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MultiPlus: Disable Charger based on battery temperature

I'm currently building an RV off-grid system based around a Lithium Tesla Battery and MultiPlus. In the system is also a BMV 702, BatteryProtect 220 and Color Control.

As the Lithium Battery really doesn't like to be charged below freezing temperature I'm planning to have an automated heating pad that keeps the battery warm, but I would like to have a fail safe which disables the MultiPlus Charger whenever the temperature of the Battery reaches 5°C

My current setup is to connect the BMV-702 Temperature Control Sensor to the Battery and then connected the BMV-702 Relay to the MultiPlus AUX1 which controls the Charger via the Charge Assistant. This works nicely, but I was wondering:

1. The MultiPlus already has a Temperature Sense Connector plus the Temperature Sensor shipped, when I measure the voltage of the Temperature sensor I get a reading of 2.6V at 25°C. Is there any datasheet of the Temperature Sensor that I could use to configure the MultiPlus Assistant for temperature? I would really like to not depend on the BMV for the temperature measuring and best have the MultiPlus measure the temperature directly.

2. I found the new Shared Temperature Sense feature of the Venus/ColorControl: https://www.victronenergy.com/blog/2018/10/17/venus-os-v2-20-scheduled-charging-equalize-and-more/ which mentions:

the Venus-device will send the battery temperature to the connected Solar Chargers and Inverter/chargers.

But I don't see anything in the MultiPlus Configuration Screen to do anything with that Temperature or any other way that it actually receives the temperature form the Venus/ColorControl.

Plus just two other small questions:

1. Is there any way to see the current voltage reading on the MultiPlus AUX inputs? I'm having a bit a hard time to find the correct voltages to use in the Assistant

2. When I disable the Charger in the VEConfig all together, but then enable the Charger again via the Assistant based on the AUX1. The charger is actually running! That's a bit scary ;) Also which charge settings are used? I assume just the last settings of the charger before it was disabled all together?

schnitzel asked
durval commented ·

3 Answers

Orion DC-DC overheating

My Orion Tr Smart 12/12-30 Charger runs hot, and the output current folds back considerably. Anyone else with this problem? When cold, it will output 33A. When hot, it will fold back to 26A or less. Parts of the case may exceed 134dg F, in a cool (60dg F) environment. By adding a 80CFM fan above the fins, the case temperature is lowered by 20 degrees F, and the unit will continuosly output 30A. It would appear that the heat sink is undersized. Comments?

mdbrown asked
mvader (Victron Energy) commented ·

7 Answers

Low Temperature Cutoff not working


I have a Smart Shunt with latest firmware with a ve.smart networking setup to 2 MPPT 100/50 and 4 Ip22 12/30 chargers.

Everything is using the Lifepo4 profile with a low temp cutoff of 5 degrees C

It simply doesnt work with the charging continuing at 4 degrees C

Everythings firmware is up to date and the synchronised charging works perfectly but alas not so the low temperature cut off

Any ideas as to why?

duane asked
mvader (Victron Energy) answered ·

4 Answers

Temperatursensor am Cebro GX über Modbus-TCP


in einem Schaltschrank wird eine Victron-Batterieüberwachung für die USV-Anlage verwendet. Diese soll verschiedene Daten über Modbus-TCP an die Steuerung im Schrank übergeben.

(Smart Shunt, Cebro GX, Touch GX und 4* Temperature Sensor Quattro, MultiPlus and GX Device)

Frage: Ist es möglich, die 4 Temperatureingänge vom Cebro GX über die Modbus-TCP Anbindung weiterzugeben?

In der Modbus-TCP Register List, finde ich nur die Auswertung für com.victronenergy.temperature, welche wohl nur einen Sensor liest?!

nils-g asked
netrange answered ·

1 Answer

Relation / Action to Battery temperature

Yesterday my battery temperature rose above 30°C, I got a warning, , no alarm.
But in the charge characteristics I did not notice a reaction of the Quatro.
At what temperature a reaction will be noticeable?

Thanks, Harold


harold asked
pwfarnell commented ·

4 Answers

MPPT Derating / Throttling - Can PV voltage affect heat generated?

I'm trying to solve my MPPT Derating issue, I have 2600 watts of panels connected to 2x 100|50 Blue Solar Charge Controllers. The panels are in 2 groups of 4 in series parallel pairs with a voltage of around 80 volts. My battery bank is 24 volts.

I have a fan on the charge controllers, bad news is they are stacked, so the hot air form one tries to cool the next, but they both throttle. I also have ventilation of the charging / inverter / battery bay, but it still throttles. I see they derate at 40c, so I hit that often.

