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3 Phase grid with 1 Phase ESS

Good day,

I'd kindly like to know if its possible to backup L3 with Multi or Quattro and leave L1, L2 without Quattro as shown on the picture. Backfeed is allowed on 3~ 400V 50Hz grid.


Jens T. S. asked

0 Answers

Phase rotation Issue

We have a three phase system with 3 Quattros 8000. The Inverters/chargers accept the AC supply normally and go to charger mode but there is an alarm of Phase rotation warning raised on CCGX and VRM

"VE.Bus System - Phase rotation: Warning "

Since the system accepts ACin and charges the batteries normally as well as passing this input to loads why we get this alarm on the system. Can this happen? Any ideas?

emmanuel asked
emmanuel edited ·

0 Answers

3 x MP II 48/5000 on-grid ESS with 1 x Quattro 48/10000 for generator charging

Hi all,

I have an existing 3 phase on-grid, ESS installation consisting of 3 x MPII 48/5000, 1 x 450/200 charger, 1 x CCGX and 6 x Pylontech US3000's.

My customer would like to add a 4th inverter/charger for charging the batteries using a 1 phase generator.

Question, to comply with Pylontech's warranty conditions, ie managed charging, how can I set this up to comply?

I understand the 4th inverter can be setup to independently charge, but without the comms link to the Pylontech BMS, no battery warranty.

I have read previous posts on putting 1 phase into the master L1 of the 3 phase system (without installing the 4th inverter/charger) however it doesn't work for ESS systems.

Any ideas much appreciated.

wesley-corbet asked

0 Answers

Quatro 3 phase : DC (solar charged) Inverter priority.

Hi all,

If i have an existing setup as followed:


Then i have a 3 phase + N system, so 230/400 volts correct?

While i have a solar system connected to the batteries and the shore-power in this case is really expensive on the camping, i prefer the system uses battery-power over shore power.

To accomplish this i plan to use virtual assistant with "ignore ac input" together with battery setting rules. So when the batteries are draind, the system will switch to AC input and will charge the batteries again.

I will limit the charger so the solar system can do most.

My question:

While the quatro's have to switch, and there are 3 of them, can i expect trouble because of non-synchonicity and for example burn out N cable or other problems?

Is there a common system for this?

Best regards

heinzie asked
heinzie edited ·

0 Answers

2x Multiplus II 5000/48 split phase 230v in 3 phase


I've been running a single Multiplus II 48/5000 for over a year. I live in Denmark and have 3 phases + Neutral in my home.

So i wanted to add a second Multiplus, for L2 to be able to produce more power, since i have 15 KwH on the roof.

Ive configured them as split phase with 120 degrees angle, however the inverters are just in "inverting" mode, and doesnt kick in to absorb, and feed in power from my battery. When i lool in VRM i can see that "Active AC input" is disconnected. I can also see that i have 230V on L1 and 233V on L2, and on AC-OUT L1 and AC-OUT L2 is at 230V 49,9 HZ.

I really cant seem to figure out, why Active AC input is dicsonnected.

Can someone help?

m1kkel asked

0 Answers

Multiplus switching to inverting without loss of grid

We have 3 Victron Multiplus 5000's that are in 3-phase. The system powers an AV rack room on our vessel. Our mains supply is from generators. What we see happening is the output current drops even though the grid power is available. The multiplus' go into inverter mode for a brief second. Then to bulk. Then shut off and automatically comes back on.


Anyone have an idea why the multiplus goes into inverter mode with grid power present?

eminence-eto asked
denzel commented ·

0 Answers

EasySolar , installation en triphasé

bonjour , récemment inscrit, merci de votre accueil prochain à cette question :)

j'ai actuellement 3 easysolar 5000 en 48v pour trois circuits indépendants en mono 230v

chacun a son installation avec son jeu de batteries et ses panneaux

je souhaiterais réunir tout ça et passer l'ensemble en tri-phasé

cette installation est off-grid, il n'y a pas d'arrivée externe

j'ai vu des videos avec des multiplus mais pas des easy solar,

faudra t il condamner certaines parties de deux d'entre eux (color control ...)?

si quelqu'un a déjà fait un montage ?

merci de votre aide

sneval asked

0 Answers

Three phase solar system to home



Could this type of set up work as a one phase and three phase home solar system? Does this plan have any problems or something to fix?

Im not the best one to create professional electrical circuit diagrams.

All help will be useful! Thank you!

crimu asked

0 Answers

PV Inverter Assistant - unbalanced PV


In the PV Inverter Assistant it says 'Each phase must have the same solar power installed'

So what happens if it is not balanced? If the 1:1 rule is adhered to on each phase will it be ok?


stevo07 asked
pvmaker commented ·

0 Answers

Single phase PV Inverter (AC Out) in a three phase ESS system?

