Have installed Solar Twin hot water system that runs off grid using its own PV panel and supercapacitor power storage. It has worked faultlessly for about five years and needs no routine maintenance as the water need no inhibitor. Would have liked to have a biomass boiler that also ran off grid.
Join your local Transition group who will likely have an energy group so you can talk to those in your community who may have done much research that will help. If no local group read as much as possible and if time allows visit eco/renewable energy shows.