@Brydo have a look at Netzero app, it can be used to stop the battery from charging the car when for example Octopus schedule a charge outside the cheap rate window, as it’s not the best use of energy to charge from the battery during offpeak hours, as the charge/discharge will only be round c85% efficient.
Can’t remember if you can control you H) from it, rather than opening another layer of complexity with Home Assistant – Although on the positive side, you will be able to automate your house😂