Hi Alex. Unfortunately no. As long as the car computer is off, the EVCS can’t communicate with it.
Hi Lucian, thank you. May I ask you, how communication between car and EVCS is working ? How car knows, that cable is connected ? Is there any signal from EVCS or ?
It depends on how the car manufacturer decided to do it, there are few ways:
- measure the voltage on the CP line. When it’s floating means disconnected.
- measure the resistance on PP line, when infinite means disconnected
- a sensor on the charging port or door
etc
For 1, what you can try is to power down the EVCS and power it up. The voltage on CP will go to 0 then back to 12V. Unfortunately, the hardware is not prepared to make that voltage 0, it can be either +12 or -12 as the standard demanded.
For 2, there is a resistor between PP and GND, inside the charging cable, vehicle side. The pp line is not routed from one side of the cable to the other, so it cannot be affected from EVCS side. SO to fake that, would be complicated. But test the first option and tell me the results.
So I did a few tests.
When white led goes off (Sleep mode of the car), car doesn’t react on any charging requests from EVCS and there is immediate message “charged” on EVCS status.
Power shut down of EVCS also doesn’t work, car doesn’t wake up.
Only what is working is unplug cable from EVCS and plug again.Then car wake up and start charging.
So you unplugged it from EVCS or EV?
From EVCS, because in EV it was locked (I leave a car, so door was closed and charging cable fixed)
Then it means CP line must be floating to consider that EVCS was disconnected
If you can open the EVCS while the vehicle is sleeping, try disconnecting the CP wire for few sec. then connect it back. Not sure how technical you are, but be careful, you have 230 or 400V in there.
I think it isn’t problem to open it. My plan was to open it, because I want make a “small” EVCS modification to get working 1P / 3P switching.
Only question is, which wire is CP… 
edit:
is this correct ?
Shall I disconnect complete connector (GND+CP) ?
yes, GND is not connected in there anyway
On the next EVCS version, we will be able to emulate the CP disconnection. But on this one unfortunately not. But again, if you are a DIY guy, you can put some kind of smart relay on the CP line to disconnect if necessary
yes I must make something
is the any voltage (aprox 12V) which I can use as power supply for smart switch ?
edit:
and what’s about relay which isn’t used and is ready for multirelay function (switching 1P/3P) ?
There are 230V on the output of that relay. So not a good idea.
I agree. Ok. Any power supply onboard which I can use for external wifi switch ?
Preferably 230V AC, not sure how much that smart relay will consume and
I’m still thinking what is switched when charging is starting…
What about LED ?
I’m thinking about time/pulse relay which will disconnect CP when signal comes
I prefer NC relay, because this will not any influence on the normal EVCS function
Also there are relays which will do automaticaly short pulse (open or close) when signal comes. This signal maybe can come from the light ring