Your walls look so beautiful! Congrats on the book haul and your goal of living economically. One of the best books I've come across in regards to building is called the Barefoot Architect. As for our solar components, I've just modified car components to suit the house. We have car charger adapters and devices that run off DC without having to convert to AC. We're upgraded to two 150 AH lead-acid batteries from car batteries which is enough to provide lighting and charging of basic devices.