Here are the last three days according to Screenconnect. The air temp sensor is in direct sunlight I believe - ambient air temp peaked at 88F the first day and is supposed to be 90F today. I have no cover and get quite a bit of heat loss at night, clearly.
First day no heat pump, no solar, no cover.
Second day, heat pump ran from 10am-6pm.
Third day is right now.
Without a cover this is going to be expensive. I haven’t measured running amps from the 8450 but I figure it’s in the 30A range. My electricity averages $0.31/kWh due to high usage and so this thing will cost me $2.10/hour to run - $17/day. Once I get the Solar PV installed and get a cover this will all make more sense. It was nice getting warmer water at dusk last night - solar thermal could not provide that. It’s still cheaper than gas if you consider here gas is $2/therm and 400k btu heater is 4 therms/hour. That’s two hours of gas heat (650k btu in pool) compared to 8 hours heat pump (800k btu in pool). And that’s assuming my 140k btu heat pump is deregulated down to 100k due to low humidity which I think is WAY conservative and probably wrong. And once the PV goes up I can dump excess generation into the pool instead of being reimbursed the absurd generation credit of $.05/kWh.