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Two quattro's in parallel and 3-multiplus in 3-phase


I have 2x Quattro (2x15000) in parallel and would like to install 3x Multiplus 5000 in 3-phase.

This to seperate my house (Connected to the Quattro) and my utility shop (3-phase mulitplus).

Can I connect these two setups to the same battery pack (BYD BMS lithium)?

Can anyone give me some advise if this is possible or not?

Thank you

jean-paul-1 asked
Alexandra edited ·

1 Answer

Using 2 BlueSolar MPPT 100/50 in parallel

Hello dear community,

Wish you a happy new year!

I am an electronic engineer, but completely new to solar stuff.

I have 2 BlueSolar MPPT 100/50 connected:

1) 4x similar solar panels in parallel, each panel about 250 watt, vmp about 30vdc, imp about 8.4A

2) 4x of same solar panels, but different connection, combination series-parallel - 2 + 2 in series and both groups in parallel, delivering about 60vdc (2x vmp).

Battery bank is 24vdc, not sure about capacity.

Question is - can I connect the OUTPUTs of both MPPT 100/50 in parallel to the same battery bank?

Thank you, Puiu

puiu-chiselita asked
puiu-chiselita answered ·

3 Answers

Configuration triphasee et parallele

Bonjour tout le monde,
Si j'ai 6 inverters quattro de 10 kVA que je veux mettre en triphase et en parallele, en arrivant sur Ve.Bus system configurator, dois je les mettre en parallele deux a deux et ensuite les mettre en triphase ou je dois les mettre en triphase trois a trois puis les mettre en parallele?

Merci deja pour vos reponses

Gedeon Paris asked
Gedeon Paris answered ·

5 Answers

whats the accessories that are required to connect three quattron 15kva with 4th 12.5kva furious inv in "Ac coupling". "using ve.bus bms or color gx or..."

ما هي الملحقات المطلوبة لربط ثلاثة Quattron 15kva مع Inventious Invent 12.5kva الرابع في "اقتران التيار المتردد".؟

"باستخدام VE. bus BMS أو Color Control Gx أو ..."

pal-robot asked
Paul B answered ·

1 Answer

Connecting a generator to 2 x 5kw quattros (wired in parallel)

Hi all. I'm planning to connect 2 x 5kw quattros in parallel as I need both 120v and 240v.

I have a 6kw 240v generator. Can I connect it to both inverters? I would really appreciate any guidance or a wiring diagram example


vovanenok asked
snoobler commented ·

3 Answers

2 Multis in Parallel

My system:

2 x MultiPlus 48/5000/70-100

8 x Delta Gel Batteries GX12-200 (12V, 200 Ah)

48 x 150W Solar panels

2 x BlueSolar MPPT 150/70-Tr/MC4

Color Control GX

My problem: 2 parallel units from time to time a few times a day switch to inverting without any reasons all of a sudden and sometimes are overloaded, when the real load is 2kW only – that’s what I call “moments of instability”.

I have unstable weak AC input (house is in village with rather weak transformer, which cannot quickly sustain stable voltage when someone switches on high load more than 2kW).

When I had only one Multiplus and updated it with the latest firmware 3 years ago, it started working excellently without overloading itself and without switching to inverting every time I switched high load. It worked perfectly until I had to upgrade the system and installed the 2nd Multiplus in parallel last year. Even now when I experiment and use only one Multiplus after programming it to standalone mode, it works perfectly. But when I use 2 units in parallel – my system keeps on switching to inverting – not all the time, but from time to time. And in these moments of instability I sometimes see that power, taken from my batteries, reaches 6kW – that’s what at least shortly indicated on CCGX and in reality it can be much more. This is crucial for my batteries and 2 out of 8 are dead by now. Yesterday I checked voltage on each battery under 1kW load: 2 indicated 10 V, others – 12.1V. So, I am prone to think that instable parallel work of Multiplus units caused death of batteries, since they are not intended to work in mode of sudden short and relatively high load, which all of a sudden occurs during these moments of instability.

I carefully read everything written here:

My system is up to date, all AC wires between Multiplus units and joint point are equal in size (2.5 mm^2) and length (750 mm) – yesterday I replaced 6 mm^2 wires with 2.5 mm^2 , trying to avoid over-dimensioning , but it did not have any result.

