You can do your own solar install for about $1.50/W in the US - ground mount or roof, doesn't really matter (the cost of the per panel electronics for NEC 2017

You can do your own solar install for about $1.50/W in the US - ground mount or roof, doesn't really matter (the cost of the per panel electronics for NEC 2017 and later rapid shutdown requirements are about the same as the cost of a ground mount). It's a lot of work, but can make sense, even in low power cost areas.