EV Charging Station on 3 Phase Multiplus II using AC-OUT2 for Intelligent Phase Switching

Question

question

power4me asked Sep 17, '23

EV Charging Station on 3 Phase Multiplus II using AC-OUT2 for Intelligent Phase Switching

Although I am very happy with my Victron installation, I still hesitate to buy the EV Charging Station due to the lack of automatic phase switching.

I was wondering if the currently unoccupied AC-OUT2 of my three Multiplusses could be a solution to provide this feature. Since AC-OUT2 can be switched software controlled, it could provide one phase or three phase supply to the EVCS depending of the surplus energy availability.

Is it possible to control the OUT2 relay of each Multiplus independently in a three phase setup?

Using the setup described above, the currently available EVCS hardware could provide phase switching with no additional hardware, just some clever software within a Victron system.

As seen in other posts I’m not the only one longing for a solution for intelligent surplus charging with average PV installations.

Multiplus-II 3 phase ev charging station ac-out-2

2 |3000

Attachments: Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

103 People are following this question.

Modifications Space

Node Red Space

Answer 1 · 2023-09-17T15:22:05Z

dennibu answered · Sep 17, 2023 at 03:22 PM

I once read that switching on a phase during the charging process can have bad consequences.

I think the idea is good, but it would be too dangerous for me

2 |3000

Attachments: Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

Answer 2 · 2023-09-18T22:15:07Z

power4me answered · Sep 18, 2023 at 10:15 PM

If the switching is done in collaboration with the EVCS it could be done with no harm to the vehice e.g. interrupting one phase charge then switching to 3 phase and starting again.

I mean there must be a proper way to do it since there are less expensive wallboxes on the market capable of phase switching.

I would prefer a Victron EVCS because of the seamless integration but phase switching is a must, having actually only a 6 kWp PV

2 |3000

Attachments: Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

Answer 3 · 2023-09-19T08:37:39Z

dennibu answered · Sep 19, 2023 at 08:37 AM

With 6Kwp, it is enough to load permanently with 1 phase. Phases 2 and 3 are not needed anyway. I would either permanently disconnect L2 and L3 or use a single-phase charging cable. With the phase changeover, it happens again and again that Renault's camelion loaders are destroyed.

2 |3000

Attachments: Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

Answer 4 · 2023-09-19T08:53:28Z

luphi answered · Sep 19, 2023 at 08:53 AM

There is a way to make the EVCS capable of switching between 1p and 3p by replacing the internal 4p contactor by 2x2p contactors:

see https://community.victronenergy.com/questions/215013/single-phase-charging-on-three-phase-setup.html

1

2 |3000

Attachments: Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

GRIGORIU commented · Sep 19, 2023 at 09:09 AM

Hi,

Th info on the following thread is not sufficient to make it working. I think a separate thread in the modification section could be created. Is there anyone that has done it and willing to make a clear step by step procedure with a BOM ? (https://community.victronenergy.com/questions/215013/single-phase-charging-on-three-phase-setup.html )

0 ·

Answer 5 · 2023-09-20T20:07:55Z

power4me answered · Sep 20, 2023 at 08:07 PM

The aim of this thread is to find a viable solution without additional external hardware or manipulating the EV Charging Station. Other threads already addressed these topics.

If no or not enough surplus solar energy is available or charging needs to be done in time I also want to switch easily by app between 1 and 3 phase operation.

The question remains: Is it possible to control the OUT2 relay of each Multiplus independently in a three phase setup?

2 |3000

Attachments: Up to 8 attachments (including images) can be used with a maximum of 190.8 MiB each and 286.6 MiB total.

question