16.92 years ROE for a $20 monthly bill reduced from $400 per his account. Many of the cells in his electricity generation system will be gone before that (most of them anyway)...battery replacements, DC/AC conversion system, control system....somebody sold him a bill of goods.
Additionally, they installed this stuff directly over a membrane roof. I’m guessing which will develop stress leaks long before that. I cringe when I look at it.
Nope. He has panels and sells worthless off-peak power to the grid at full price when he has sun and no failures (probably spins the meter backwards). Then at peak period in the evening he draws from the grid at the same price, except that is peak power and costs more. If he actually stored his power in batteries that would be commendable but none of those jerks do that, they just scam the other ratepayers and feel smug about it.