EVCC controlling Alfen to 0W without relay on/off? #14114
Answered
by
premultiply
hyperbart
asked this question in
Q&A Wallboxen
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I have an Alfen Pro Line which is of course controlled by EVCC. ⚡ When EVCC disables due to power limit (peak shaving), load balancing or PV surplus not enough the Alfen always "clicks", so the relay opens or closes which imposes a wear and tear (to be expected, but OK). Is this meant to be? Wouldn't it be possible to control/instruct the Alfen to send a PWM duty cycle of 0% so the car just stops pulling amps instead of cutting the voltage/power by opening the relay? |
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Answered by
premultiply
May 29, 2024
Replies: 1 comment 13 replies
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/cc @premultiply 0% DC können nicht signalisiert werden, oder? |
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13 replies
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That is not possible with IEC AC loadpoints, no. The lowest signaled power limit is equal to 6A @ 10% PWM duty cycle. It is the car that requests the EVSE to shut of the power and the EVSE will open the contactor. |
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Answer selected by
hyperbart
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Ah @premultiply , that's an interesting thing. Didn't know that it is the car that interacts with the CP line to let the EVSE know to open the contactor. Good point. @andig my question was a secondary question to the fact the load balancing function in itself works super but the contactor/relay is very reactive. My idea was to keep the contactor a little bit more relaxed either by pursuing the PWM option (which is technically not possible) or by looking for an enable timer because in most of the times you have a power consumption pattern that contains some peaks during a limited period of time (minutes). An induction cooker, microwave or a washing machine has a sprint with a couple of peaks with some minutes in between. Allowing for an enable timer would "ease" the contactor a bit. WDYT? |
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Could you share a log of the actual issue? |
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Above you can see a short spike, and EVCC reacts almost instantaneously by disabling charging (FYI: grid is configured for max peak of 3.7kW). This is very good and should be kept as such, because EVCC can't predict how long the peak will last. After a while EVCC starts again, but everytime a short peak occurs (let's say within minutes, then EVCC repeats the process which might lead to quite a "trigger happy click clack EVSE in the garage" ;) . In the log below you can see the events but sometimes the peaks are closer to each other. |
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@andig Nach LM-"Notabschaltung" eines Circuits wiedereinschalten mit Enable-Timer? |
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That is not possible with IEC AC loadpoints, no.
The lowest signaled power limit is equal to 6A @ 10% PWM duty cycle.
0% duty cycle of PWM is equal to steady DC voltage. This will signal "charging not allowed" to the car.
It is the car that requests the EVSE to shut of the power and the EVSE will open the contactor.