Hi Kezo I am changing over to Octopus Flux soon they are paying 23.86 for my solar export and only 20.24 to charge up our PHEV and solar batteries, I do have a granny charger which I rarely use, in March 2020 we fitted a 7kWh EV charger then with the grant is was only £350, now with no grant they are nearer £1,000. Charging up the PHEV using the granny charger takes five and half hour, off peak rate is only for four hours.
I forgot the off peak rate was only a narrow window to charge with. Its a shame MB don’t provide chargers for PHEV’s. At least you got yours before the grant ended, which is scandalous along with the EV grant given the government are pushing us towards EV’s.