Sorry for hijacking your thread,
@janeyb, but I think you're sorted whereas right now I am not!
Does Octopus give you a way to access your account (hence schedule settings) via a website? If yes then you could try accessing via your laptop.
Another option may be to try rebooting your WiFi router.
I have tried rebooting the wifi (good thought) but no difference. I don't have web access to Octopus at all. The MyEnergi web site is a bit user-hostile and I'm probably as well just sorting things out from the Zappi itself.
Current thinking. Last time I charged the car up fully from 8% it took seven hours to get it to 100%. The only snag at the end of that was that it decided to balance for at least an hour, most unusually, so it wasn't finished its balance charge by the time the Octopus schedule closed, which is why I'd prefer to do it again and let it finish.
Thus I actually only need an extra hour of peak-rate electricity to get the car to 100% (the balancing doesn't count because that is negligible). I can also afford to let it have access to my home battery for that hour, because an hour of maximum discharge only takes about 40% out of the battery and even if the battery is at 60% at 6.30 am that is not a problem because the house isn't going to want that much and tomorrow's solar looks as if it's going to be OK.
However, I might start the car going at eleven so it gets the tail end of this evening's battery export, and then it should only need about 20% of the newly-charged battery between 5.30 and 6 am. That should give plenty battery remaining to keep the house happy until it can grab some solar. On the couple of occasions when the car has charged from a combination of mains and battery the maximum mains draw has been 4.3 kw. So, 4.3 kwh at the peak price is £1.09. If that's the extra this is going to cost me over having an Octopus schedule, it's not the end of the world. (It's not, of course, because I'm also giving the car some power that would otherwise be exported, but let's not be too picky.)
So that's the plan. I go out to the Zappi about eleven, wipe all schedules, and just tell it to charge till the car is full. Fingers crossed.
Doesn't zappi have buttons on it?
Yes, and it looks as if that's the plan, right enough.