Dear Victron team – please admit that parallel systems were not supposed to work with weak AC input and I should replace my 2 Multis with one Quattro for 10 or 15kVA. I do not know what else I could do - everytime I wait for the new firmware with hope that it will solve my issue with parallel units as it did 3 years ago for stand alone unit, but all the last firmware files, including 2624473.vff, make no difference.

Alexander Ushakov asked
Alexander Ushakov commented ·

3 Answers

Parallel Quattros split phase ground relay setting

I have an off-grid system (in US) using (2) Quattros (48/5000/70-100/100 120V) configured for split phase parallel operation. Hence, each Quattro is providing a 120V leg which creates a 240V system.

My question concerns the NEC (National Electric Code) requirement for bonding the ground and neutral. NEC requires the ground and neutral to be bonded at the "service entrance" and that this bonding should only be done in 1 place. Each Quattro contains a relay that bonds the ground and neutral by default. If both Quattros are configured to enable the relay (i.e. the "Ground relay" box is checked) this would seem to bond the ground and neutral in 2 places. Should I enable the Ground Relay on both Quattro's or only on 1 Quattro?

tbratten asked
snoobler answered ·

1 Answer

Layout of a PV Storage System


I am planning a storage system (3 phase with Multiplus II 5000VA) for my existing two (10 kW and 17.5 kW - borth Fronius Symo) PV systems. The pv systems are located on a freestanding garage (ca. 40 m away). The meter box is in the house. Near the meter box is no space for the storage system. The storage system can be placed in an annex.

Layout 1:

The easiest implementation is given by following layout.


But, I think, it is not possible with the Multiplus II. Is this right? K4 is used to guarantee the 1:1 rule.

Layout 2:

In this system layout, the Multiplus is either in the parallel or in series. The switching is done by the relays port of the Multiplus in connection with the contractor K11 and K3. The 1:1 rule is guaranteed by K4.


The advantage is that at failure of the Multiplus the supply of the house is still guaranteed. Further, line losses is minimized. What is your opinion about it?


everest asked

0 Answers

Connecting two Orion-Tr Smart converters in parallel

I want to connect two Orion's in parallel to charge twice as quickly when driving. However, I've read that in order to do this you need to connect a 'hot wire' from the ignition to manually turn the units on, as using the voltage sensing can cause issues if there's a slight lag between the two units, causing one to not turn on.

I understand how to connect the two units in parallel, but how do I connect to the ignition to act as a switch? I have a Mercedes Sprinter, not even sure where to start - thanks in advance! I presume there's no other way to charge quicker than 30A? I have a Euro 6 engine so can't use a standard VSR.

nancybeaumont asked
nicetrip answered ·

2 Answers

MultiPlus II ESS: Grid parallel vs. Grid in Serial Mode


What are the Pro and Contra for each other mode?

So that i know right now is, on Parallel-Mode you need the Meeter.

If i got an 48V/3000VA and the requested Power is more then 2400W, what happend in the in-serial-Mode then?

What is happening in both mode if the Grid fails?

If i wanna use my Battery and PV-System with MPPT at first and if the Battery is on setted lowest SOC, so the PV-System should recharge the Batteries and the grid is now goes thru.



timmbo asked
Rob Duthie commented ·

2 Answers

MPPT 75/10 and blue smart charger in parallel?

Hey, i'm currently working on a small mobile solar station with a Victron Li-Ion-Battery for education purposes. When the station is outside it should yield its energy via an solar panel and the Victron MPPT charge controller. When not in use, it will probably stay inside for a longer time. For this case it would be great if the battery coulld be charged via the Victron Blue Smart charger off the grid. Is it possible to connect both devices, the Blue Smart Charger and the MPPT solar charger, in parallel to the Li-Ion battery? (VE.Bus BMS will be installed)

To my understanding, since both devices work in the same output voltage range, this shouldn't be a problem.

Many thanks in advance


andi asked
Mike Dorsett commented ·

2 Answers

Ladegerät parallel zum victron mppt 250/100 möglich?