I'm wondering if there is any advantage to going to all parallel on my panels? Is excess heat being generated by stepping down 80v to 24v vs 40v to 24v ?

neoneddy asked
joeoffgrid commented ·

2 Answers

Lithium batteries with no cold weather BMS

I have a Victron Energy Smart 12/12 DC-DC charger combined with a Victron Energy Smart Shunt. My batteries (4x Ampere Time 100AH LifePo4's) BMS do not have a low temp cut-off. Will I be able to add a temperature sensor with my existing equipment to prevent charging during temperatures below freezing or do I need to add a Victron 712 battery monitor with a Victron temperature sensor and set it to stop charging at 32F?

mohospinner asked
mohospinner edited ·

1 Answer

Phoenix Smart Inverter 12/2000 low temperature Alarm fault

Hello I just installed my new Phoenix Smart Inverter 12/2000 to our CamperVAN. After connecting all cables I made an update to a new firmware. Everything was sucessfull. But when I tried to start inverter I got immediately error ALARM for low temperature. (Temperature in Van is about +22c). It looks like sensor inside inverter failed or maybe it is sw bug?

thank you in advance for kind help


Viktor Šeda


viktor-seda asked
Martijn Coster (Victron Energy Staff) answered ·

1 Answer

MultiPlus-II 24/3000/70-32 temp alarm at 2300w load


I am in the process of load testing the Victron system in my camper, and I have a question regarding the inverters performance.

I ran a load test with a heater pulling 2.300w (reported by the inverter), and after about 30 minutes the inverter shut down with a high temperature alarm. The ambient temperature was around 15 degrees and the inverter is (currently) mounted free without anything enclosing it. The inverter is running the latest firmware.

What could the issue be here? I would expect the inverter to be able to pull the 2.300w load until the batteries was empty.

Yours sincerely,

Bo Madsen

bomadsen asked
solarhack answered ·

1 Answer

Cerbo GX Celsius to Fahrenheit Issues

I know that it is ridiculous that we still use Fahrenheit in the US and the rest of the world uses Celsius. That said, there seems to be at least some provision from Victron that allows this to be switched and I would like to figure out how to do it. I have switched it everywhere that I think I can but still have mixed results. The VRM (mostly) works in displaying F over C but even then, there are bugs it seems. You'll notice that my sensor "Inside Temperature" is in F so that's good:


However, if I got to the advanced tab, sometimes it's in F and sometimes it's in C. Note that the Shunt Temperature Sensor is in F but the Battery Summary is really in C and just appends the F after the Celsius value. What's even stranger, if I wait 10 or 15 minutes, the Fahrenheit value will magically appear in the Battery Summary. Go back to the Dashboard and then back to Advanced and it shows the Celsius value again and you have to wait for 10 minutes for it to change:


Finally, I can't for the life of me get the console to show it correctly ever. This is the most bothersome for sure. Since most of the time I won't have internet access, I installed the rather pricey GX Touch 50 to display what is going on at a glance. I was planning on adding sensors for my fridge and freezer after adding the Victron Energy Temperature Sensor for GX Devices for ambient inside temperature as well. However, I simply can't get Fahrenheit to display on either the remote console from VRM or the actual GX Touch 50 so I'm holding off on that for now. Intuitively, I would think that you would select the temperature sensor from the device list and change it in the setup as shown but there is no provision for that.


There is a provision in the app shown here (this is an older screen shot, I am running the v5.41 and still having the same issue):


I've searched this forum, the Facebook forum, called tech support at a US dealer and I simply can't figure out how to get F displayed on the Touch GX. Is this simply not a feature for the Touch GX? Is Fahrenheit only available in the VRM? At a minimum, I think there is a bug in the VRM as shown above with the Celsius value stamped with an F after it in the Battery Summary. I've been really satisfied with all of my Victron components otherwise. I have to imagine that there is a way to show Fahrenheit on the Touch GX though. I can't be the only person on the planet with this issue so my guess is that it's me! If anyone can provide step by step here, that would be amazing! Thank you!

silvertown asked
silvertown answered ·

3 Answers

At what battery temperature, warning and alarm?


At what temperature will a quattro or ccgx warn and alarm?

And what action will be taken?


harold asked
harold answered ·

2 Answers

Low temp cutoff for Orion Smart and Blue Smart

Hi all!

Having some confusion about the low temp cutoff for protecting my LiFePO4 batteries.

Setup of my future campervan:

200Ah LiFePO4 Leisure battery
Victron Smart MPPT solar charge controller 100/30
Victron Smart Orion DC 2 DC charger 12/12/30 (between car battery and Leisure battery)
Victron Smart Blue IP22 charger 12/30
Victron Smart Monitor BMV-712 with matching temp sensor

My battery has no internal low temp cutoff ability. So I need a workaround. I will mount the temp sensor of the Smart Monitor close to my LiFePO4 battery.

