Been following this thread and have to comment..... Sixteen years ago I paid $100 for a used 8kw Generac NG/Propane standby genset. It has a Briggs and Stratton vertical shaft V-twin engine. Had to buy new the Generac transfer switch for it which cost $250 so it would work like it should. Keep in mind this unit was used...no clue how many hours were on it when I bought it and it is still going strong. When Katrina came through it ran basically nonstop for a little over month and I'm 190 miles from the gulf coast. I would shut it down every morning to check the oil and fire it right back up. I slept cool, lost no food, was able to make ice for others, let family and friends come shower be cool as well.
We had severe storms just last night. Power went out a little after 5 p.m. and to my knowledge still hasn't been restored and old generac 8k was out there genning when I went home for lunch to check it......Will I do another standby genset if I were to build another house or move to another house?? YOU DURN TOOTIN I WOULD!!!! Only it will be a whole house unit with transfer switch and it'll worth every penny no matter how much or how little its needed.
Two cranking batteries, one starter drive, three sets of spark plugs and yearly oil changes. NG/Propane burn ultra clean. I could probably get away changing the oil every two years.
Just my 2 cents worth