Hallo Leute, ich habe einen victron mppt 250/100 Laderegler im Betrieb. Das Problem ist, das meine Module die Batterien im Winter nicht vollständig aufladen. Somit würde ich gerne einen netzausfall spannungsabhängig von den Batterien simulieren und somit einen generator automatisch starten, der dann mit einem parallel geschalteten Ladegerät die Batterien aufläd. Ist das technisch ohne Schäden am mppt Laderegler davon zu tragen möglich? Erkennt der Laderegler in diesem Moment die Spannung und schaltet sich ab? Kann es dabei beim parallelen laden zu einem Kurzschluss kommen?

danidlaus392 asked
steffen-graap answered ·

1 Answer

How to connect a Phoenix Inverter Smart 48/3000 in parallel?


I want to add a Phoenix Inverter smart 48/3000 to the already existing one same model. Is it possible to place these inverters in parallel? Can any on show a diagram for placing them in parallel?

Are there challenges with firmware?

Do I need more safety fuses?


bluewally asked
Matthias Lange - DE commented ·

2 Answers

How to charge a starter battery from leisure battery?

Goal : I want to use my vehicle's indoor lights and ventilation during the night (3A 12V).

Setup : I currently have an independant solar and battery setup (700W solar 160AH of usable LiFePO4 battery)

Proposed solution : I think I could use an Orion-TR 12/12-9 converter taking power from my leisure battery and use the cigarette lighter circuit to charge the starter battery (15A fuse so everything seem alright). (The vehicule manufacturer said it's ok to let the car at "on" for long periods if I charge the battery.)

- Will it work?

- If I start the engine and the alternator is working at the same time as the converter, will it cause problem? (alternator and converter in parallel, seems ok from the manual from the possibility of paralleling multiple converters)

- Have I other solutions?


mathieu-dubuc asked
scraggs edited ·

2 Answers

Orion TR smart 12-12-30 working in parallel ie. twice as productive - Is this actually possible Victron?

I have bought 3 x Orion 12-12-30's but if they are not made to work in parallel, please let me know so I can get a refund before my return receipt expires.

eg. Do the software/hardware allow without conflict? etc

(Mercedes Sprinter 200amp alternator, multiplus 3000W, 300ah Victron battery etc)

(Or is a different alternator required?)

Kind regards


mike-thornton asked
arghhh40k answered ·

1 Answer

Unbalanced load on Parallel 2x Multiplus-II 5000/48 system.

HI All.

I'm hoping to get some assistance. I have been struggling to get my 2x multiplus-ii 5kw units in parallel setup correctly. Sorry. Let me phrase that again. They are set up precisely, in parallel, according to the user manual and is running, but the one always supplies all the load and goes into overload the moment I start pulling more than 5kw, the other unit does nothing the entire time.

When my system goes to pass-through mode, I can see that both AC cable runs thought the individual inverters are carrying the same amount of current. I have Volt and Amp sensors on both input and outputs of my multis to confirm this.

On the DC side, I have double-checked every connection, cable type and cable length, and places DC shunt current sensors inline with both inverters. The resistance through both DC runs should be very close to exactly balanced, but the one inverter will carry 80 to 100A (55V system) and the other inverter is sitting at 0.03A.

To make sure it wasn't anything to do with DC cables/system, I swapped the inverters around on the wall and kept everything else the same. The problem then moved with the inverter.

So my question, can anyone think of something else for me to test/configure/do? Or is it a faulty inverter.

Something I have noticed is that the inverter that never carries any load is disconnected from the shared AC bus, it fails with overload immediately, and then takes down the whole parallel system. It will not start again unless it is corrected to the shared AC bus, it just ends up in a overload loop and resets.

Lastly, I have upgraded my multis to the latest 469 firmware.

PS. Here is my .rvms file to have a look at my configured setup.

Any assistance would be appreciated.



oliverclaude asked
mike90 answered ·

7 Answers

parallel MPPT charger, but not charging simultaneous

Hi all,

I've expanded my system with one additional Charger and new Panels, loading the same batteriebank.(24V, 660Ah OPzS),OffGrid

Old one: BlueSolar MPPT 150/70 ve.can, Firmware 2.05, charging from 6 Panels/260W
Additional, new one. : Smartsolar 150/70 ve.can rev2, Firmware 3.02, charging from 6 Panels/280W

Both chargers are connected with ve.can to a GX control. I can see them also in VRM-Portal. Both chargers with same default settings (no2). They are switching simultaneosly from one mode to another. But the 6 year old bluesolar charger ist only charging as expected, when I deactivate loading of the new one. Why do they not charge together? Maybe the two chargers are not compatible?

