I have 3 PW's in the basement and on 2 occasions Tesla has come out and said, after many months, that the roof sag between beams won't allow them to install the panels. There is no structural problem to the roof. The house is a 1928 and roof is about 10 years old. I want to be able to use the PW's as a generator in case of power outage and as is, only lasts about 24 hours. Is there another solar company that will install and connect to the PW's? SunRun has refused.