Lowtech Graph lists low-tech options for every need of a home. Here you can compare them, find tutorials to build them, and link them together into a circular system. Why low-tech?
Sunlight arriving at the house, as heat and as light. It warms rooms through south glazing, heats water in a collector and makes electricity in a panel, all without fuel.
It arrives on the site on its own. Nothing in the catalogue makes it. In the builder you add it as “Solar radiation”.