I've built up the system in southern Greece by my own in lack of a victron vendor near Kalamata. Now I'm lost.

Thank's for your help


mstoeger asked
Daniël Boekel (Victron Energy Staff) commented ·

4 Answers

Different charging sources - simplest separation way


I have a question about the currently used methods - what is the best and optimal method of separating power sources. I have on yacht following set of charging devices:

1.2x alternator 12V 80A on engine
2. Victron Multiplus 12 | 2000 | 80-50A
3. Wind/solar charger - output max 40A (other manufacturer)

Then I have 3 battery banks:
A. 1x 12V 120Ah standard battery - starting batt.
B. 2x 12V AGM 110Ah (Victron) - bowthruster and winch
C. 3x 12V AGM 110Ah (Victron) - house batt.

Please advise how is the optimal solution for connecting this different charging sources. I think to use three AgroFET 100-3 or 200-3 separators for each charging source. But maybe experienced users can advice more optimal method which control the charging current from different sources?

Do you think it is advisable to also separate the alternators and treat them as two separate power sources.


elektrotechco asked

0 Answers

How to balance 2 MP-IIs in parallel

For last 3 months I trying to set-up 3 phase/parallel system out of one EasySolar-II and 5 MultiPlus-IIs.

First, in June 2020 I purchased ES-II and 2 MP-IIs and set-up my 3 phase system.

After couple months I realized that 2.4kW per phase is not enough for my house.

Decided to add 3 MP-IIs in parallel.

Asked my Victron supplier if there is a MP-II still compatible with my MP-II for parallel operation.

In turn he asked Victron the same question and got the positive answer.

"There is no problem to connect the actual produced unit in parallel to existing. The only thing is - firmware must be identic (which means that the units are identic also)."

At the beginning of 2021 I received 3 new MP-IIs.

To make this story short, after setting all up I have a problem with load balancing in all 3 parallel channels.

All wires on the DC and AC are equal lengths from the point they split to master and to slave.

On DC side wires are 35mm2 (around 50cm long from the split point) and on the AC side 6mm2 (around 60 cm long from the split point).

FWs are identical.

I am getting the following results when each phase is, one by one, loaded with 2.4 kW resistive load.

L1 Total 66A, Master 38A, Slave 28A

L2 Total 54A Master 32A, Slave 22A

L3 Total 55A, Master 32A, Slave 23A

Any suggestions how to make the currents equal?

The stickers on the boxes show the model numbers and part numbers of the first and the second batch.



marekp asked
Guy Stewart (Victron Community Manager) commented ·

3 Answers

Einfache Installation im VW Bus

Guten Tag zusammen

Ich würde gerne eine sehr einfach Installation für meinen VW Bus vornehmen und bin mir nicht sicher ob das was ich mir vorstelle reicht.

Ich dachte an eine Lithium Batterie 12,8V/100Ah - Smart. Laden würde ich diese gerne ganz einfach über ein Orion-TR Smart 12|12 - 30 und parallel einen bestehenden MPPT 100 | 20.

Für den Entladeschutz sollte der LOAD des MPPT Laders reichen.

Kann mir jemand sagen, ob das Funktioniert oder ob ich da noch ein Batterie Managment System benötige?

Besten Dank und liebe Grüsse


schurmak asked
schurmak commented ·

1 Answer

Multiplus 2 as second storage system with zero control possible?

Hello all,

I have a technical question for you.

I already have a PV system with SolarEdge SE8K (the new one without display) inverter and a Senec V2.1 storage with 7.5kw battery.

Please do not tell me if this makes financial sense or not, I know it does not make sense :-)

But you can suggest me a cheaper / better solution.

Current state

The Senec storage has already a zero control at my house power connection (ergo I have a consumption and too little PV pushes the Senec battery power after / If I have PV surplus and the battery is not yet full the Senec is charged / etc.)

- I would like to install an additional independent second battery in my house.

