> (~80 vs ~25) The most efficient panels are at 22% right now, and that's with no overcast conditions or rain, sun directly overhead, and full tracking. The 22

> (~80 vs ~25) The most efficient panels are at 22% right now, and that's with no overcast conditions or rain, sun directly overhead, and full tracking. The 22% are significantly more expensive. Most panels have around 15% efficiency, when new, under ideal seasonal, weather, tracking and lighting conditions. Quite a bit less when not. I have a self built solar water heater and a house designed around passive solar. This handles heating and cooling sufficiently without grid inputs. My house stays at temperate conditions year round and my monthly energy bill, consisting of non-heating uses, is around $25/month on average.