When establishing a Smart Network between the Smart MPPT and the Smart Monitor, I can set a low temp cutoff for my MPPT via the settings in the app, so it won't charge my LiFePO4 batteries when it is freezing cold.

My Questions:

1. Is it possible to add the Smart Orion charger to the smart network, and then use the same low temp cutoff to block the Smart Orion from charging my LiFePO4 leisure battery?

2. Is it possible to add the Smart Blue charger to the smart network, and then use the same low temp cutoff to block the Smart Blue from charging my LiFePO4 leisure battery?

About question 1 I found some information on this forum tread, saying you can use the alarm relay on the back of the Smart Monitor, however it does not explain how exactly to implement this. Should i buy any hardware for that?

Thanks for any help.

kadir-aras asked
kadir-aras edited ·

0 Answers

Does Superpack 100ah ModelHQ2022 stop charging if temps too cold

We have a Winnebago View 2021 with 2 Victron 100ah lithium batteries. The data sheet states that model HG2040 and later will shut off automatically if temps are too cold but I don't know if our model has this feature. SN is HQ2022B8LE1 and PN is BAT512110705. Thank you!

zobski asked

0 Answers

LiFePo4 Smart and Battery Protect on the charger side going into short circuit after restart

I had a scenario where the batteries told the ve.bus BMS "allow to charge:NO" because the battery temperature was below 5°C - well one battery was, see my unanswered question here: https://community.victronenergy.com/questions/34077/smartlithium-battery-temperature-sensor-believable.html

Since I never got an answer for this, I am using the BMS and the temperature of the battery as measured internally as the "source of all knowledge" to control the chargers, rather than the temperature reported by the BMV-712.

This in turn turned off the battery protect on the charger side (I have 1x BlueSolar 150/70 and 2x SmartSolar 150/35 there)

All good so far.

However, when the temperature increased, and the BMS changed to "allow to charge:YES" the Battery Protect (configured in Li-ion mode) eventually went to error E1 - short circuit.

When I measured the voltage on the charger side of the BP it was ~30V - battery side was ~26V.

I then disabled the chargers using Victron Connect, restarted the battery protect by removing and replacing the remote connection from the BMS, waited until the BP had configured, then restarted the chargers one by one.

The system came up.
Obviously I don’t want to have to do this every time the system shuts down due to low temperature.

Any help appreciated.

jasontav asked
howard-t commented ·

2 Answers

Winter storage batteries -40C

Hi everyone!

About to install an Easysolar II gx system in my mountain cottage in Norway (-37 C this winter). My first off grid move and the fact of there being Victron is amazing. Thx!!

To make it as clear as possible: my question is NOT about charge or discharge but solely about idle storage aka long term effects of freezing electrolytes (freeze point being -30/35 C)

Neither interested in battery heating nor LTO solutions

Most LFP manufacturers define cold storage limit as: -20C

Only Victron and Mastervolt (which both use Winston cells (LYP) spec the batteries to -45C

Failed finding any real test data except one very interesting study that shows that deep freeze ( cryogenic freezing ) got no harmful effect.

This study does not address temperature-fluctuations around freeze point, and only measures short term effects. http://wrap.warwick.ac.uk/119502/13...erflash-cryogenic-freezing-Grandjean-2019.pdf.

It does match my understanding though that the electrolytes do NOT expand when it freezes (unlike water). If so any LFP battery would actually survive sub -30C temperatures ! ?

....this is a technical fringe question and I could just go with the winston/victron/lyp solution but if someone got the science/information I would really appreciate!

the best to you all, Nilo

nilo asked
nilo commented ·

2 Answers

Please help me identify this error/ok code (split phase Multiplus 3k-120V)

Recently my BMS disabled charging due to low temperature (at approximately 2021-03-17 0710 hrs) and as a result the batteries fully discharged. When I realized this, I raised the temperature to the point at which they could charge, but the Multipluses would not charge the batteries. The VE.bus BMS was not preventing them from charging the batteries and yet the inverter-chargers showed "off" on my Cerbo GX.

I tried completely shutting everything down and disconnecting the batteries from all loads and then powering it all back up multiple times, to no effect.

What I thought might be happening is that there was some kind of internal "minimum charger restart voltage" that was not being met since the batteries were down to about 11V. So I hooked my truck up to the trailer and used the 7-pin auxiliary power circuit (which is wired to an Orion 12/12-18 charger) to charge up the batteries. Several hours later (at approximately 2021-03-18 2023 hrs), when the batteries hit about 12.9V, the Multipluses started back up and began charging the batteries. Now everything appears normal.

