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LiFePO4 regulator settings & 3 port BMS connections???

@Justin Cook - Bay Marine Supply USA

I am still waiting for anyone to confirm I am correct on the new battery presets (which I have been told don't exist), (see pics attached).

Or am I missing something?

I also have had no reply in about 6 weeks regarding confirmation of my BMS connections being correct or otherwise, I am not comfortable proceeding with the final connection of the BMV-712 to the battery positive until I receive same.

I have marked up a picture with labels for for all cables, hopefully that makes it clearer.

I actually just followed former advice to another person put the shunt in the Blue Bat Neg cable here:

I also included a picture of the battery & BMS before any connections for clarification.

Stay safe folks.






Tex260Z asked
Tex260Z edited ·

3 Answers

BMS and HE Li-ion capacity messed up after updates

Hi recently returned to the boat which had been on shore for past 10 months (not connected to power). 2x Li-ion HE Batteries (2x200Ah) seemed okey so started updating all systems (Venus GX, multiplus, mppt, BMS400 etc).

I notice in the past week that the battery level seems to be wrong. I reset consumption stats but still at about SOC 60-65%, voltage will be <24.5v indicating it is much closer to empty.

At this 65% SOC level the multiplus also turns off by itself and no longer inverts... again suggesting SOC is wrong!

I am not getting multiple low cell voltages and have no idea how to solve this?!!

ajaunsen asked
mvader (Victron Energy) commented ·

1 Answer

VE.Bus BMS on/off switch

In VE.Bus BMS manual a "System on/off switch" is included in wiring diagrams. What is the purpose of that switch? In my understanding the BMS should always monitor the litium batteries and never be turned off. If the switch turns BMS off, it's useless. But does it turn something else on and off as the name "System switch" suggests?

Simo Hassi asked
Stefanie answered ·

1 Answer

Buck Boost low temperature charging

Hello, I am using

Victron Buck-Boost in combination with Victron LifePo4 200Ah battery and VE Mini BMS and I want to ask:

1) Does Buck-Boost cut-off charging when it detects low battery temperature from VE Mini BMS?

2) Or do I need additional Battery Protect between Buck-Boost and Battery?

I am asking, because I'll be using my vehicle frequently in sub-zero temperatures and I want to prevent battery damage that can be caused by charging in sub-zero temperatures.

Thanks for reply,


robertb asked
Southwick answered ·

2 Answers

Can I connect more than one BMS to the Venus GX?

I'm trying to connect 2 batteries from 2 different suppliers

  1. A pylontech battery with a builtin BMS that connects directly to the Venus GX
  2. An additional battery with a separate BMS that can also connect to the Venus GX

Can I connect these 2 batteries (through their individual BMSes) at the same time to the Venus GX?

How does the Venus GX manage 2 BMS inputs?

BTank asked
BTank edited ·

1 Answer

Motorhome advice? 1600-2400W 24V system, BMS, multi-MPPT for shade

My bus has a 24V alternator / starter setup. Seeking advice on a 24V leisure/office setup, as well.

I'm new to this. Does this setup make sense?

Panels: 4-6x 410W 24V / 49.5V Voc, 9.76A Imp each, used in PAIRS


  • 2s2p LiFePO4 180Ah (total 600Ah effective to 80% DoD)


  • 2s4p AGM 200Ah (total 600Ah effective to 50% DoD)


  • 3x Victron SmartSolar 100/20s (3x = top, left, right of vehicle) MPPT-synced with new 1.49 / May update(?) to adapt to partial shade
  • 1x BMV-712
  • 1x BMS-12/200? Needed if each 12V 200Ah battery already has a cheap BMS built-in
  • Something that can charge the 24V starter batteries as well? Recommend?

Nick Wiggill asked
Nick Wiggill commented ·

1 Answer

How do you control the MPPTs in a system with a VE.Bus BMS and a Venus GX device?


If I have a ve.bus BMS connected to venus, along with some MPPTs also connected to venus, does venus integrate with the BMS and shut down the MPPT chargers in the case of over voltage?


do you have to connect the MPPTs to the BMS via a " non-inverting remote ON/OFF" cable?

JasonTav asked
Jaco Reinecke answered ·

1 Answer

How to disable mppt charge with cerboGX?