- Planned here would be a Victron Multiplus II 48V 3000 watts

- The Multiplus together with a new to be purchased EM24 should also create a zero power regulation

- If that runs cleanly, cancel the parallel operation in 6-12 month and sell the Senec storage

The goal is

- when my Senec battery is full and the zero regulation from the Multiplus / EM24 detects a feed that my MultiPlus charges the battery pack on the Multiplus

- if my Senec delivers power to the house grid (e.g. at night or at noon while cooking) and it does not manage to cover the power demand or is empty, that my MultiPlus II / EM24 detects a grid draw, the Multiplus also delivers power to the house.


- Would this be possible with a MultiPlus 2 and EM24?

- Can I set the MultiPlus 2 so that it does not start at 20 watts at the house connection and regulates to zero but at a higher threshold value, say only from 100 watts reference / feed? The background is that the two zero controls of the Senec and MultiPlus should not work against each other.

Why the whole thing?

I am extremely dissatisfied with my Senec and want to build a parallel battery, observe this over max. 1 year and then throw out the Senec. And because I have maximum flexibility with a MultiPlus (expand battery / etc.).

Many greetings,


PS: hope you understand my terrible englisch, normaly i speak germany

willi9974 asked
willi9974 answered ·

3 Answers

Using LiFePO4 Battery 12,8V/300Ah for a large battery bank


I understand for a 48V system the max number of LiFePO4 Battery 12,8V/300Ah is 20 units (4 series by 5 parallel). For a PV system that requires 220kWh in battery bank can can I use multiple sub battery banks of 20 units?

dgmar-ni asked
iand answered ·

2 Answers

Multiplus or Quattro in parallel cascade - How do they operate to cover increasing loads?

Just for the sake of clarity... ( i thought i understood this - but as ever the info is grey or not specific)

Multis or Quattros working in parallel for a larger output capacity. (single phase)

Do the paralleled units mirror each other and operate in the same fashion


Is it a cascaded arrangement, where the master is loaded up first, then the second unit starts to come in to cover the load... and so on....?

And then so.....

Shore / generator AC input

Can this be connected to the Master alone , or does it have to connect to each paralleled unit ? (there are schematic examples for both arrangements - ie. two AC sources, but then other information "infers" symetrical connections required.) There is the note about the shore power setting needs dividing by the number of conencted units.



Chris asked
Alexandra commented ·

8 Answers

Mehrere Landeregler 75/15 parallelschalten?

Aber kann ich ohne einen Master oder Slave zu bestimmen und ohne Anbindung der zwei Laderegler Victron 75/15 die beiden Laderegler an eine Lithiumbatterie anschließen?

Anders ausgedrückt: Brauche ich dazu irgendeine intelligente weitere Verdrahtung der Laderegler mit einer Logikschaltung wie CAN-Bus, oder reicht es aus, wenn man die Ladeausgange des Ladereglers jeweils mit den Polen des Liontroakkus verbindet?

photov21 asked
richi1230 answered ·

1 Answer

Search Mode for four Multiplus II in parallel + split phase (2+2 configuration)


I am looking at purchasing four multiplus II 48/3000/35-50 120v to put in a 2+2 configuration -- 2 parallel unites on each phase of a 240v split phase. I'm primarily going this route over a larger 230v Quattro + autotransformer due to the significantly lower zero load draw (52w for 4x mutiplus II vs 110w for a 15kva Quattro).

With low power consumption in mind, I can't find a clear answer to whether or not parallel / split phase muliplus II units can be configured to go into search mode under zero load conditions. This would bring my standby power draw down to 12w which would be excellent.

I know the manuals state AES mode does not work in a non-standalone configuration, but what about Search mode?

yld asked
yld edited ·

2 Answers

Running 2 x Multiplus 2 48/3000 in a single phase setup with ESS

Hi, I am having toughts of running 2 x Multiplus in paralell with a single phase system, and maybe expanding up to a total of 4 later on. Using 1 source of single phase AC (230V) from grid.

