@toodles But that’s where your batteries come in, to make up the deficit. You have 2 if I remember correctly, so should be very easy for you. Isn’t that how you work them?

But at 16.00, we’re are outputting 8ish kW, by 19.00 it’s down to 3 ish. We aren’t perfect South, maybe that helps in the afternoon, it’s certainly not a normal distribution. I had always assumed the heavy skewing was largely tree shading, but maybe it’s partially aspect and pitch too. 

@papahuhu My reply was based on your comment of 6 kW of PV, perhaps you meant availability of a total of PV and battery capacity. In that instance I can output 10 kW from the Tesla system albeit from pure storage capacity or some solar contributing to the 10 kW total (G99). Last year, I gave IOF a try (too early in the year perhaps) but found that with 10 kWh export, my 27 kWh Powerwall set up was depleted after ~2.5 hours whereupon Octopus started to recharge my battery at the peak charge duing the period of greatest demand - thus defeating the object to some extent. I have asked O.E. to inform me if and when IOF returns and may give it a second chance. Recharges, Toodles.

@toodles That’s strange, on IOF mine never imported a bean at peak.I do remember, rather like the machine learning for the homely, it did take a few days to “learn” from the usage data and avoid stupid errors. 

For me, my only objective is to try to maintain annualised zero energy bills for as long as I can. To do so is my transient Sisyphus victory in this chaotic and absurd universe, doesn’t take much to appease my angst!

@papahuhu I found that IOF would attempt to recharge as soon as it reached the preset 20% reserve and I had to intervene by opening the Tesla app and taking action to stop it. 

I wrote to OE and explained and expressed a wish that they investigate and rectify please. Several exchanges of email ensued but no mention about re-writing of the code for the app was forthcoming. I live in hopes that they have rectified the problem now; I did hear that other IOF users experienced the same feature though, Regards, Toodles.

Thanks @papahuhu for your replies.

Posted by: @toodles

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@papahuhu My reply was based on your comment of 6 kW of PV, perhaps you meant availability of a total of PV and battery capacity. In that instance I can output 10 kW from the Tesla system albeit from pure storage capacity or some solar contributing to the 10 kW total (G99). Last year, I gave IOF a try (too early in the year perhaps) but found that with 10 kWh export, my 27 kWh Powerwall set up was depleted after ~2.5 hours whereupon Octopus started to recharge my battery at the peak charge duing the period of greatest demand - thus defeating the object to some extent. I have asked O.E. to inform me if and when IOF returns and may give it a second chance. Recharges, Toodles.

I know IOF wasn't perfect, and if the battery was empty before 7pm, it could then start importing again at peak rate (however, given that import and export rates are always the same on IOF, you're not actually losing anything other than conversion losses but it does seem very counter-intuitive). I did see signs of intelligent behaviour though - I'm not sure if it knew my battery couldn't sustain export for the full 3h peak window, so often mine would only partake in 2h:30mins of the export window, often not exporting anything from the battery during 4-4:30pm or 4:30-5pm, and then going flat out from 5-7pm.

Regular Flux is different though, in that you are in control (or maybe the Tesla AI is) rather than Octopus. So if you know your batteries can fully discharge in 2.5h rather than needing the full 3h window, you can just manually set the peak export period as 4:30-7:00pm, holding back export by 30mins to try to ensure your battery is not down to it's reserve until 7pm. In other words, you are not fighting Octopus for control, but are now working with the Tesla AI under Time based control, so it should be easier to control and get the outcome that you want.

@toodles Having more battery capacity (2xPW) allows you to export more at peak rate so there should be more financial benefit (not to mention the clear benefits to the grid by supporting the grid at peak time) to running Flux over a simple self-consumption / SEG export strategy (Cosy import rate is close enough to SEG export rate that I'm essentially just self consuming) as I do with a similar amount of solar and just the one PW3.

I'm going to run some numbers through my own spreadsheet for good, average and bad summer solar days to see what the numbers look like. I'm hoping IOF will become available again which makes the choice easy. I may phone Octopus today to ask if they know when it may become available again, but I doubt the staff manning the phones would know.