I was recently without power for three days following Hurricane Michael. In Jan. 2017, I was without power for seven days as a result of a tornado. I have decided that I need a standby whole house generator. It looks like I will need a 20KW unit. I am looking at three different brands, Briggs and Stratton, Cummins and Kohler. All three are powered by air cooled big block V-Twin engines. Anyone out there have any of the brands I listed and how well do you like them?