Generac 18kW Standby 7324 vs Kohler 20RCAL 20kW

Last updated: November 1, 2026

The Generac 18kW Standby 7324 is the better standby generator overall, rated 3.2 to 2.9. The Generac 18kW Standby 7324 leads on noise. The Generac 18kW Standby 7324 costs $872.90 less ($5,975.10 vs $6,848).

Generac 18kW Standby 7324 vs Kohler 20RCAL 20kW

Prices were last checked November 1, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.

Which should you buy?

Scores side by side

Each factor is scored 0-100 against the same fixed reference points for every 15 to 22 kw standby generator; a clear win is highlighted. How we rank explains each one.

Factor weightGenerac 18kW Standby 7324Kohler 20RCAL 20kW
Overall rating3.2/52.9/5
Value 35%29 $332 per kW ($5,975 with transfer switch, 18 kW on propane)24 $342 per kW ($6,848 with transfer switch, 20 kW on propane)
Transfer switch 15%100 includes a 200 A transfer switch100 includes a 200 A transfer switch
Noise 15%58 65 dBA rated in normal operation17 70 dBA rated in normal operation
Power quality 10%83 under 5% THD83 under 5% THD
Warranty 25%29 5-year warranty29 5-year warranty

Specifications

Generac 18kW Standby 7324Kohler 20RCAL 20kW
Output
Rated output, propane18 kW20 kW
Rated output, natural gas17 kW18 kW
THDUnder 5%Under 5%
Engine817 cc999 cc
Engine speed3,600 rpm3,600 rpm
Install
Transfer switchIncluded, 200 AIncluded, 200 A
Load managementNoYes
Remote monitoringYesYes
EnclosureAluminumAluminum
Dimensions46.4 x 26.3 x 30.7 in47 x 26.0 x 32.3 in
Weight426 lb600 lb
Noise and warranty
Noise, normal operation65 dBA70 dBA
Noise, weekly self-test55 dBA66 dBA
Warranty5 years5 years
Released2025-

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