Multiplus-II Image


Lynx Distributor Red LED - But Fuse Not Blown.


Hoping I can get some help here, I am installing 2 new Multiplus-II in parallel system and all seems to be working well except i get all LED lights as red on the lynx distributor when I have AC power on and the inverters are charging. I have tested all the new fuses just via continuity test and the batteries are getting charged.

The even stranger thing is this: When I put the 120x2 3000 12v 50a Multiplus in standalone operation, they light will be green, then turn red after a period of time, then green again, but as soon as I put them in parallel and they are both charging the batteries from AC power, the led's on the lynx distributor stay red.... I have the battery protect connected to one slot on the lynx, 2 inverters (multiplus-II) each in its own slot, and the final slot is taken up by my BIM to chassis battery/alternator. The batteries are connected to the Lynx shunt via the end posts (where most people would connect the lynx power in). All the components have shutoff switches in between them.

Any help in understanding the Red LED's when under load would be greatly appreciated. As soon as I turn off the load the led's go off, and only the one green in the center of the distributor is lit. The lynx shunt stays green in any scenario.

Update - Even in standalone when the lynx distributor is under load the lights turn red. I have taken everything back apart and verified every connection but no matter what, under load, I get red lights on the lynx distributor. @Guy Stewart (Victron Community Manager) - Either load from chargers or load from the coach, ie when I turn on a microwave and a heater, it happens every time. I have ordered another lynx distributor to see if maybe it is a hardware board fault? I can't think of anything else it would be... Thanks for any advice in advance.

I have raised this with my retailer (CR for multiplus, and another company for the lynx) and they stated they would open a ticket with Victron, but have heard anything. I think this is an odd one, but maybe Victron staff have ran across this before?

cory cantrell asked
gsymes answered ·

3 Answers

ESS fails after a blackout

My system is composed by:

  1. 4.5 kWp solar array
  2. 1x 150/85 VE.Can mppt
  3. 1x MultiplusII 48/5k (single-phase)
  4. 1x GX Venus
  5. 1x smartShunt
  6. 11kWh 48v lithium battery
  7. External BMS, not connected to the system.
  8. Modbus meter connected to the GX and measuring grid

ESS & Multiplus Configured for:

  • Mode: Optimized w/o BatteryLife
  • External meter on Ac-In, just after the grid connection.
  • House loads on ac-out1, ac-out2 not connected to anything
  • Sporadic car charger on Ac-In (between meter and multi) / Ac-In setup as in use.
  • DVCC disabled.
  • Charge and Inverter limits disabled.
  • Feed-in disabled.
  • Grid setpoint 20w
  • Minimum SOC 30%
  • Battery voltages: Absorption 55,3v / Float 55v / Low shutdown 44,8v
  • Battery capacity 200Ah
  • Lithium system with other BMS (not connected)
  • Mppt & smartShunt configured with the same parameters.

In my zone it's normal for a period of the year to suffer grid blackouts. They can be from minutes to several hours, but I have no problem with quality.

When a blackout happens, the system behaves correctly.
When the grid returns, the multi charger starts itself, sometimes faster than others, but the loads on ac-out1 only receive energy from the grid. The mppt continues to serve energy from the panels, but only for the battery charge and all loads are supplied from the grid.
Also, it seems to be a problem with energy flow management as it's intermittently reporting big loads on ac-in, when I don't have anything connected to it.

The problem persists (waited hours) until the Multiplus is hardware-restarted by completely turning it off, waiting and then turning on again (switch at the bottom)

This is a big problem for me, as I mention there will be blackouts. I like the possibilities of ESS but If I can't solve this, I'll be forced to migrate it to virtual switch, and that's not optimal for the size of my system.

Also I noticed that while the blackout, the charging phase always show "Inverting" and the Victron nodes, mqtt, etc, all output alike. I would like to know where I can report this as an issue, like in some git project. Not reporting the battery charging phase does disallow making automations based on this data. It's valuable for diverters, for example, as the setpoint should be different on every stage.

With the pass of days I'm seeing that the changes/problems are more extense. I'm concerned about two of them:

Before, it charged the battery until absorption at full throttle. Now it charges at low power (@1500w max.) even when more solar yield is available, as it is applying some kind of manager that wants to extend the charge to the full day. That's not good because in my region the available sun is scarce, and I have to get the battery full as soon as possible.

