I'm partial to the Cummins and Kohler units, they are simpler, tried and true technology. The Generac has their newest model, the 24KW, which is an uprated version of their 22KW. The cummins and Kohler have stuck with 20KW ratings. MOST people I work with are getting the 24KW Generac because "bigger is better".
To be clear, I don't sell generators so I don't have a dog in the hunt, but I connect a LOT of them and work with companies that do sell them, and homeowners that use them. My first choice is Cummins because they have the deepest background (my opinion) in generators (think boats, RV, etc.).
Another thing to be mindful of is Air Cooled versus Liquid Cooled. The air cooled models are essentially large lawn mower engines running at 3600 RPM. Water cooled models all run at 1800 RPM. Remember the 60 hertz frequency? All generators have to run at an RPM divisible by 60 to get the 60 hertz output sine wave.
So air cooled units are MUCH noisier and don't last as long (due to lighter duty engine components and higher running RPM's). Water cooled units are MUCH quieter and last much longer (think small car engine), but they are generally TWICE as expensive. The air cooled units will last most of us a VERY long time if maintained well.
FYI, don't install an air cooled unit near your bedroom, put it on the opposite side of the house near your neighbor's bedroom, especially if he's a CU fan.
To be clear, I don't sell generators so I don't have a dog in the hunt, but I connect a LOT of them and work with companies that do sell them, and homeowners that use them. My first choice is Cummins because they have the deepest background (my opinion) in generators (think boats, RV, etc.).
Another thing to be mindful of is Air Cooled versus Liquid Cooled. The air cooled models are essentially large lawn mower engines running at 3600 RPM. Water cooled models all run at 1800 RPM. Remember the 60 hertz frequency? All generators have to run at an RPM divisible by 60 to get the 60 hertz output sine wave.
So air cooled units are MUCH noisier and don't last as long (due to lighter duty engine components and higher running RPM's). Water cooled units are MUCH quieter and last much longer (think small car engine), but they are generally TWICE as expensive. The air cooled units will last most of us a VERY long time if maintained well.
FYI, don't install an air cooled unit near your bedroom, put it on the opposite side of the house near your neighbor's bedroom, especially if he's a CU fan.