Has anyone use Vivint for their solar install? They have designed a system that will produce 90% of the KWH I use at .135 cents with 2.9% increase each year. The sales rep estimated my electric company will raise at 5% or more most years, and I am at over .18 cents now. My roof is 8 years old, and the 20 year contract with the $500 fee/procedure to take the system off for roof replacement concerns me. Also, I am concerned with the production during the winter months and summer months. Should I expect the system to produce 90% year around, or less in the winter and more in the summer? If it produces more in the summer, does the over produced amount get credited to my account for the winter months at the same rate I paid for it? Is it possible that the system will produce 90% in the winter, and over 100% in the summer? Does this mean I could be paying Vivint for power I can't use? Thanks for any help.