"a lot of power" is subjective, but . . . you have a HWS on CL (controlled load) ?Most CL is now put onto the solar soak hours, with renewables putting in surplus power through the day.The opposite of how it used to be in the early hours, usually after midnight until about 0600.During either, a HWS will cut on and heat to whatever is required, cut out, it might be an hour, or if much HW usage it could be 2 - 3 hours.Depending where you are though, many DNSPs, the electricity suppliers, have two ...