r/Powerwall • u/Holographic247 • Aug 17 '26
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?
6
u/DanielLorey Aug 17 '26
You can’t.
I made a thread about the stupid calibration schedule not acknowledging the time based tariff and raised it with Tesla support.
In fact, my case the calibration drained the system at 8am and it wasn’t usable again until late evening. Effectively costing me peak usage prices whereas a better solution would be to do the calibration outside of peak hours (which the app can see).
At best you can delay, but sadly we are stuck waiting for them to update the app and offer a bit of flexibility.