but do you need stored large amounts of electric energy? most of energy use is in form of heat for space heating and hot water, and for storage of that all you need is big barrel with multiple heat exchangers (coiled pipes + baffles). put in heat from solar concentrators, heat pump maybe, furnace and you’re good in all situations

problems only really begin if you want to start up welder on cold winter night

other than that, generate energy from solar + wind turbine, top up battery, dump excess in heat pump or water heater. have small petrol generator to service surge capabilities. this will be enough in majority of cases. this is also the logic national energy grids operate on, with the difference that you can’t set up pumped hydro storage in your backyard, most of the time