I’ve had two calibration cycles in the last three months. I ‘think’ (doing some heavy lifting) it’s connected with my PW2 sitting at 100% for many days because of solar and only discharging to around 75% most of the time. Yesterday it discharged to 30% but recharged during IOG hours to 85%. 

Mine has always done this, for sure in the past it hasn’t taken into account the import cost. Used to happen loads on IOF, but less frequently now.

I understand there is a large PW firmware rollout in progress, apparently to make the AI smarter, perhaps that’s what happening with yours. I believe it’s also intended to improve the forward compatibility of legacy battery systems with current systems, for example I understand it’s now possible to mix and match. I only half understand what’s going on, as usual.

@papahuhu Re the last paragraph - Join the Club! Regards, Toodles.

If you have Netzero, you can check the firmware version and it has a list of current and historical updates. They are very busy with PW2 at the moment, it’s a good thing that they are actively managing the legacy systems. There’s a PW3P soon to launch, they are prepping for that and and improved AI I understand. 

mine is a bit confused at the moment, I’m running Cosy import but am still on flux export, it should be impossible but it’s not, as I am. It’s been nicely profitable for September.

@papahuhu No, I don’t have NetZero - bit difficult to justify £7 per month for the little use I would make of it really. Regards, Toodles.

I don’t pay anything, you only pay for the pro version. My primary motivation was to use it to monitor the battery performance as I knew I’d be working it very hard. The warranty is linked to battery performance and there’s nothing on the Tesla App to communicate it to the customer, not that I don’t trust mr musk!

@papahuhu Oh sorry! Yes, of course the basic information is indeed there in the basic version; I think I was more interested in being able to do all the fancy control functions that the Tesla app doesn’t cater for. If I find that the auto calibration starts recharging my 27 kWh battery at peak rates (3 x wot I pay normally during the Cosy cheapest 8 hours), I may have to review my Scrooge-like attitude to paying NetZero a monthly / yearly subscription. I have written to Tesla about this apparent rather draconian attitude but have not heard back from them yet. Regards, Toodles.

I used to set buy and sell prices in millions of pounds, perhaps one of the reasons I did so was to minimise exactly what you are experiencing. I can’t remember exactly,mbut I do know it happens significantly less than it used to. 

i only just put in my new cosy tariff parameters yesterday, I’m watching what it does for a few days. My progeny does all this LLM build stuff but not with Tesla, he keeps trying to explain to me what he does but within 3 words I’ve got zero idea what he’s talking about.

1. @papahuhu In fact, Nett Zero?

Nope, it’s an Imperial/Cambridge start up, some fancy new AI development math that I can’t even start to comprehend.

Mine was doing calibrations every 91 days, but skipped it's last calibration which would have been due at the end of August. Obviously we do not know the algorithm Tesla uses to determine when a calibration is required, but I too wonder if it is related to how long since the battery was fully discharged/charged. Over summer on Flux, I am regularly fully discharging and rechanging again which may have extended the period between calibrations. When I was following a simple self-consumption model, the battery never dropped below ~70% over summer months and calibrations occurred every 91 days.

You can prevent it recharging at peak rate. Normally a calibration process will firstly fully discharge the battery to zero, perform the calibration and then recharge the battery. If you have your reserve set low and disable grid charging, the battery will only recharge to the reserve value and then just continue to power the house from solar/grid. Wait until cheap rate starts, then turn grid charging back on and you can recharge at cheap rate. When it's discharging at the beginning, you can turn on house load to use some of that discharge rather than exporting it to the grid if you prefer (if that is financially preferable).

The other recently added feature is to delay the calibration process. Apparently you can click on the Calibration in progress bit in the app and will be given the option to delay calibration. I've no idea how this works as I've not seen it in practice. I guess it helps if you know roughly when a calibration is coming (every 91 days?)

Posted by: @papahuhu

↑

mine is a bit confused at the moment, I’m running Cosy import but am still on flux export, it should be impossible but it’s not, as I am. It’s been nicely profitable for September.

Same here, despite trying to switch to regular Outgoing Octopus. I expect them to backdate the switch and recalculate export at the SEG rate from the date I switch off Flux.