I’ve wondered as solar gets more popular we’ll have heat and cooling systems that take advantage of the free excess electricity.

For example heat my water to 140% the ideal temp and cool a thermal sink for ac when I’m away from home during peak solar.

Then when I’m at home and it’s no longer sunny my electricity needs are nil as I utilize the pre stored coolant and heat.

Haven’t done the math but I’d assume a 500 gallon water tank that’s heated or cooled during peak solar with insulation could be used to keep your home at the perfect temperature by using excess solar.