Then there is a strange behaving after the absorption phase. I have Float 0,3v lower than absorption. Before when absorption ended it gently left the battery alone (power between 0 and 20w, and slowly with the normal use it reached float. Now it applies a constant -200w load that is steady for more than 1 hour. I don't know if that's a false measurement (possibly), but the effect is that no other diverting appliances can be used in float, as it always reports negative power to the battery, while loads are successfully supplied by solar.


seriusrod asked
seriusrod edited ·

1 Answer

Allow Charge and Allow Discharge Multiplus-II - not working

What should this mean?


My interpretation is Charging is allowed and discharge is not allowed.

What it really means in my ESS instalation.
"Discharge is not allowed, but charge at maximum current possible."

When "Allow to discharge" is set to NO, the "Low battery"-led starts to flash, and multiplus starts to charge with maximum charge power, it disregards state of charge, it ignores ESS set points... it just charges.

I use the 2-wire BMS assistant with ESS.
The allow to charge works as it should. When NO it stops charging, when set to YES it charges, if ESS grid point allows it.

I am on latest firmware on the multiplus-II and VenusOS is 2.80-ish (same behaviour on lower venusos as well)

Is this not a bug? Am I the only one?

Magnus Pernemark asked
tommas commented ·

3 Answers

Lüftergeräusch Multiplus II

Der Lüfter meines MP ist seit der Inbetriebnahme im Betrieb (Laden / Wechselrichter aktiv) extrem laut und klingt auch etwas "ungesund" (blechern). Ist das so normal?

Das Geräusch erinnert mich an einen alten PC bzw. Server der seit 5 Jahren durchläuft...

behl asked
markussi answered ·

2 Answers

Adding ups- and backup-function to solaredge with byd


i spent a lot of hours trying to find out my best backup configuration, but there seems to be no one having my configuration.

I have a solaredge SE10K-RWS with 14,85 kWp (ONO, so 10kW is ok) with BYD LVS 12kWh.

Now i want to add usv- and backup-function. What i found out is, that 3 multiplus would be the best option.

My highest used current is charging a car with 28A single phase in addition to the house consumption. This high current is not necessary in case of grid failure.

The first question is, If multiplus 3000 can handle that. What would happen if the grid fails while charging with 28A and the current of the house is another 8 A on that phase? This high-amp-charging usually only happens, when solaredge delivers this power.

Can i still send 10kW to the grid or will it be limited to 9kW (10kW to the grid is not often and not for long time) or will the Multiplus 3000 get damaged?

Can i leave the Battery connected to the solaredge and add an second BYD LVS to the 3 Multiplus so i could get additional 5kW AC from solaredge.

Or is it better to connect a single battery only to the 3 multiplus (maybe adding one ore two 4kWh-modules) and disconnect the battery from solaredge.

And at least a 8kVA-generator with good voltage-regulation should be manually connectable too.


suggarman asked
suggarman answered ·

3 Answers

Ground Relay Error 8 with Fronius IG Plus when switching back to grid

Hy All,

we deliverd a new Installation (Number 8) to an "existing" Farm House with a 3 - Phase ESS 15 kVA - Multiplus II System.

There is a Fronius IG-Plus 120-3 running for more than 12 years. So good for now.

Everything is working fine except we start the system in "Island" Mode with an Active IG-Plus. When AC Mains is connected, the System performs its Relais Test and after about 5 Minutes it is going to switch back to grid. Immediately, when switching back we get an Ground Relais Test Error 8.

When starting in Island Mode with a disconnected IG Plus everything is working fine.. after switching back to grid and connecting the IG Plus everything is working like a charm.

When coming from Grid with a GridLost, we also encounter the same problem when switching back to grid.
To make a conclusion.. When the Fronius IG-Plus is "Connected" (we switched off the system, because it starts working after 30 seconds.. so we could not test, if its a problem when standing by connected and producing), we get an Ground Relais Test Error when switching back to grid. (Always)

Whats wrong...

There is no mixed Ground and Netral (We have controlled that several times)

The Multis are showing those ERRORS:

Phase L1, device 1 (0) #44 0x820002
Phase L2, device 1 (0) #15 0x800024
Phase L3, device 1 (0) #19 0x800024

From the wiring...

AcMainSwitch - SwitchOverToGenerator - 100 mA 3 Phase FI - MulitplusII - FI-s to different Loads

the IG Plus is connected:
IG-Plus - LS 16A - FI- 003 A -To The MulitplusII Ac Out

As talking to Fronius Service Personal the have no Idea what s going on, because they say they do not connect Neutral to Ground ... so do we have issues with the 100 mA 3 Phase FI, or the FI 003A connected to the IG Plus?

