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Have had my system over 5 years. Residential solar systems are not very common in East Tennessee due to the low electric rates here. Takes forever to get to your break even point. But lately my biggest concern is getting an installer/contractor to service my system. Solar systems not being popular means a lack of installers and maintenance service. Had hoped to add more panels and eventually a battery backup. But until solar picks up here, I'm out of luck. Regards, Bert H.