I am not good at this. I use Octopus but have never managed to link it with GivEnergy despite following the instructions. So I have tried to use timing to get the battery to charge at night during the cheap rate. It does not do this naturally. So I set the first time to charge the battery between 00.01 - 02:00 and save and its all great. But the next morning it has not charged and the time set is not there. Do not know how to fix this.
Help please