Hello, there is a system of three batteries connected to lynx ion bms, two mpp 100/20 and mppt 150/35 and one quattro inverter, all of them are connected to CerboGX. There was a problem when turning off the BMS when the main contactor opened, the solar controllers continue to supply voltage to the system from which part of the circuit is energized, an error is displayed on the monitor about the loss of communication with the BMS. Is it possible to somehow solve this problem, so that charging stops when BMS is turned off, mppt controllers are connected to the cerbo cable

Anton859 asked
Daniël Boekel (Victron Energy Staff) answered ·

3 Answers

VE.Bus BMS functionality

Could somebody confirm if a BMS used in conjunction with a Smart LiFePO4 battery will shut down the output of the battery when required. The wording on the pamphlet says 'The BMS will shut down or disconnect loads in case of imminent cell under voltage' but i get the impression it will only control a separate relay (purchased separately) to disconnect the load rather than doing it in the battery itself.

chrisryan43 asked
Simo Hassi answered ·

3 Answers

Victron/Simpbms/Tesla Setup Van build


Starting a new van build and have some questions regarding battery setup.

I have 1 Tesla model s module (might upgrade to 2 in the future), I'm using Victron Buck boost dc dc 100a for alternator charging and a Mltiplus 3000w inverter.

For BMS I want to use the SIMP BMS together with a Victron gx type, this is where I have some questions and in need of some tips.

Anyone in here that uses a similar setup? Experiences?

Do you use contactors, precharge contactors as fail-safe system or Victron battery protect?

Current sensor via simp bms or victron battery monitor?

Charge enable/disable for temperatur high low, any way to trigger a heating pad?

Anyone tried simp with the cerbo gx?

A lot of questions here. Not much info on the simp bms/victron setup.

aasgardvidar asked
sacx commented ·

2 Answers

Do I need a BMS with MPPT 75/15?


I have a simple 12V solar setup: 200W panels, MPPT 75/15 and a Victron lifepo4 160Ah (manufactured in 2015).

I have set this up with a Victron minibms and connected it to the MPPT with the non inverting remote on/off cable.

But now I am wondering:

1) Do I actually need the minibms? It looks like the MPPT supports lifepo4 and will shut off the solar charging when the battery reaches max voltage.

2) If I don’t use the minibms, will my Victron lifepo4 battery cells balance automatically? The minibms connects to the two Victron battery data cable, but it’s not clear to me if the battery has internal cell balancing which works even if a BMS is not connected to these data cables.

Damien C. Tanner asked
jbakuwel answered ·

1 Answer

DVCC doesn't seems to work?

Hello again.

I'm a bit confused with DVCC function.

I've charged my batteries to 100% today, which triggered BMS to stop further charge, but Multi is not stopping, DVCC setting is enabled, BMS is sending all limits to VenusGX correctly, but it looks like Multi is just ignoring it. My DVCC settings are as below:


Battery is 100% charged, BMS set the charge current limit to 0.0A, but multi is still pushing nearly 1A into the batteries:


My system is VenuxGX (with ESS Assistant) + Multiplus II 48V/3000VA + AC coupled PV + Liion batteries with Batrium BMS (connected to VenusGX via CANBus)

I've also noticed that the same thing is happening when BMS is forcing limited charging mode (battery nearly full, CCL set to 0.5A), the Multi also is not limiting power to the set current:


Is that normal??? Am I missing something? Shouldn't Multi limit the power to the set value or I just misunderstood this function?!

Mysik asked
Daniël Boekel (Victron Energy Staff) answered ·

2 Answers

Charge limit voltage (CVL) precision

I have a question about Charge Voltage Limit (CVL) when using BMS connected via CAN bus. In my system (VenusGX and Multiplus II) I'm using BMS connected via VE.Can (Batrium BMS). I would like to set Charge Voltage Limit (CVL) to 56.75V, but it looks like precision is fix to just one decimal place, so I need to set it to 56.7V or 56.8V. Is there a way to have 2 decimal places (e.g. 56.75V). All settings in VE Configuration tool have precision to 2 decimal places, why CVL (and CCL as well) is different???

Kind Regards

Mysik asked
Daniël Boekel (Victron Energy Staff) commented ·

1 Answer

Do I need a BMS when using a single MPPT 75/15 and single Victron lifepo4


I have a simple 12V solar setup: 200W panels, MPPT 75/15 and a Victron lifepo4 160Ah (manufactured in 2015).

