Four years ago I had Kreuser install a stand alone Generac. No problems for all four years. A red light came on just before Dec 24th, 2020 called Kreuser to check it out.
Walter came out Monday the 28th. About an hour later it's running great. Super nice man. Very reasonable price. And I live in ILLinois just over the border.

took generator in for service, did not do anything, would not return generator, sued and won in court, wi court case number
2013SC001450. Sued by suppliers and others, check wi court access, you will see. DO NOT DO BUSINESS WITH