You should store your solar energy as heat. You move the heat from outside or underground into your house with a heat pump where the heat storage lasts a week o

You should store your solar energy as heat. You move the heat from outside or underground into your house with a heat pump where the heat storage lasts a week or more. You need very little solar to heat your house this way. So for a mild climate your installer seems to have done you a disservice and probably overcharged you. You can heat an average house with solar for under $14K if properly installed.