I have looked into solar, 30k, repaid after 8 years. It's not bad imo. The only drawback is the liability, I have a friend who did it with his house and squirrels ended up just wrecking his roof, damaged 3 panels and he had water damage as a result of the damage caused on the roof, he had to shell out big money to remove the panels, fix the roof and then replace and have them setup again.