It’s a little confusing. Basically, you always get cheap rate from 23:30 to 05:30. If it shows charging slots outside of this core time, you get those on the cheap rate too, bit unbelievable to believe but true. I think the rationale is Octopus wants the big loads, such as your EV, to kick in when they want to balance the grid. Just because your house is taking advantage of the cheap rate is by-the-by.
The minor flaw in this is that those of us with home batteries will, obviously, want to take advantage of the cheap rate.
I’ve only just installed this plug-in and I hope I can control my battery inverter’s charging habits too…
Andy