Alot of the designs they have in this book are based on batter backed units and is not explained to well.
I wouldnt suggest purchasing this book for any other reason then to get an idea of solar but not think it will teach you to much. I noticed some errors in it and alot of outdate info.
Best learned with hands on and it shouldnt cost 4000 that is outrageous. If your gonna spend that then buy your own system and install a few times until you get it down. LOL
This review has votes.