Two Multi 12/3000, two shore power inputs, one Cerbo GX

I have a customer telling me the following is possible, but I'm not seeing how it's possible...

This is in the USA.

Customer has a circa 1989 house boat with two 30A shore power inputs. He has a generator that outputs 120V/240V. One shore power input and one leg of the generator go into a single manual transfer switch. The output of the transfer switch feeds an AC load center that powers one half of the boat (the front). The second shore power input and second leg of the generator feed a second manual transfer switch, which feeds a second AC load center that powers the other half of the boat (the rear).

Forget the generator for a moment...

This customer says he has a friend who has two Multis, two shore power connections, and ONE Cerbo GX with his house boat with two 30A shore power inputs, one feeding each MultiPlus.


1. Can I feed each Multi with two different 120V 30A inputs that might be in phase or out of phase, and when on shore power have each Multi pass it through to its respective AC load center AND be controlled with a single Cerbo? This doesn't appear to work when I test it in the shop with the Multis configured in single phase / parallel.

2. If I configure them in split-phase (2 phase 120 or 2 phase 180), then I could feed each AC load center from one of the phases, but since I don't know what the phases will be coming from the two independent shore power connections, I don't think this will work either.

I've told the customer we can do what he wants and pass-thru both shore power connections but he's going to need two Cerbo GXs since the inverters will act independently.

Is there a way to do what he wants using just one Cerbo? I maintain he can't (reliably) do this and will need two separate systems. Am I just missing something?

Thank you in advance for your thoughts.

Ed Jones asked
derrick thomas edited ·

2 Answers

Battery protect and battery temperature

I ask victron to insert the VE smart network connection in the smart battery protect.

It would be very important that the Smart battery protect can detect the battery temperature from a Battery sense or smart shunt, and disconnect the chargers if the temperature is too high. for example if a cell in the battery shorts out and is under charge.

Fra asked
Alexandra answered ·

1 Answer

MultiPlus 12/800/35 overload alert with no load connected

Hi There,

just bought a MultiPlus-II 12/800/35 for a small installation in my planned camper.

Today i wanted to test the device but MP-II shows an overload alert when cutting of AC power an switching to inverter mode.

It's just a testbuild with a LiTime 100Ah LiFePo4 battery and no other device connected.

Updated firmware to v502 and used VictronConnect via MK3-USB-Adapter to check configuration an alert messages.

AC throughput works.

Charger starts in bulk mode but with 0A and does not change to absorption or float.

Battery fully charged an voltage is at 13,55V. No powerloss between battery an MP-II connectors. Cables (25mm²) are short with a mega fuse and mainswitch to cut off battery connection.

Configured MP-II via VoctronConnect to LiFePo4 and checked voltage settings.

Missing informations?

Any hint is welcome!

geordy asked
geordy answered ·

1 Answer

waarom gaat multiplus na 10min naar float terwijl de batterijen nog maar op 82 % geladen zijn?

multiplus 24/3000/70 batterij staan na 24u gebruikt zonder stroom op 82 %. Na het inpluggen van de walstroom gaat hij naar bulk dan naar absorption en float in amper 10 min. Hij laadt dan maar 3a.

Als ik dit vaststel zet ik hem manueel uit en terug aan dan gaat hij terug naar bulk laadt hij 48 ampere zoals het hoort gedurende 2 uur en werkt hij netjes alles af in ongeveer een 4 tal uur. Tijdens het laden stop hij ook gaat naar inverter voor enkele seconden dan weer naar mains on.

Mijn vorige juist dezelfde heeft dit nooit gedaan. Wie kan me hierbij helpen?

joan1962 asked

0 Answers

Clarity required on 48V 3000 MPII operation

We recently installed a 48V 3000 MPII, Cerbo GX and Pylontech US3000C.

When running on AC with the heater on (1,000W) and basic consumers (375W), the system switches to inverter when turning on the kettle (2,400W). Today I briefly accidentally switched the heater to full power (3,000W), instead of turning it off while the kettle was on, showing almost 5,000W in VRM.

1. Is switching to inverter under these circumstances normal? 2. Will such 'peaks' damage the inverter?

ralf-ct asked
Alexandra commented ·

1 Answer

MultiPlus II SOC reading incorrect

Hi all, I have the MultiPlus 2 with 7 AKKUTECH ( batteries. The Multi is connected with VE.CAN - CAN type-b to the battery CAN port. (The batteries all all connected together via RS485 jumper cables) The Multi can see all 7 modules on the GX.

I have selected to have the SOC read from the Battery CAN.

An example of an issue i have now: If I log into the battery or just observe the battery LCD screen, it shows a SOC of 85%, but the SOC displayed on VRM is say 100%.

Sometimes its correct (shows the primary battery SOC), other times its just way off. I want to resolve this discrepancy.

How do i solve this? Other than it being annoying in VRM, im worried that the incorrect values may prematurely shut down the invertor or prematurely stop charging - leaving me with quite an inefficient system.

conradjdw asked
Alexandra answered ·

2 Answers

relais AC-OUT2 piloté par relais Cerbo

Bonsoir a tous , je vous contacte car je souhaite commander manuellement le relais AC out2 de mon MP2.

comme ca n'est pas possible directement et a distance j'aimerai passer par les relais du cerbo.

j'ai donc paramétré dans le MP2 le relais AC OUT2 asservi sur "signal d'entrée auxiliaire 1" en ON quand FERME et OFF quand OUVERT pendant 1s ou 0s .

j'ai connecté l'entrée auxiliaire1 directement au relais du cerbo, et je me sert de l’interrupteur qui est sur l'interface VRM pour l'activé manuellement.

oui mais ce ne fonctionne pas.

je ne comprend pas pourquoi.

pouvez vous m'aider ?

lex33 asked
derrick thomas answered ·

1 Answer

MPPT 100/50 Off state: #OR1: Insufficient PV power

My system was working fine until 3 days ago the solar stopped charging the 2 x Victron 150Ah Lithium Smart Battery, I have 3 x Midsummer Energy 150W Flexible Panel.