I have set this up with a Victron minibms and connected it to the MPPT with the non inverting remote on/off cable.

But now I am wondering:

1) Do I actually need the minibms? It looks like the MPPT supports lifepo4 and will shut off the solar charging when the battery reaches max voltage.

2) If I don’t use the minibms, will my Victron lifepo4 battery cells balance automatically? The minibms connects to the two Victron battery data cable, but it’s not clear to me if the battery has internal cell balancing which works even if a BMS is not connected to these data cables.

Damien C. Tanner asked
Damien C. Tanner commented ·

2 Answers

BMS 12/200 with multiple charge source

I am new to Lithium battery technology but am considering installing it on my sail boat. I would have three charging sources and am not sure how to connect them to the bms 12/200. Sources are alternator, shore power charger, and solar. I understand that the alternator would go to the AB connector But am not sure how I would connect the solar and shore power charger. Thanks for your help


tim22 asked

0 Answers

Multi Cell BMS from victron on raw cells


I have 4 lipo batteries in series for a 12v automotive system. Does the VE Bus BMS only monitor 1 cell? So you would need 4 VE Buses to run 4 cells? I only see them being plugged into victron specific batteries on diagrams. I have victron everything else, but it looks like I will need to get a different BMS and balancer for multi cells that have no onboard controls.

Does Victron make a 4S 100 amp BMS system for dumb batteries? Or a balancer for 4S?

Thanks for your help and time,


niftology asked
Matthias Lange answered ·

1 Answer

Active BMS, MultiPlusII, How to stop Charging...

Hy all!

I read hundreds of pages, but it seems i haven't found the right answer.

I have a 3 Phase MultiPlusII 48 3000 35 System, with AC Couppled 5kW Inverter, an DC couppled MPPT and a DIY 48 V 260 Ah Battery Bank with active BMS.


-- this picture shows the system with battery Cut Off...,

My Problem is, that the Active BMS has no interface to any System, so I used an RaspberryPi, read the "Console" and write to the Colour Control GX via Modbus some data like SOC.

I even tell the MPPT and the PV inverter to stop Charging, when the System is in Island mode (ModbusTCP).

BUT.. when the Grid is connected, I can not tell the MultiPlus to use all available Energy to feed back to grid until the BMS shuts the Relay off itself ...

I am able to stop Charging the battery, but then the Multi does not use any power from the Battery ???? and I can tell the MPPT to stop working (all done via ModbusTCP)

My question is:

Can I stop Bulk and floatcharging via ModbusTCP? or do I have to make different settings?

The System knows the SOC, and i do not need any constant current. and so on.

Important: there is an active BMS. it shuts it's relay off when 100% is reached. no overshooting, no burning energy..

What I want is, that

when charging, and the soc is > 95 % the Charging Power to the battery should be reduced to 0 when 100 % is reached.

all access Power should go back to the grid.

when there is no grid, the Chargers should reduce themselves to 0

Please give me some Info / help

Bernhard Matschinger asked
Bernhard Matschinger answered ·

3 Answers

High voltage on MPPT 75/15 battery output, when BMS closes due to temperature

Dear all,

I try to figure out, if the behaviour I see is per design or not. In my van I have installed a Victron LifePo4, a BMS12/200 and a MPPT75/15 with 2x110W solar panels. Due to the current cold weather conditions (<5°C), the battery and the BMS shutdown the battery charging.

Whenever there is sun available, the voltage on my BMS load and the MPPT battery output increase to ~17V. I assume this is due to the battery shutdown for charging. As soon, as the battery is open (>5°C), the voltage decreases to a normal level.

Is that expected? I thought the MPPT will reduce somehow the voltage when there is no charging in progress.

Why I am asking the question? If put the MPPT battery charging minus on the BMS load pin, where all my other load is also connected to. Now I have ~17V on all my devices, as long as the battery is shutdown. Is my design correct or do I need to change something?

best regards,


Fabian Pagel asked
KevP answered ·

5 Answers

multiplus with can bus battery and two signal control

Hi, I am planning to install a CAN bus BMS (EMUS G1). If the BMS has any failure it usually switches a main contactors to turn of the charger and the inverter. Is it possible to utilize the victron built in relays, which are used at two signal bms control (aux1, aux2) although it is a can bus connected battery (dvcc). Otherwise i need to install additional contactors?

