@old_scientist Yes, it is the not knowing when the calibration is due that is the problem. When I saw the notice of intent show up, I wondered how I could tell when and how long the process would take. I was able to delay the process by selecting the time, I am at a loss to know how long it might take and when therefore, it would start to recharge. I feel the process needs some refinement to enable users to avoid peak rate recharging cycles! Worried, Toodles.

One solution is overload the tariff, it worked. Shocks it into obeying, it did for me at least.

These were my settings at the time, looks strange I know.

@papahuhu My loadings in the tariff are not that extreme at present but I thought that they might suffice to tell Tesla my intentions and desires. Just for fun, I might add a few noughts and reduce other figures anyway. Regards, Toodles.

I’ve had the real tariff data in mine for the last week. It hasn’t charged on the cosy off peak rate once. I was just experimenting to see if it had improved as I’m on the newest firmware.

it definitely hasn’t got any better, I’ll likely start the heating in the next fortnight so I’ll be adjusting mine too. It’s a bit rubbish that it’s necessary, it’s not cheap kit. 

@papahuhu Indeed, at the price of Tesla Powerwall kit, I think they ought to be offering better algorithms that observe TOU tariffs rather than be profligate with our energy consumption. Regards, Toodles.

In previous firmware versions you could not effectively set the sell price higher than the buy price - the software just ignores it and sets both values the same. So if you want to force export during a session, set both sell and buy prices the same at the high level you desire.

When deciding whether to charge from the grid, the AI will need a week or two of data to learn your consumption patterns. This is probably OK as small amounts of heating phase in slowly over autumn. If it's not doing what you want, you can force it to grid charge by increasing the reserve in the cheap rate slot and then reducing it again, or you can again you could change the buy/sell price to 0p for those sessions. That works well for the 10pm-midnight and 4-7am slots, but be careful setting a 0p sell price during the 1-4pm slot as that will have unforeseen consequences as it will export solar during the morning rather than charging the battery to reserve space for solar in the afternoon when you've told it that it has zero value.

Last winter I only used peak and off-peak settings, priced at 15p (off-peak) and £2.00 (peak) which worked well - IOW don't you dare import from the grid other than during off-peak times. Sell was priced at 15p for all periods. This worked perfectly once the system had learnt my usage.

@old_scientist It is what is going to happen during the re-charge cycle in the Calibration procedure that I am most concerned with as we don’t appear to have any say over the schedule. Regards, Toodles.

@old_scientist Yes, Oct, Nov and Dec are give constantly changing requirements as we transition from nett export to nett import. But at this very moment the system is taking power directly from the grid at the mid price tariff, whereas it should have charged itself up between 4-7am to cover my day time use (it’s raining and cloudy here today). 

(I’m still on flux export, how did you get on with agile export? There have been massive fluctuations, did you get it  to work to your advantage other than by changing tariff settings every 24hrs?)

Posted by: @papahuhu

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@old_scientist Yes, Oct, Nov and Dec are give constantly changing requirements as we transition from nett export to nett import. But at this very moment the system is taking power directly from the grid at the mid price tariff, whereas it should have charged itself up between 4-7am to cover my day time use (it’s raining and cloudy here today). 

(I’m still on flux export, how did you get on with agile export? There have been massive fluctuations, did you get it  to work to your advantage other than by changing tariff settings every 24hrs?)

I'm still (stuck) on Flux import too. I did apply to switch to regular Outgoing (12p SEG) but that was over 2 weeks ago now and no sign of anything happening. 

Posted by: @toodles

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@old_scientist It is what is going to happen during the re-charge cycle in the Calibration procedure that I am most concerned with as we don’t appear to have any say over the schedule. Regards, Toodles.

As I posted earlier, you can delay the recharge process if you notice a calibration is in progress. Reduce your reserve to zero and disable Grid Charing in the settings, and once the discharge calibration has completed it should sit there at 0% or recharge from excess solar only. When the next cheap rate slot arrives, put your reserve setting back to it's desired level and re-enable grid charging to allow it to recharge at cheap rate.

You will of course pull from the grid to cover house load if there is no solar, but at least you are not recharging 27kW of batteries at peak rate.

@old_scientist Don’t forget to keep an eye on what’s happening to gas prices and if there’s a big improvement in supply you need to consider flipping to variable. As it stands today, week 6 of the 11 week price setting, the current estimate is 16% Jan electricity increase. But even at 16% our rate will be less than the Jan variable price. 

if there is a sudden big increase in supply, say uk.gov approves one of the North Sea gas expansions well before the 11 weeks are up, that might change the calculation. At the moment it seems unlikely, although it seems political suicide to me. Very strange. 

@old_scientist The operative word there is ‘notice’, it would be nice if the app could send the operator a brief email notice of intent wouldn’t it? Having to keep toggling the settings is fraught with possible whoopses resulting in unintentional actions. With advance notice, one could plan how to deal with the recharge cycle timing. Regards, Toodles.