The System is running the latest Firmware 487.

Unfortunately there is no Support from our Dealer, because they do not have the knowledge.

Have a nice day, always Sun and I hope to get some good feedback...

thank s in advance


Bernhard Matschinger asked
Bernhard Matschinger edited ·

0 Answers

Multiplus II constant overload trip

Multiplus II inverter charger constantly tripping to overload without any loads attached!

less then 2 years old

Ranto Ranton asked
Adam answered ·

1 Answer

Multiplus II 12 v 2x120 - Inversion Power Loss / Power Factor ???

Doing some testing today on a new install and I'm curious if my readings match what others are seeing... Measurements are from both the CerboGX as well as direct RMS readings via Multimeter.

AC Loads around 2400 - 2500W (I start seeing overload light come on around 2500)
DC Load (inverter only) around 3000W (250ADC @ 12VDC).

So, I'm seeing 16-20% power loss in conversion, which would make the power factor around 0.84 - 0.8?

Anyone else out there done similar measurements? Is the MPII power factor documented anywhere?



thechad asked
thechad commented ·

1 Answer

SOC not recovering to 100%

Hi all,
i have several ESS instalations not recovering the SOC after BULK.
For example here on the Photo.


In setup we have 1h bulk and after bulk 95%.But its not resetting to 95% or even 100%.
Maybe someone has an idea.

best regards

Michael Schmidt asked
holumiedey answered ·

2 Answers

Victron Multiplus-II 48/8000 3Phase?

Is it possible to switch a Victron Multiplus-II 48/8000 in 3 phase? (3x Victron Multiplus-II 48/8000)

for the 3000 and 5000 models this is possible, but for the 8000 I can't find the right info.

alex019 asked
markus answered ·

1 Answer

Which Inverter/Charger for RV - 50 Amp

Hi guys!

I could use some pre-purchase help with my parents RV. It has no inverter. The RV has 30 & 50 Amp service. You can plug it into either. It also has an automatic transfer switch between shore power and generator.

We wanted a 3000 watt inverter so I was going to go with a Multiplus 12v/3000 (we have two 6v Trojan batteries configured as 12v)

BUT....from what I've seen this could be a problem with the 30 or 50 Amp service (depending on what you are plugged into).

So would it be better to use the newer Multiplus II 3000 ? Would this allow seamless operation whether plugged into 30 or 50 Amp service?

Your help is appreciated, the dealer does not even speak English well ! :)

bob-kones asked
ejrossouw answered ·

1 Answer

MultiPlus-II 2x 120V PowerAssist Only Line 1???

When the new MultiPlus-II 2x 120V was announced, I thought it would do power share on both lines. But, reading the manual, it appears to only do line 1?

PowerAssist takes the principle of PowerControl to a further dimension. Where peak power is so often required only for a limited period, the MultiPlus-II will compensate insufficient generator, shore or grid power with power from the battery. When the load reduces, the spare power is used to recharge the battery (available on L1 input only).

This is what my current GoPower inverter does and it's essentially useless in an RV installation.

Can someone validate / clarify this?



thechad asked
thechad answered ·

3 Answers

NEGATIVE power reading on ShorePower Line 1???
I finally got my CerboGX to see all of the components in our system: Multiplus II, 2x smart solar controllers, smart shunt.

How is it possible to have negative power on Line 1???  

FWIW, I was also seeing negative amperage numbers directly from the multiplus ii via the BT dongle... So, it's not the release candidate firmware on the CerboGX...

Any ideas?


thechad asked
Alexandra answered ·

2 Answers

Off grid system upgrade, need another inverter/charger- with one should i go for?

I need info what Inverter/Charger should i buy for my setup.
I have big problem that Victron Distributors won't help me at all.
They just never gets back to me...
What i have already is off grid 100%.

I have connected and running for many years;
15x : CS6P-250 panels
Powerbank: OPZS 130a 56V (2.25v batteries)
Mk3 to USB
Diesel power generator 8KW

What i dont have connected and i bought already:
10 panels JAM60S20-380/MR
Powerbank: OPZS 24V (2.25v batteries)

What i would like to do, connect new panels and new 24v powerbank would be nice to hook it up into 1phase so i could pull more power out of socket etc.

