Ev charger when off grid and batteries full

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tas6 asked Apr 6, '24

Ev charger when off grid and batteries full

Fully off grid with colour gx quattro 10kw 12 x 2000c pylon tech

4kw panels on 250/85 dc charger + 2 X 12kw panels (8.2 fronius throttled to 5kw)

when batteries are full ev charging reduces significantly because victron is increasing ac frequency to throttle back solar production

would it not be very simple for the charger in auto mode just to increment charging current (1 amp at a time) when the frequency goes above 51 hz

alternative would be to have an additional setting on the ev charger to allow discharge or current draw from batteries/mains when batteries above 95 %

I appreciate that lots of things are possible by rolling sleeves up and self programming but I chose to buy an adaptive ev charger from victron which I believe should cover the normal operating of an off grid situation

offgrid AC PV Coupling ev charging station

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Lucian Popescu (Victron Energy Staff) ♦♦ commented · Apr 10 at 03:03 PM

But the EVCS is doing that already, it should start without grid if the SOC is higher than the configured value, and it allows discharging from the batteries also up to the configured value. Make sure your EVCS is updated!

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Answer 1 · 2024-04-10T15:56:34Z

prein answered · Apr 10 at 03:56 PM

Is the charger responding to the frequency or the car?

An evse is nothing more than a plug with somme current limiting control. The car is the one accepting the input. So check if the evse is giving full power. If so, it's the car..

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Lucian Popescu (Victron Energy Staff) ♦♦ commented · Apr 10 at 04:36 PM

Nobody said anything about "frequency of the car", I'm not even sure what you mean by that

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Answer 2 · 2024-04-10T20:09:31Z

prein answered · Apr 10 at 08:09 PM

A car charger, which is also a battery charger, can also be the one that does not accept a frequency of above 50 Hz.

The charger built in your car (to make 230VAC, 400V DC) can be of suspicious quality, as seen in many car manufacturers (even the very luxurious ones)

So my question is: is the strange behavior coming from the victron evse, or is the car not accepting the ac input.. (Because of frequency >51Hz)

Not a strange question right?

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Lucian Popescu (Victron Energy Staff) ♦♦ commented · Apr 10 at 08:44 PM

Yes, it's a good question indeed.

But I don't believe that's what he wanted to say. He said that the EVCS is not starting to charge, so probably something is not correctly configured

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