Is it possible to add a single phase PV Inverter on one Multiplus-II AC Out1 in a three phase ESS system, or does it have to be necessarily an three phase PV Inverter in this setup?

The PV Inverter Assistant states load must be symmetrical:

"Each phase must have the same Solar power installed". Is this really a must? I would like to add a small Fronius Primo onto one phase in a three Phase ESS

pvmaker asked

0 Answers

Split Phase 120° with 2 multiplus II on 3X400+N


Here in belgium we are restricted to max 10kw inverters for residential settings. On a three phase system with 3x400+N normally you would use 3 multiplus II's 3000. But in theory you can configure a split phase system with 120° phase angle. So my question is can I use 2x multiplus II 5000 in split phase mode and let the ESS compensate for the usage on phase 3?

Thanks in advance!

siebe-r asked

0 Answers

What is the best solution for ESS on a 3 phase 230V IT (delta) network?

Our house has three phase 230V IT network with no Neutral. (3x63A). All the loads in the house are 1 phase and distributed ca. evenly. I know that Victron doesn't support Delta-network configuration, but what other options are possible? I was thinking out loud:

1) Just put one big inverter on one of the phases and run ESS on only this phase. And move the loads most critical / for optimizing to this phase, and let the other phases live a separate life (no optimalization / backup power on these).

2) Mount 3 separate ESS systems with 3 inverters - one for each phase. 3 cerbo's and 3 completely separate solutions, but powered from the same battery / PV system.

3) Use two big inverters in 120 degrees split phase, and try to distribute the loads on the two main phases, since the third is a virtual phase that draws power from the first two. Run ESS on this.

4) Using a large transformer changing our house input to real, 400V three phase with neutral. I don't like this solution since the transformer consumes too much power due to inefficiency.

Do anyone have any suggestions regarding this? Or other solutions? I know there are other brands which support 3P/230V IT, but I love Victron ;-)

urs4-2008 asked
urs4-2008 edited ·

0 Answers

Fronius not producing ESS AC Coupled

We have a problem with our system for a client. The AC coupled Fronius inverters only supplies loads and doesn't charge the batteries. I've updated the firmware's on all Victron devices, batteries, and Fronius but still does the same.

I followed this guide as main setup: Victron Three phase setup
Then this guide after main guide: Victron Fronius setup
Then lastly the ESS setup with zero feed-in (4.3.11): Fronius Zero Feed-in

The system is up and running, all devices are detected and running as should, except the Fronius's are being throttled.

We first had the system off-grid (Client only later on decided he want's the grid as backup), the grid codes were set to Microgrid 50 and was only using Frequency shifting when throttling, when we tested it like this (About 3-4 days) the system operated 100% correctly, we switched off and left as site was still being established.
A month later the client pulled in the AC supply (from grid) cable and we went back to connect it, I noticed the system didn't throttle the PV when batteries are full because (obviously) the system stuck to 50Hz as it came in from the grid. I changed all grid codes to South Africa (NRS 097) and then I used the Fronius Zero Feed-in guide above to limit the Fronius inverters via TCP. This works and only feeds back minimally, but the PV throttles when loads drop, it shouldn't- it should charge batteries and then only throttle.

The system consists of:
Three phase setup
6x 15kVA Quattro's (2x per phase)
10x SolarMD SS4143 (143kWh)
4x Fronius Eco 27.0-3-S Inverters (1:1 rule was adhered to on DC side)

Any assistance would be greatly appreciated!

francois asked

0 Answers

#1 Device Switched Off momentary

3 phase system,

running 3 x 24/5000 multi plus

No PV system, only Generator,

Can't see a drop in ac voltage on VRM, only current drop as a result of a momentary drop in multiPlus we end up losing an IT rack as the battery pack is slightly too slow to connect, the system works perfectly when dropping the breaker.

Any advice applicated.

eminence asked

0 Answers

Relay assistant: is the load option per phase or whole system power on 3 phase setup?

I have successfully been using relay assistants for various load shedding control on various systems configurations for some time now.

A need has come up on a particular 3 phase Multiplus system (3 x 5kVA) with asymmetric 3 phase load where i need to load shed above a certain load on any inverter. (For example say I have more than 4kW load on one phase and less than 3.5kW on each of the other 2 phases I want to load shed on all 3 phases).

@Guy Stewart (Victron Community Manager) Does the relay assistant "based on load" power compare whole system 3 phase power or only per phase?


If i set up relay assistant on L1 inverter to switch off relay above 4000W (see screenshot) is this 4kW measured against the total system load or only the load for that phase? (i guess i will find out on trial and error - just nice to know before i start "hysterical" starting and stopping of loads :"D)

P.S. "Bold" button on the rich text bar stopped responding :P

kenyon asked

0 Answers

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