Only on delayed charging: EV Charger says 'charged' but car battery is empty

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joris-trooster asked Oct 4, '23

Only on delayed charging: EV Charger says 'charged' but car battery is empty

When I connect my car (Volvo XC90 T8) to the charger (new model without display), it starts charging the car (manual mode, autostart enabled).

When I stop the charging and leave the cable connected to resume charging later (when energy prices are low or the sun is shining), it starts charging, but a few seconds later, it stops, and the charging status says 'charged'.

The strange thing is that it immediately starts charging when I unlock the car. If I use the Volvo on Call app to unlock the vehicle remotely, it also starts charging immediately (although that does not open the doors, only if you touch the trunk lock within 2 minutes).

I, therefore, cannot start the charging programmatically (via node-red, for example) because it thinks the car is charged while it is not. I never had this with my previous two chargers (Shell Recharge and Zappier).

The charge current is set to 16A (the max; the car only charges on one phase), and I have done the CP calibration multiple times.

evcs

5

2 |3000

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motylu commented · Nov 04, 2023 at 06:16 PM

Hello @Joris Trooster .

Very similar experiences I had with Renault Zoe. After several stops and starts in Auto mode due to low available PV power (in older FW versions of the EVCS without possibility to charge from battery/grid for defined time), EVCS goes to Charged state and stays in it. But when I go around the vehicle with car key in my pocket, Zoe unlocks the door and suprisingly charging process automatically starts again...

Also I had another problem with Zoe and EVCS Charged state described here:

https://community.victronenergy.com/questions/223522/unable-in-node-red-to-stop-charging-on-ev-charging.html

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mikenr motylu commented · Nov 26, 2023 at 10:16 AM

I have a Renault Zoe and have exactly the same problem, I have just updated the firmware on my charger to 1.27 rebooted it and it does exactly the same - some help please Victron :)

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motylu mikenr commented · Dec 02, 2023 at 06:21 AM

Now I have VW ID.3 and see similar behaviour. VW was set for charging to 80% SOC and after reaching 80% EVCS stop charging and switch to Charged state. When I unlock the car, EVCS start charging again for short time and then switch back to Charged mode.

In my opinion there could be some issue related to "communication" (CP signal) between car and EVCS.

Please, @Lucian Popescu (Victron Energy Staff), can you check out this? From my side, correct behaviour should be, that after switching to Charged state EVCS can start charging only after car reconnecting...

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Lucian Popescu (Victron Energy Staff) ♦♦ motylu commented · Dec 03, 2023 at 09:05 AM

That's not something that the EVCS is deciding, it's the opposite. The car is telling the EVCS when to start charging or when is charged based on the voltage level.
The charging station only tells the vehicle what is the available power by changing the duty cycle of the pwm signal.

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pilot-wire-communication-between-charger.png (12.2 KiB)

motylu Lucian Popescu (Victron Energy Staff) ♦♦ commented · Dec 03, 2023 at 12:38 PM

Thanks for the details @Lucian Popescu (Victron Energy Staff) .

So it means, that when EVCS is in Charged state and charging is not stopped (by button on screen or externally by command) or charging cable is not reconnected, it can continue with charging, when car set signal to "ready for charging"?

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