Can anyone explain this behavior? Specifically, why didn't my Multipluses start charging the batteries once the VE.bus BMS allowed them to as a result of the batteries exceeding their "minimum allow-to-charge temperature"?

Here is a link to the error codes (which I cannot find in any of the VE.bus or Multiplus documentation, Victron Toolkit, etc.) that the Multipluses were flashing while the problem was occurring:


Here is a link to my VRM portal:


And here are a couple of screenshots of my inverter and charger configuration. Thanks in advance for any assistance:



jersey-dirtbag asked
jersey-dirtbag edited ·

0 Answers

SmartSolar MPPT internal temperature and fan automation

Hi there guys,

I have two SmartSolar MPPT 250/85s. They get pretty hot in the day and seem like they are throttling. I would like to automate a 48V fan to cool them. I have Node-Red set up and looking through the options, there is no way to read the internal temp of the MPPT. It clearly has a sensor for throttling. Does anyone know how to access this or why it would not be made available?



mrfunnel asked
Djino answered ·

1 Answer

Quattro/Multi Temperature Derating/Overheating behaviour in AC coupled mode

Just asking for some confirmation of what I believe I am seeing here,


This data is showing the quattro temp derating in AC coupled mode correct? The stepping of the AC output frequency and corresponding PV inverter yield coincides with the temperature warnings. The co-located MPPT yield is not throttled, the batteries are at ~65% (LA) and are in absorption, however the throttling is seeing the voltage not holding.

To me the device looks like its heat saturated, The PV Inverter reductions are too symmetrical and correspond with the temp warnings to be clouds.

It would be great if there was an indication the unit was derating or a internal temp sensor to verify.


So have a little more info from the site, the fans in the unit are slowly winding up then try to go to full speed and shutoff, this happens at exactly the same time the unit derates.

This leads me to believe that the power bus that runs the fans is exceeding its current and shutting down. Maybe by a self resetting fuse?

This unit runs a small island so sending the unit away will have problems.

It is possible for victron staff to look at any more internal data via the console to possibly determine the issue?

@mvader (Victron Energy) @Guy Stewart (Victron Community Manager) @Johannes Boonstra (Victron Energy Staff)

alan asked
alan edited ·

0 Answers

Victron LiFePo4 90Ah and Low temps


I have 4 LiFePo4 90Ah batteries that are about 6 years old. They are not the smart model, but do have BTV leads to connect to a VEBus BMS.

The system will be setup in a location where on occasion the batteries could experience temperatures of 0deg C.

I will be purchasing a smartshunt in order to measure consumption/soc etc.

If I purchase the temp sensor for the smartshunt, will this cut the charging current from both multiplus and victron mppt if the temperature drops below 0deg C?

I also have a Color Control GX that will be installed with the system and connected to the smartshunt and mppt via V.E direct. The CCGX will also be connected to the multiplus via V.E Bus.


bones83 asked
Matthias Lange - DE answered ·

3 Answers

What settings for MultiPlus Compact with RELION Low Temperature Lithium batteries

Hi everyone! Thanks for looking at my question!

I have a 600Ah Battery bank (2x RB300LT batteries from Relion) The batteries are specifically designed for low temperatures with built in heating elements, controlled by the BMS.

My question:

Are there any specific inverter settings that would optimize safely charging these batteries during low temperatures? And, if so, when the temperatures warm up, would I need to modify these settings?

Ideally, I would like to be able to set a range, and not for the seasons if possible.


Equipment list:

Van conversion-
Inverter: Victron Multiplus Compact 12v/2000w/80amp

Batteries: 2x RB300LT batteries Relion

B2B: Sterling 60Amp (1260 model)

Alternators: 2x Factory Installed 230Amp alternators

millennial-mountaineer asked
millennial-mountaineer edited ·

0 Answers

Blue Smart IP67 Charger housing temperature

My Blue Smart IP67 12/25 Charger housing reaches 140 degrees F (as measured with one of those laser temp guns) when charging my 100AH LiFePO4 battery at 25A for an extended period. Pretty much too hot to touch. Ambient temp perhaps 77 degrees. Is this expected and normal? Charging has worked fine for a number of cycles, but I'm nervous about premature failure due to excessive heat.

I didn't realize that 8% inefficiency (the corollary of 92% efficient) could generate this much heat. Not being trained in this area, I don't know how to calculate expected heat generation from power conversion inefficiency.

abeness asked

0 Answers

Winterizing - BMS ON or OFF with smart lithium?

