If the car has gone into sleep mode it will most likely not detect the charger applying the CP signal once the charger has booted up.
If you filter the charger output with a diode & 100uF capacitor, the car gets the 12v signal, but when the signal starts pulsing, the diode and capacitor prevent the car realising. When you want to start charging, short out the diode, and disconnect the capacitor with a change over relay.As long as the PP is connected to PE via a resistor in the cable the car will know there is a cable plugged in, in fact this resistor also tells the car the current rating of the cable, if the car relied on the CP to tell if there was a plug in you'd have the situation where turning the power off to the charger could lead to you driving off with a cable in.
I plan to interrupt the CP signal, so like you saw with the Zoe the car might think there is a fault with the charger until the CP is connected.
I wish it was that simple to me ?.The communication controller draws very little power, I have installed a timer switching the supply to it. It really is that simple.
I believe you want the charger to see the car. I came up with my design as sometimes I did not insert the plug in the car adequately. Using diode & capacitor, the car pulls the 12v down to 9v, and the charger light changes colour. The car never gets the next signal though, (the 9v pulsing and going negative) as the diode and capacitor keep the output at around 8.4v dc.Or use an op-amp to buffer the CP signal, the car slaps the resistor across it to start the charge but the charger doesn't see it, then bypass the op-amp with a relay and the charger will turn the supply on.
Yes I'd thought of that too. It will be one of the first things I try when it arrives. I'm retired so it doesn't really matter to me when I go to bed or get up but for someone at work it could be a hassle.I wonder if unlocking and then locking the car, with the remote, just before you go to bed, would wake the car up for long enough to cover the Economy7 (or whatever) start time, when using a timed charger?
Might even work from the bedroom.
A minor faff, but could mitigate this problem, without major electrical fiddling.
My car take several hours - probably 6 - to go to sleep, so the actual MG ZS EV sleep time is crucial for this.