question

You can change it

Hello @Lucian Popescu (Victron Energy Staff), thank you (again) for your quick response, but I can't change it. When I try, it says "Written 1 references" but when I poll again the value stays unchanged.

By the way, other registers like 5017 (max current) are working fine.

$ mbpoll -0 -1 -a1 -r5056 evcs 2
mbpoll 1.0-0 - FieldTalk(tm) Modbus(R) Master Simulator
Copyright © 2015-2019 Pascal JEAN, https://github.com/epsilonrt/mbpoll
This program comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to redistribute it
under certain conditions; type 'mbpoll -w' for details.

Protocol configuration: Modbus TCP
Slave configuration...: address = [1]
                        start reference = 5056, count = 1
Communication.........: evcs, port 502, t/o 1.00 s, poll rate 1000 ms
Data type.............: 16-bit register, output (holding) register table

Written 1 references.

$ mbpoll -0 -1 -a1 -r5055 -c5 evcs
mbpoll 1.0-0 - FieldTalk(tm) Modbus(R) Master Simulator
Copyright © 2015-2019 Pascal JEAN, https://github.com/epsilonrt/mbpoll
This program comes with ABSOLUTELY NO WARRANTY.
This is free software, and you are welcome to redistribute it
under certain conditions; type 'mbpoll -w' for details.

Protocol configuration: Modbus TCP
Slave configuration...: address = [1]
                        start reference = 5055, count = 5
Communication.........: evcs, port 502, t/o 1.00 s, poll rate 1000 ms
Data type.............: 16-bit register, output (holding) register table

-- Polling slave 1...
[5055]: 65535 (-1)
[5056]: 65535 (-1)
[5057]: 65535 (-1)
[5058]: 65535 (-1)
[5059]: 65535 (-1)

nobody with any ideas? Any help is really appreciated.

Cheers... luphi

can you give me the vrm portal ID?

Hello Lucian, thank you for your help. it's working now.

Did you install the contactors finally ?

Yes, I did. In theory everything should work. I'm really exited to test it out. Unfortunately the car is not yet delivered. The dealer promised he will get it next week....

What I was missing, was modbus register 5100, which enables/disables phase switching. Setting it to 1 makes the registers 5055-5059 changeable.

From hardware perspective, I was indeed going for the contactors mentioned above. (less than 40€ per contactor including shipping in Germany). I had a DIN rail laying around, so I replaced it too, to fit the size of the new contactors.

I impleteted the phase switching for the EVCS NS and made a tiny documentation. Comments are appreciated!

BR

Heiko

EVCS_Phasenumschaltung.pdf

Hello

That's good news

Does the switching of the phases work automatically?

or does the switchover have to be done via Modbus?

Does the car also accept the switch?

Up to now, I tested only the manual mode.

When I switch the Manual Mode via Modbus 5055 from 1 to 0(three phase) during charging the EVCS stops charging, switches to 3-Phase an starts again within a couple of seconds (Parameter 5101 might be the corresponding).

Sun is missing...also next days here in cologne. Testing the auto mode seems to take a while.

May be Lucian can give an explanation to the parameter 5057 - 59 in the Modbus TCP Register List?

Best Regards

Heiko

they build the switching hysteresis, I assume:

- switching from 1p to 3p if surplus >(5057)W for (5059)s

- switching from 3p to 1p if surplus <(5058)W for (5059)s

To be honest, I'm not sure, if it is really correct, what I wrote.

I configured 5059 to 10s and 5057 to 4500W. The EVCS is charging since a couple of minutes now with 16A@1p and ~2kW are send to the grid, but it's not switching to 3p :-(

My assumption was, that the EVCS sums up the current charge current + the energy send to the grid and if that is bigger than the value of register 5057, it would switch to 3p. Unfortunately that doesn't happen. Does it really requires 4500W (4800W by default) in addition to the ~3600W 1p charging to switch to 3p?

@Lucian Popescu (Victron Energy Staff) would you mind to clue us up.

Cheers, luphi

Here are my parameters for phase switching. Ich works pretty good. My E-UP only can charge via two phases.

BR

Heiko

The Discription for modify the charger is for the new generation without a display, does it also work with old Version, whitch has the display?

Hi everyone!

I just completed the modification of my EVCS according to the 'instructions' of @hbraak in this topic. Thanks a ton!

At first glance everything is looking good and after changing ModBus register 5100 fro 0 to 1 I see the modified SETTINGS menu where it is possible to preselect 1P/3P for MANUAL and AUTO mode.

But how does SCHEDULED mode behave? 1P? 3P? Any parameters that i overlooked?

Best regards, Jochen

@Lucian Popescu (Victron Energy Staff) Maybe any ideas how SCHEDULED mode works? 1P or 3P?

Today I had the chance to observe and test the phase switching for the first time. Good news is it works, but...

I started today's test with a current limit of 16A and parameters #5057 = 4400 and #5058 = 3500. The charger remained at 3.6kW 1P for appr. 30 minutes. As soon as I changed #5057 = 3400 (and #5058 = 3200) it switched to 3P right away (appr. 11:45)...

So let's first agree how the control algorithm seems to works. The parameters 5057 / 5058 are not solar excess, but the actual EV charging power that the EV uses at the moment to charge the EV.

So how does AUTO mode calcualte the charging power used? Let's see the EVCS manual, section 2.2 Features (my markup):

So AUTO mode will try to keep feed-in at 0, of course within it's limits (min - max charging current). That means, there might be a small issue for

1. installations which only provide a limited amount of solar excess during the preferred charging times either because other consumers require power during charging or because solar power itself is limited to an effective power below appr. 4.5 - 5.0 kW.
   
   and / or
   
   
2. installations that are limited to a max charging current of 16A (due to regulatory, power management, charging cable or other reasons).
   
   Because 16A single phase (considering 230V as reference voltage) equals 3.68 kW charging power and because the minimum current is set at 6A either 1P or 3P (per most EV's specification) this means for three phase operation the minimum power will be 4.14 kW.

So there is a gap between 3.68 kW (max single phase) and 4.14 kW (min three phase). But in order to achieve (and mantain!) a switchover from 1P to 3P the charger would have to reach >= 4.14 kW power which it will never do 1P with a 16A limit.

Setting the limit to 18A (regulatory issues aside and proper wiring and fusing assumed) would result in a gap of 0W as 18A * 230V = 3 * 6A * 230V = 4.14 kW. This might work but will be far from ideal because there is no room for any kind of hysteresis.

My understanding as of now is, that in order to benefit from the AUTO phase switching

• the car has to be able to charge single phase with minimum min 20A (for switch to 1P to 3P, 2P is better but rare as layed out further above)
• the EV charging cable must be able to allow min 20A
• wiring and fusing must be compatible with 20A ops.

So for the sake of science ;-) I will swap my EVCS main fuse from 16A to 20A, set the current limit to 20A and the parameters 5057 to 4600 an 5058 to 4200. This should give the EVCS 400W to play with.

I will report back...

Best regards, Jochen