2nd questions, needed if there is no way to use the built in relays in combination with the can bus control: on the multiplus manual you can read that you always have to switch of the grid before disconnecting the battery. what is if the bms does disconnect the battery with a contactor, is it bad for the multiplus (because grid is not disconnected first)? Is this problem solved by the use of a pre-charge unit?

gnagflow asked

0 Answers

BMS low voltage shutdown with Victron Smart Lithium batteries

I have 4 x 150amp Victron Smart Lithium batteries as the house bank on our sailing yacht. The batteries are connected to a BMS 12/200. I have been experiencing what I assume are low voltage shutdowns caused by the BMS. In the specs on the BMS it states this shutdown is set at approx 11V. Mine shuts down at exactly 12V. Can my BMS be programmed to a shutdown of 11V? The equipment is about 14 months old. The shutdown happens with or without the charger/inverter on.

Hope asked
Guy Stewart (Victron Community Manager) commented ·

2 Answers

When two signal bms indicates low battery, multiplus starts charging with full power from grid in ess system, instead of only switching of the inverter

I have ESS with Multiplus 2, Solaredge inverter on AC-In. I use external bms for over and undercharge protection of cells. I use two signal bms setting on aux1 and temp input. All works, the bms opens the relay because of under voltage and the inverter switches off. Perfect, but the charger switches on by full power at this cell undervoltage alarm from the bms which is not intended. I don’t want to charge from the grid. At undervoltage only the inverter should be switched of.

gnagflow asked
gnagflow commented ·

2 Answers

Ve.Bus RJ45 cabling order

Is there a proper order for cabling the following Ve.Bus devices?
(Usually with a 'bus' order doesn't matter.)

DMC GX (required for current limiter when using a Ve.Bus BMS)
Ve.Bus BMS (required for Victron SmartLithium batteries)
Ve.Bus Mains Detector (to allow for DC start when AC is present)
Inverter/charger 1 (split phase)
Inverter/charger 2 (split phase)

In a full Ve.Bus chain of devices, the Ve.Bus BMS manual suggests that there is a preferred order (page 4):


This leads me to believe that there is a required Ve.Bus order of devices which with this equipment list would be:
DMC GX -> Ve.Bus BMS -> Mains Detector -> Quattro1(leader) -> Quattro2(follower) -> CCGX

Can Victron confirm this order requirement?

I guess this leads to a bunch of other related questions such as:

Do the specific ports on the Ve.Bus BMS have to be used as labelled?
Remote to DMC GX, and Ve.Bus to the Mains Detector, before the Inverter(s)?

Is there some unspoken addressing conflict if these are wired out-of-order?
Is it that the DMC is on the same address as the CCGX, where we are hiding the DMC behind the Remote port on the Ve.Bus BMS is required?

The DMC manual seems to suggest that you can connect it directly to an inverter which indicates its a Ve.Bus Device, but the Ve.Bus instructions indicate otherwise.


Natebert asked
Natebert commented ·

1 Answer

MultiPlus 12/3000 and VE.Bus BMS/Smart Lithium jumping between bulk and absorption charging

I installed a new system, mainly consisting of a MultiPlus 12/3000/120, VE.Bus BMS and 4 Smart Lithium 12.8/100 for a total of 400Ah.
Multi firmware is 2600430. Charger set for Lithium and Lithium Assistant is set up and started.

After letting it run for 24h discharging with small loads, today I connected shore power to see how the system is performing with AC In connected.

Charger went into Bulk, charging with 50A until after some time 14.2V was reached. Then it switched into Absorption as expected. Charging amps slowly decreased, which I think is ok. But then also the voltage started to drop until about 13.84V. Charger then switched into Bulk again, charging current starts to increase until 14.2V is reached. Then the whole process starts all over again, This all happens within minutes. See images attached.

I would expect the charger to stay in Absorption for 1h as it is set for with VE.configure.
So I feel there is something not working as expected.

Any help much appreciated.


edit: additional info - the moment absorption is reached, the BMS red LED comes on, which means either high voltage disconnect or temperature. Battery voltage is around 14.2V when this happens. None of the individual cells are anywhere near 4V nor is the temperature exceptionally high.




