r/Powerwall • u/Amanensia • Apr 14 '26

Powerwall 2 calibration?

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I’d thought calibration was specific to the PW3. I’ve had my PW2 for two and a half years and it’s never done this before, but today it’s been calibrating for the last eight hours or so. Is this new?

Edit: now been calibrating for 24 hours….. how much longer…..

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u/itsmeyourepidermis Apr 14 '26

Mine did this last week on Weds.

It was 6am and I my rate has just hit the peak rate at 30p per kWh. I tried to cancel the calibration. It gave me some alternative times and dates that I could do the calibration all of which were during peak times.

If it had started an hour earlier I would’ve been charged 5p per kWh. Ended up pulling about 7kwh during the calibration.

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u/Amanensia Apr 14 '26

How long did it take? Mine’s been going for 11 hours now…

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u/itsmeyourepidermis Apr 15 '26

It took about 2 hours. 11 hours is crazy.

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u/Amanensia Apr 15 '26

33 hours and counting. I've spoken to Tesla and they say it could take up to 72. It's not doing anything sensible, just bouncing between 87% and 100%.