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Tesla Powerwall (2) Calibration Cycles

Toodles · 2026-09-28T10:44:17Z

I have recently noticed that my Powerwall 2 has taken to autonomously carrying out a calibration cycle where the battery is charged to 100% and then discharged to my setting of 20%. In itself this is OK (ish) but as during the high usage months I will have the ‘charge from grid’ option switched on, I am concerned that as I have not control over this process, recharging may well occur during peak tariff times! Google via Alexa informs me that I cannot switch this function off and I am concerned as the calibrating cycle may be carried out as frequently as every 30 days and that recharging might well occur at the most expensive times. Has anyone any knowledge or experience with this ‘feature’ please? If I can assume that all recharging would be carried out during the cheapest times of my (Cosy) tariff, then it will just leave the matter of what happens when a ‘flat’ battery coincides with a power cut? Concerned, Toodles.

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Papahuhu

(@papahuhu)

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Posts: 441

06/10/2026 4:16 pm

@davesoa I’m rather a Luddite, but when I was running IOF an extension in the OE software took complete control of the powerwall. Although I’ve never run IOG I would assume the same is true.
Pre subscription change, net zero was also doing this, but you can’t have two different and sometimes contradictory control inputs into the PW, so I’d imagine OE blocks or disable the net zero control input.
The only reason for me to keep net zero is that it does offer a battery performance monitor that’s not available on the customer Tesla app. The reason that’s useful for me is that I flog the powerwall to death, in addition to getting max value out of my investment I have a secondary aim of degrading the performance below the 80% warranty threshold. So I want to check Tesla doesn’t diddle me out of a replacement battery, given they hide this data from the customer I have reason to question their motives.

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