Stefanie asked
Stefanie answered ·

2 Answers

Is DMC GX still required for systems with Ve.Bus BMS for changing input current limiter?

Is the DMC GX still required for systems with a Ve.Bus BMS for changing the input current limiter?

The CCGX manual suggests that the DMC GX is still required if you have a Ve.Bus BMS:


Are the current limit settings, which are now present in the CCGX, sufficient for for controlling input currents in systems with Ve.Bus BMS batteries without the need of a DMC GX?


Thank you,

Natebert asked

0 Answers

Err 67 - BMS Connection lost - after firmware upgrade with PylonTech batteries.

- All Firmware Updated versions indicated below:

  • Multiplus II 5kva v459
  • Smartsolar 150/60 MPPT VE.Direct v1.50
  • 3 x US3000 Pylontech Batteries
  • CCGX v2.53
  • 9 x 330w Modules

The BMS loses connection and stays in this error state. How do I solve this problem?

  • I have updated the firmware on all devices
  • I have followed the Pylontech Victron guide

The only way my system differs from the guide I am using 3 x US3000 batteries instead of 4. Could this be the root of the problem? It doesn't seem so according to the Victron guide.

Error codes:


I installed this for a client and need to do the handover soon, can this problem be solved, how do I reset the alarm? Can this all be done remotely?

I did a manual reset on site and the sytem was running without errors for about 5 days and now the problem is back.

jond asked
DayAndNight edited ·

2 Answers

Multiple battery strings with DC-DC converters and example component diagrams and converter configurations ?

Hi Forum. I'm in communication with BMS manufacturers about how best to configure 32 prismatic cells for a marine application. System voltage of 48 although the vast majority of loads are 12. Redundancy is important so we are thinking about qty. 2 16S1P strings with DC-DC converters isolating each string. Are there any examples of such Victron configurations in the wild that I can study ?

Sven Nurber asked
Daniël Boekel (Victron Energy Staff) commented ·

3 Answers

Charging a Victron Lithium Smart battery with a Blue Smart IP65 12/25 - Which BMS to use?


I bought a Victron 160ah Lithium battery and a Blue Smart IP65 12/25 and I was wondering which BMS do I need to use.

My usage is extremely simple, i will charge the battery at home with the Blue Smart charger and then put the battery in my caravan to use it in my 12V system.

I spent a lot of time reading the forum but I am still not sure and afraid to make a mistake.

- Do I really need a BMS or is this charger enough for such a simple system?

- If I need a BMS, will the miniBMS be enough or do i need other equipment to charge the battery properly and safely?

Thank you very much in advance for your answer.

Paulis asked
Paulis answered ·

5 Answers

Max charging temp for Victron Lithium battery

I have a 3600 Multi II with a VE.bus BMS and 3 Victron Lio batteries. Configured them all with the config program and let all the defaults be after I changed the battery type to Lithium. Lio Assistant is loaded. Plugged in shore power and the batteries charged happily for an hour or two and then stopped charging. The red 4 cell volt/temp LED is lit on the BMS and the batteries report charge disable in the iphone victron connect app. The cells are all under 4 volts (well under) but the temps on the batteries are 25C. Is 25C the max charge temp? If not how do I convince the BMS to charge them once they hit 25C?


svCanna asked
Johannes Boonstra (Victron Energy Staff) answered ·

2 Answers

System shutting down when batteries reach around 26 degrees..

We have a fairly new set up on our narrowboat with 2 X 150 AH Lifepo4s. Charging from engine or solar. We are using a relatively low amount of power, and the batteries have barely been below 80% charge. A couple of weeks ago we noticed the system seemed to shut down for no obvious reason. At the time we thought it coincided with new appliances being added, eg a 12v fan or using a new tool/phone charger (via the multiplies). Now it is more frequent and we think is linked to charging and battery temperature. It happens when we enable the solar to charge or when we run the engine to cruise or heat water in the calorifier. And it always happens when the batteries reach around 26 degrees or go above this. The red LED (Cell <4V or temperature) on our VE BUS BMS comes on at the same time. Whatever it is, this doesn't seem like it should be a problematic temperature, but as soon as the system shuts itself down we're then powerless to do anything; either to investigate the issue, or to use basic on board facilities.

Ceridwen asked
JasonTav answered ·

2 Answers


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