor the generator from any Internet-enabled PC or laptop.

Need to power essentials in an emergency? Check out the 8.5RES with quiet operation and superior power quality.

RESA and RES generators from Kohler meet US EPA and California emissions requirements.

RESA Liquid-Cooled Generators

A 30 Kilowatt liquid-cooled Kohler standby generator

30RESA Liquid Cooled

If air-cooled standby isn’t quite enough, the 30kW RESA liquid-cooled standby generators can provide up to 10 kilowatts more power than their air-cooled siblings. These standby generators use GM 4-cylinder, 1.6 liter engines similar to those found in automobiles with a radiator and fan cooling system. They can run on either propane or natural gas.

These generators have a sound attenuating enclosure that helps keep noise levels near 68dB. The isochronous governor and digital voltage regulation allow the unit to provide exceptionally clean power.

38 Kilowatt and 48 Kilowatt RCL

A Kohler 48 kilowatt standby generator

Kohler 48kW Standby Generator

The RCL standby generators provide power for large residential homes and small businesses with 38 and 48 kilowatts of power. The 4-cylinder, 4.3 liter (38RCL) or 5.0 liter (48RCL) GM engines operate at just 1800 RPMs to extend engine life and reduce noise levels. Both models provide maximum power using either propane or natural gas.

These Kohler standby generators are among the quietest in the industry at 61dB while running at full speed, and 58dB while in exercise mode. That’s the level a normal conversation.


80 kilowatt ERESD liquid cooled standby generator.

80ERESD by Kohler

The next step in available standby power, the liquid-cooled 60 ERESB and 80 ERESD supply 60 kilowatts and 80 kilowatts respectively for large residential homes and small businesses. The GM 5.7 liter Vortec engines (turbocharged in the 80kW) can run on either propane or natural gas and provide full power using either fuel.

Noise levels run at about 64dB and 71dB at 23 feet for friendly operation that won’t keep the neighborhood awake—central air conditioning units make about 70dB of noise.

Kohler 100 ERESD and 125 or 150ERESC

Kohler 150 kilowatt standby generator.

Kohler 150ERESC Standby Generator

For liquid-cooled standby power to meet the needs of the largest luxury homes or larger small business operations, these 100kW, 125kW and 150kW standby generators from Kohler can supply plenty of power for the most demanding circumstances.

The GM engines run on either natural gas or LP gas—the 100kW uses a 5.7 liter engine, the 125 and 150 kilowatt models have 8.8 liter engines. Differences in power for the two fuels are significant: 80kW(NG) versus 100kW(LP) for the 100ERESD and 105kW(LP) versus 125kW(NG) for the 125ERESC. Expect the 150 ERESD to provide 134kW on LP gas, and 144kW on Natural gas.

Variable Speed DC Standby

VSG series generator in 24, 36, and48 volt models.

The VSG series for Off-Grid Applications

Alternative power systems need backup power too. The VSG series generators provide DC current to charge battery banks when power production drops from solar panels or wind turbines. They operate solely on propane (LP gas) and were designed specifically for off-grid homes, telecommunications, and other remote systems where grid power is unavailable.

Different models produce 24, 36, or 48 volts of electricity depending on the voltage requirements of the battery bank and can charge it directly or even supply power directly to the system. When batteries run low or cannot meet demand, the generator starts and runs automatically. The variable engine speed conserves fuel and only produces the current required at any given moment.

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Country Living
Comment by Jim C. on 9th Nov 2014

My Mom and Dad are both in their 80's and live in the country. With the installation of the 6551 I can rest assured that they will never be without power, heat, ac and water. this is a great unit and worked perfectly upon startup. Should have installed this a lot sooner for them.

By the way, my son-in-law also has one for his home. I live in a motorhome or I would have one also.

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