Help me please...

my inverter is:




magicmike asked
magicmike commented ·

4 Answers

Multiplus II - AC Input suddenly 0 Watt on GX Touch 50 when connected but battery is charging


I have a strange error on my GX Touch 50 display.

I am using a MultiPlus II 48 V / 5000 / 70-50 Inverter and Pylontech batteries with a Cerbo GX and GX Touch 50 in one system.

Up to now all systems were working pretty fine. But this one system makes some mistakes.

Inverter is up to date (v481) and Cerbo GX too (v2.66).

When I just switch on AC Loads, then I can observe on my display the Watts which the system is using, see here:


But when I add AC Input (Grid), then suddenly both windows are on 0 W. Grid connection is also fine.

But looking at the battery its charging (990W). I don't get it. Settings are fine, used all the same for all the systems and in others it worked fine.


Also when I connect to that directly a cable (USB MK3) to the inverter and start VEConfig, I see in the monitor a number for watts..

Maybe someone could help me. Other systems I am doing exactly the same and are working and show me e.g. 1000 W Grid AC Input and AC loads (if I activate).

Thank you.

markusschwientek asked
kamikaze answered ·

3 Answers

Multiplus Compact 12/2000/50 Fuse Type not specified

Looking at the manual for this unit under section 4.2, we don't see recommended fuse type. Given surge current, inverter efficiency loss, and true wattage, we were going to use a Class-T fuse. Why has Victron not suggested a specific fuse type? Especially one with a higher AIC. What fuse type have others used?

Thank you.

ve-user asked
ve-user commented ·

1 Answer

Trick for lower input current limit?

First let me describe the system I am working on as it might be a bit unusual.

The system is installed in an Airstream trailer for powering a "trade-show" demo and HVAC system for public demos. Typically the loads draw ~4kW continuous, 8kW peak. The use case is to plug the trailer into either an EV charge point OR a 50A RV service (with an EVSE) overnight, tow the trailer to the site for the day and let it run all day, then tow it back to a grid connection overnight.

Additionally, we wanted the ability to "trickle-charge" off a 15A 120V outlet.

  • 28kWh of 48V batteries (12x Renogy 50Ahr LiFePo4 "smart" batteries)
  • 2x parallel Multi-Plus II 48/5000/70-50 230V
  • 6kW of solar with 2x Victron MPPTs (not yet installed).
  • Lynx distributor and Lynx CAN shunt with a Cerbo (not yet installed).
  • AC output: 100A Victron autotransformer feeding split-phase to the panel
  • AC input: manual transfer switch to select between a J1772 inlet (up to 50A at 240V) or a 2:1 transformer to "trickle charge"

The problem is that sometimes we want to use a 15A 120V outlet with the PowerAssist function. We would like to pull ~13A from the outlet (6.5A@240V, at the input to the Multi-Plus-IIs) and supplement the rest of the ~4kW load with power from the batteries.

The minimum current per Multi-Plus is 5.7A, or, on the other side of that transformer, 23A for both.

How can we make this work? If we disable PowerAssist, we can decrease the current limit further but it will not otherwise do what we want, correct?


willem-hillier asked
Alexandra answered ·

1 Answer

Multiplus 11 AS.NZ 4777.2:2020 Approval

Will the Multiplus 11 conform to the updated AS/NZ 4777.2:2020 Standard?

Has it been submitted for CEC approval?

Trying to plan out some jobs as the deadline is approaching in the December.


damovic asked
Johnson Lee answered ·

1 Answer

Can a Multiplus II be started without battery connection?

I just bought a Multiplus II 48v/50VA and tried to do the setup via VictronConnect. I connected power to AC-in and had no connection in AC-out-1 and AC-out-2.. I didn’t connect it to batteries (they have not arrived yet). When I switched the Multiplus to ON, it stayed powered on (with Low Battery LED on) for a few seconds and then tripped my 32A circuit breaker. When I switched it on as charger (Main LED flashed), it also tripped my circuit breaker after a few seconds.

The manual doesn’t mention whether the MPII can be powered up without battery connection but I found this video (at 1:27) mentioned that it can be powered up either via AC-in or battery.

Howerer, it seemed that it is not the case from what I got.

Can a MPII actually not be powered up solely via AC-in? If it is the case, where can I find the related documentation. Or, there is some problem with my new MPII?

Thank you.

elel asked
Kevin Windrem commented ·

2 Answers

Bug in Multiplus 2 when switching to Float

I use three MultiPlus-II 48/3000 in grid-tie ESS setup.

