re: #65 LudwigVanQuixote

As to paying for themselves in 20 years, there are a lot of variables in such a calculation. Not every home is a good candidate for becoming solar. This is partially due to architecture and partially due to location and orientation of the roof.

The insolation in Portland would not make PV’s a good idea, I would think. Passive solar for heating is probably a good idea, though, if it can be done without adding much cost to a house.