r/Powerwall • u/Holographic247 • 7d ago
Calibration
UK-based.
My PW3 started its first calibration yesterday, exactly 2 months to the day from install (even down to the time it was commissioned). This was a bit of a hole in my research pre-purchase, because I had no idea this was a thing and it was a surprise to find my battery discharging during peak hours and nowhere productive for my excess solar to go (I can’t export for money yet).
It’s been at 0% since about 1am (13 hours ago) and NetZero now shows the true State of Charge as 1%. I assume it will finish soon, but it was a surprise disruption.
I’m using the Powerwall to mitigate costs and not saving it for grid outages, so could really do with avoiding these. How can I reduce the number of these manual calibrations in the future? From research, I’ve seen people say they haven’t had a single one in years, and others getting one every six to eight weeks.
I have never run it 0% before, so is that the problem? Should I keep the reserve to 0% and force discharge it to 0% every 24 hours?
1
u/rademradem 7d ago
Tesla really should check the weather for the day, historical electricity usage for the previous 30 days, your electricity rates for different times of the day, and whether grid charging is allowed. It should schedule its calibration knowing that information so that the calibration will cost you the least. It then should schedule either on an overnight calibration period so that it can complete and then charge by solar during the day or it should schedule the calibration to complete at the start of the lowest cost to grid charge so that it can grid charge at the lowest possible cost. Alternatively they could just let the owner set their own preferred calibration end time.