A report done in New Zealand in 2018 by arranging quotes for houses around the country found many quoted systems had 20+ yr paybacks. https://i.stuff.co.nz/bus

A report done in New Zealand in 2018 by arranging quotes for houses around the country found many quoted systems had 20+ yr paybacks. https://i.stuff.co.nz/business/107335911/solar-power-systems-take-decades-to-pay-for-themselves-consumer-nz-says https://i.stuff.co.nz/business/107335911/solar-power-systems... But on the other hand if a house is ideally suited for solar, the payback will easily be 10 years.