I charge the batteries to 56V (absorption), it sits there for a while while batteries balance.
After a set time it enters Float at 55.40V.

When the multis change to Float they discharge at maximum inverter capacity for a few seconds, in my case over 6000W.
On a sunny day when my PV inverter is already exporting 15000W, an additional 6000W is a little too much.
The jump from absorption to float ignores grid-set-point, it ignores the ramp up/ramp down settings. It goes from 0 to MAX in a millisecond.

I cannot see this discharge in any of the widgets in vrm, but it is there, trust me. I see it in real-time if I look at vrm and I also see it in my other monitoring system. 18900W was exported at 11:27 (5/6-2021) exactly when multiplus went into float.

It is not a one-time thing. It happens everytime absorption changes to float.



I guess discharging to reach float is by design, but could it be done a little slower?

Magnus Pernemark asked
Magnus Pernemark commented ·

2 Answers

Multiplus II GX restart problem

My new MP II GX still restarts for a out 1-2minutes. I try to reset it and new firmware 2.73. Check video:

Battery 16s4p Nissan Leaf gen 1, and BMS Batrium

Anyone can help me? :(

kamikaze asked
marekp commented ·

1 Answer

Open AC-input relais in ESS mode on MultiPlus-II

Is there a way to open the AC-input relais on MultiPlus-II by a command submitted to GX-device or with an input signal on MultiPlus-II when using ESS- instead of a virtual switch application? I would like to avoid placing an additional motor-switch or relais in between grid and MultiPlus device.


thomasw-1 asked
thomasw-1 commented ·

1 Answer

Actualizar firmware multiplus II GX

Tengo un Multiplus II GX, que no puedo actualizar alguna forma de que pueda hacerlo, envio captura de pantalla


testa asked

0 Answers

Sustain current too high?

Hello Victron fellows,

I have set some Li ion with Victron inverters, always for self consumption with PV inverters, but this one is cracking me up. This system consists in three 48V Multiplus II 3000/35 as a three phasic system, and an ESS assistant is set. The sustain voltage is 43V and cuttoff around 42V. The modules have a low SOH, but the system should work anyway. It charges and discharges correctly, up to the point where my BMS disables allow to discharge at around 48V, because there are low cells (it should discharge to less than 42V if it was good).

Then, Sustain mode is active and the current goes UP TO 90A. Of course when this happens the voltage raises quickly, the allow to discharge comes on again and it goes to Discharging mode. Repeating the process endlessly - Even without PV POWER, that means it consumes a lot of power.

My question is, why does it go up to 90A, since sustain mode should be 5A per unit and how can I solve this?

Thank you very much!

jorge-folgado asked
sedlons answered ·

3 Answers

Power assist does nothing, never activates

Hello, I have...

Dual Multiplus 3000 currently running in parallel on 30 amp shore power

bmv 712

cerbo gx

touch 50 screen

800 amps of lifepo4

Power assist on in both units

When I set "input current limit" to 15 amps and I run 20 amps of load the power asssist never helps out. The system just keeps charging the batteries. It never actually shows the correct amout of amps bieng drawn. Can this be corrected?



rvlivinglife asked
Kevin Windrem answered ·

1 Answer

Multiplus II not showing AC Input on Cerbo error message AC-Input: Not available

Just connected my new Mutiplus-II 24/3000 to my Cerbo today however I am not sure why I am getting the error "AC-Input: Not available" and it also registered an alarm, any assistance appreciated.



jcottis asked
thechad answered ·

2 Answers

Multiplus no load watts

I’ve been running tests and keeping an eye on my power usage and wondering why the system seemed to use so much at rest with no loads. With everything turned off, all loads breakers off except the Multiplus, the BMV is saying 29 watts being used. The spec sheet says the Multiplus should use 20 watts with no load. Is this normal? Does anyone else see this high of an “at rest” usage? Multiplus 3000 va

jake-ote asked
Alexandra edited ·

2 Answers

Can I use a Multiplus II + CT100A to measure Solar Inverter connected on AC OUT ?

I read the CT100 is to measure the AC in to/from Grid with Multiplus II but can I use the CT to measure a solar Inverter coupled AC OUT of a multiplus II ? Will this do the same than the old Current Sensor on AUX ? Or have I to use this current sensor if I want to see the solar inverter power reported on GXCC ?

rodolphe-yonnesolaire asked
guillen84 edited ·

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

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