I have a couple of questions:

  1. When running ESS, can both Multipluses feed back into the grid (doubling the normal feedback contra using only 1)?
  2. The transfer switch when grid is on, will that be "duplicated"? When I use 1 multiplus, the transfer switch is 32A when grid is connected. When I use 2 in paralell, will I get the same as 2 x 32A transfer switches? Or is there something im missing?
  3. My phase coming into my house is fused with 63A, therefore I would like to use as much as possible from that before supplying from battery (powerassist). So using 2 x 32A fuses (1 for each multiplus) should in theory give me 7360W pr multiplus of grid use, and 2400W of non-grid use? Or did I misunderstand the concept of transfer switch?

    Thanks in advance :)

lassestu asked
basil katakuzinos commented ·

1 Answer

SmartShunt in Parallelschaltung - Wohnmobil

Guten Tag,

ich habe mir den Victron 500A/50mV - SmartShunt gekauft und möchte diesen in meinem Wohnmobil einsetzen.
Aktuell habe ich zwei Batterien parallel geschaltet, an denen der Verbraucher am negativen Pol einer Batterie und am positiven Pol der anderen Batterie angeschlossen ist.
Den Verbraucher habe ich einfach als BlackBox dargestellt.
Nun habe ich aus der beiliegenden Anleitung versucht den SmartShunt-Aufbau auf meine Gegebenheiten abzuleiten. So möchte ich die negative Leitung meines Verbrauchers an "Load Minus" anschließen und "Battery Minus" am Minuspol der Batterie. Da in diesem Fall wohl Bilder mehr als Worte sagen habe ich versucht das zu visualisieren:


Wäre mein Aufbau soweit richtig?
Gehe ich richtig mit der Annahme, dass dieser Aufbau beide Batterien misst, ich durch den parallelen Aufbau also quasi beide Batterien als eine Batterie interpretieren kann?
Beide Batterien sind auf 12v ausgelegt, sodass die Parallelschaltung diese 12v beibehält.

Vielen Dank im Voraus
Mit freundlichen Grüßen

pdr123 asked
netrange answered ·

1 Answer

Any known issues with firmware 430 on a Multiplus 5kW ?

Two 5kw Multis operating in parrallel - single phase system.

Bench configured and all was well. However, while loading the system up in anger on site, some strange things happen. Master goes into overload and the slave bugs out.

It was looking like they were working together as you woudl expect - i.e. mirroring each other.


When generator is operating - the Multis seem to load it up to around 300w then they trip again on overload.

Cabling is as near as damnit same lengths.

Chris asked
wkirby commented ·

2 Answers

Paralleled Battery Wiring Order for Lynx Power In/Distributor


Does it matter how I wire my 3 LifePO4 batteries to a Lynx Power In/Distributor as far as the order of positive/negative connections of each battery from left to right on the Lynx?

In other words, should the positive connections be connected to the busbars in reverse order of the negative connections to reduce imbalanced current draw of the paralleled batteries?

Examples that have caused my confusion:

From 'Wiring Unlimited'



From Lynx Power In Manual - Design


If I wire like the 2nd reference picture (from the Lynx In Manual: system design) than the current flow would go through the furthest right battery more than the furthest left battery, hence why 'Wiring Unlimited' (first picture) recommends having the flow go diagonally through the battery bank. So shouldn't the second picture show negative/positive cables connected in reverse order of each other? So confused.....

Max amps through my entire system will be 300amps

Thank you in advance!

randy-reyes asked
randy-reyes answered ·

1 Answer

Do I need a fuse here?


I have my 12v side already setup in a van conversion and I'm about to add the MultiPlus 3kw.

I have 3x 200ah batteries with 300amp MRBF fuses at their terminals, in parallel brought together with 120mm2 cable to battery posts.

From the posts, 120mm2 cable connects the bus bars.

The MultiPlus will connect to the busbars via a 400amp T Fuse and 120mm2 cable again.

Should I also have a 400A T Fuse between the battery posts and busbar?

My original wiring diagram had this, but I then opted for the terminal fuses, and an electrician said the extra 400a in the single cable from the post therefore wasn't necessary. I'm now thinking that single cable is not fused correctly (as the 3x 300A MRBF fuses combined are too high) to the bus bar, except for the fuse between busbar and MultiPlus which is (I believe) the only route for that amount of current to run without blowing another much smaller fuse.

Thanks in advance!

And thank you all for your contributions across this whole community, it has been very useful in my learning.

centaur16 asked
centaur16 commented ·

2 Answers


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