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There can be different generator power output rating depending on if you are using NG or LPG, the former is usually less. Example for the Kohler 24RCLA 24kW Generator the rating single phase 240VAC is 100 amps on LPG and 87 amps on natural gas, the Generac RG02515ANAX 25 KW is not derated (104 amps). The Kohler water cooled motor is an 1800 RPM 2.2L vs. Generac water cooled motor is 3600 RPM 1.5L, where you see a significant difference is the fuel consumption: Kohler on NG is 150 cfh at 50% and 301 cfh at 100%, the Generac is 297 cfh at 50% and 430 cfh at 100%. So under most operating conditions 25-50% load the Generac is consuming about 2X as much fuel on NG. Noise wise the Kohler at full output is 61dBa, the Generac is 72 dBa, each 3 dBa increase is 2X as loud, pretty significant difference. Voltage frequncy and voltage fluctation on the Kohler is typically 1%, Generac is 5%. Kohler 24RCLA weight is 1260 lbs, the Generac RG02515ANAX is 777 lbs, both use aluminum enclosures so assume most of the weight difference is motor/generator. Price difference between the Genrac and the Kohler/Cummins is about $1000 -1400.
Cummings (Onan) 25kW generatoris rated output at single phase 240VAC 105A on NG or LP, has similar specs to the Kohler as far as fuel consumption and noise level. The Generac's tend to use smaller higher RPM motors in their smaller residential generators, so increase noise and fuel consumption, as well as wear. Fuel consumption of the air-cooled motor generators and noise are also higher than the same output water cooled generators, the Generac air-cooled 22kW generator fuel consumption at 50% load is 228cfh and 327 cfh at 100%.
Cummings (Onan) 25kW generatoris rated output at single phase 240VAC 105A on NG or LP, has similar specs to the Kohler as far as fuel consumption and noise level. The Generac's tend to use smaller higher RPM motors in their smaller residential generators, so increase noise and fuel consumption, as well as wear. Fuel consumption of the air-cooled motor generators and noise are also higher than the same output water cooled generators, the Generac air-cooled 22kW generator fuel consumption at 50% load is 228cfh and 327 cfh at 100%.