If you're looking for a budget system look for Steven Harris on The Survival Podcast with nostr:npub15879mltlln6k8jy32k6xvagmtqx3zhsndchcey8gjyectwldk88sq5kv0n. It's a very old podcast but all the basic info is there for a house or vehicle system. Mine is a mess (my next project it cleaning it up and building a cabinet) but it has enough power to run our necessities for 24 hours.