question

andreas-siebenmorgen avatar image
andreas-siebenmorgen asked

EV Charging Station: Configure using Modbus

I am getting nuts telling my Victron EV charging station to charge my car in off grid mode + Auto mode.

I've read many post and tried many things, but it does not work.

During my search I read something about Modbus, which I am totally unconfident with.

I've assumed that I don't need to be a "programmer" to setup my EVCS doing things I want to.

FYI:

- Cerbo + Multiplus + EVCS etc. with latest firmware

- Manual Mode is working fine

- Installed PV peak Power 4800W (during actual weather conditions about 3500W peak)

One of my unasnswered questions:

- What are the ultimate conditions for my EVCS to start charging in Auto mode?

I've read so may times "starts when there is enough PV excess power".

But: What is "enough excess power", where and how is it defined?


I need about 1840 w when set to 8 amps for charging my car, so getting more than 3000 w from the roof must be "enough excess power", right or wrong?

But it does not start.

Also there is no setup in EVCS where I can set a power value which has to be reached before charging starts.

BUT:

It look like there is a value within the Modbus table on the EVCS which maybe could be what I am searching for.

1682166940369.png

Can anybody PLEASE tell me, if I am on the right track, and if yes, how to check and modify this value.

BTW: I am totally new to this Modbus thing!!! So I need a manual for dummys ;-)

ev charging station
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1 Answer
Lucian Popescu (Victron Energy Staff) avatar image
Lucian Popescu (Victron Energy Staff) answered ·

It should work without modifying any of the modbus parameters. Can you share a video from the main webpage of the EVCS while not charging in automatic mode?


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andreas-siebenmorgen avatar image andreas-siebenmorgen commented ·


Video attached…

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Lucian Popescu (Victron Energy Staff) avatar image Lucian Popescu (Victron Energy Staff) ♦♦ andreas-siebenmorgen commented ·
Your system consumes from the grid, that's the reason. Can you modify the grid set point to a lower value? EVCS threshold for that parameter is 25W, you can increase it if you want, Modbus TCP address 5084
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