I didn't turn the system off, although in the past I have turned the battery isolator off without diabling the MPPT via the app.

Here are the readings from the app:





I believe I need to check the voltage and current at the MPPT positive screw with a multimeter, then check the cables when removed from the MPPT? But currently I am on the road and was wondering if anyone could infer anything from the above images please? TIA.

lemonjelly asked
Alexandra commented ·

1 Answer

Can „SUN INVERTER“ (12/250) provide solar power („without battery“) to „AC loads“ directly?


I have read the user manual of SUN INVERTER here:

In the user manual – I have found this paragraph:

2.2. Solar charge controller: The SUN inverter is equipped with a PWM solar regulator. Solar panels can be directly connected to the SUN inverter. Solar power will be used to charge the batteries or help to provide energy to the inverter AC load.

I would like to ask - whether I understood it "correctly"? Can the SUN INVERTER convert the solar power („DC“) from solar panels "directly" into (230V) alternating current („Without“ battery connected)? In this example - the sunlight would have to be available “intensively” (and for a longer period of time) – of course.


dd33 asked
dd33 answered ·

2 Answers

Qualibration écran tactile 7" AliExpress




J'ai acheté cet écran tactile car on m'a dit qu'il fonctionnait sans modification sur le Cerbo.

L'écran fonctionne, mais le tactile n'est pas du tout calibré.

Je ne sais pas faire et j’ai peur de faire des bêtises... Est-ce que vous pourriez m'expliquer ce qu'il faut écrire comme ligne une fois que je suis dans « root »? Ça me permettrait de comprendre.


nico-g asked
xavier188 answered ·

11 Answers

Bruit ventilateur Multiplus II

Hello les Victroniennes et les Victroniens :)

Apparemment il est normal que nos Multiplus II génèrent prés de 60db lorsque leurs ventilos se déclenchent, je trouve cela excessif mais Victron l'a voulu ainsi...

Autant dans une usine voire un container cela est jouable autant dans un espace clos non isolé phoniquement cela est TRES pénible.

De plus que les ventilateurs ne se déclenchent par avec une sonde de température mais lorsque la demande électrique dans un sens ou l'autre est importante et c'est dommage car dans un salle climatisée à 24° avec une température de 33° au sommet du Multi, les ventilos se déclenchent quand même...

Donc bouteille à la mer, une ou un d'entre vous aurait-il une idée pour diminuer drastiquement cette nuisance bien inutile sans devoir démonter le Multi, remplacer ces ventilos par des plus silencieux et ainsi perdre la garantie?

Bien à vous

Victronement vôtre :)

maa asked
dvb edited ·

14 Answers

Connect raspberry pi4 with cerbogx ( join datas vessel with energy)

Hello good day , Is it possible to connect raspberry pi 4 to cerbo gx to repeat the data that cerbogx shows me on raspberry pi4 with signalk , my idea is join my datas cerbo gx ( battery , tanks datas, etc) with my datas navigation ( wind , depth ,speed ,etc)from my vessel ? , thank you sou much

polonioli68 asked

0 Answers

VRM web page not working properly

Just recently I noticed that in order to get current "historical data" graph I have to reload the VRM page.

Graph is not updating from the moment I turned my computer on at 9AM


After reloading the VRM page at 16:30, I get it updated.


Every time I want to see the current data graph I have to reload the VRM page.

Also the left side bar is not working without reloading the page.

In order to see advanced page (or any other for that mater) I have to reload the VRM page. Without reloading nothing works.

marekp asked
Barbara (Victron Energy) commented ·

9 Answers

Cerbo GX dont show remote console button

After installing the Cerbo GX and connecting via Bluetooth i can see the device in the Victron connect App. But the last piont in the Device, which offers the possibility to open the remote console is missing. Firmware is v2.56

thebest-21 asked
nickdb commented ·

6 Answers

trying to connect a PWM pro charge controller to Venus OS

Im trying to connect a PWM pro charge controller to Venus OS, but Venus OS does not see it.
I have a RPI running Venus OS large. It happily runs an MPPT , inverter and 2x BMS.
Im now trying to connect a PWM pro charge controller which runs a second solar and 12v Pb in the same remote location. I have the victron cable RS485 to USB. but it does not show in the device list.
Using SSH to the RPI i can run
$ lsusb i can see the device as: Bus 001 Device 011: ID 04e2:1411 Exar Corp.
The Victron Manual from 2015 talks about installing the drivers using their free Windows program. My problem with this is i dont have any Windows machines only lynux/ubuntu/rpi.
All other documentation relating to the PWM pro just says that it is programmable via Venus OS with no mention of drivers or other.
I have victronconnect and VRM all setup with Venus OS Large on a Raspberry pi.

Any ideas would be gratefully received.

rickpickle asked
rickpickle edited ·

0 Answers

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