Boston area Sprinter camper van, parked outdoors all year, with pretty cold winters. In order to best protect the batteries, should I leave the BMS on to manage the battery function or should I turn all the fuses off to avoid any drainage or charging? Should the batteries be fully charged or drained? Any advice on heating pads? Thx

pascal-m asked
seb71 answered ·

1 Answer

Flashing temperature, absorption and float lights on 12/3000/120

We have bought a boat with a 3 month old 12/3000/120 Victron installed. The previous owner explained that we should run our engine to charge our batteries using two pieces of electronics - a Dometic travelpower kit and the Victron.

We turn on the engine, power up the Dometic and the Victron then goes through its bulk, absorption, float process. We keep an eye on the Dometic and when the screen shows we have reach 0.1W (from a start point of 1.7W usually) and the Victron is at least in absorption, we switch it all off and the batteries are fully charged. Since we had the batteries cleaned up, we haven't hit float regardless of how long we run the process for (beforehand it was going into float far too quickly but not holding a charge).

In the past week, when we go through the process, with the engine on, the Dometic doing its thing and the Victron on, the temperature light has begun to flash on the Victron. We thought this was due to the cupboard confining the Victron so have put a fan on it to keep the space cool but this only delays the temperature light flashing. The past two days, not only has the temperature light flashed but the absorption and float lights have flashed simultaneously. When this has happened, the Dometic display shows we are down to 0.1W so it looks like the batteries are close to being fully charged (even though it's much less time taken than previously - maybe after only half an hour).

This began when a Betamarine engineer told my partner that the optimum revs to charge the batteries was 1200 which was higher than we had been running the engine at before (about 900 revs). We wondered if the temperature light flashing was connected to the higher revs so have pulled the engine revs back again but the temperature light is still flashing. The only other difference is that my partner topped up the water levels of the batteries a few days ago - and the temperature light wasn't flashing before he did that.

Anyone have any idea why these lights have started flashing?

ducksinarow asked
JohnC answered ·

1 Answer

Temperature sensor install

I am installing a Victron BMW 712 in my RV
I have 2 x litium batteries in parallel.

I will want to install the temperature sensor for the BMW712.

To wich battery do I mount the temp sensor to, or can I install 1 temp sensor for each battery?

esbenboell asked
wkirby answered ·

1 Answer

How can I view Victron lithium battery temp on VRM

hello guys,

I am now facing the problem of charging the LITHIUM batteries below 5 celsius on one of our rural sites, so my question is that:

how can we view the battery cell temperature online using the VRM or any other method? so not to be forced to go to the site and check it locally using the VICTRONCONNECT app

eyub asked
klim8skeptic commented ·

2 Answers

BMV Temp Coefficient and MPPT Temp Compensation

Does the BMV-7xx's "Temperature Coefficient" setting just improve SOC readings, or in a networked configuration does it also have some influence on a Solar MPPT and it's "Temperature Compensation" setting?

For Lithium batteries, the recommendation seems to be BMV Temperature Coefficient = 0.9% cap/F and MPPT Temperature Compensation = Disabled. I was just wanting to make sure a BMV Coefficient setting will not override a MPPT Compensation setting.



siletzspey asked
Stefanie answered ·

1 Answer

Phoenix Smart Charger does not restart after low temperature shutdown

My PSC IP43 charger is setup to stop charging the LiFePO4 battery when temperature drops below 5°C. It uses data from BMV712 via smart network to get battery temp.

The charger did shut down at 4°C as expected. But it does not restart even after heating the battery compartment up to 8°C.

Is this a bug in the charger firmware or did I miss something?


rheinskipper asked
wkirby answered ·

1 Answer

Incorrect battery temperature displayed on VRM


Pylontech batteries sitting at 15c degrees on ccgx,however the VRM is indicating -273 c degrees!


Mark asked
Mark commented ·

1 Answer

VRM+BMV712 - No Batt Temp

I have recently hooked up my BMV712/MPPT Solar to VRM portal via VenusOS - its really great and loving it so far.

I have battery temp being fed into the network by Smart Battery temp sensors. And this works as I can see Batt Temp on the solar? (or was it the BMV?)

Anyway - I was wondering if I am doing something wrong as despite the battery temp being on the network, it is not passed through to VRM.



bigal asked
mtnbrit answered ·

2 Answers

Temperature difference Smart Shunt versus engine bay

The service batteries are located in the engine compartment. However, the temperature (read on the Cerbo Touch pad and from the Smart Shunt) is consistently about five degrees Celsius lower than other temperature meters. Can I compensate for this? Thanks in advance.

yep asked
seb71 commented ·

2 Answers

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