Yeah, well under ideal conditions the electric bill is near about $150/month. And I almost forgot to mention that I was also planning to add a Power Wall UPS bank (13kWh) for starters though this is the most expensive add-on at $6,600 for the hardware alone.
Wow, that's a nice big electric bill. I finally couldn't sleep last night, shut the windows, and kicked on the air. It was still dark of course, but the whole-house system ran until I fell asleep and was running when I got up for the first pee break. It was pushing 100°F all day, and with the strong wind, I felt like an entree in a convection oven. ;^) I turned the thermo up to 80, and it has since cooled down outdoors. With the windows and doors closed, I don't think it will run much, and plan to shut it off tomorrow.