temperature Image


Multiplus temperature alarm

Multiplus 12/3000/120-16 230/240V with firmware update 2609469

Firmware Chip number 2609408.VFD

Since installing this firmware update in March 2020 whenever the Multiplus is in Absorption mode (connected to shore power) we get repeatedly temperature alarms (light flashes on the front panel and warning message is displayed on GX Color Control device).

We only get these alarms during Absorption mode, once it switches to Float mode the alarms stop regardless of the load.

These alarms are becoming more recurrent to the point where they seem to appear every 2 min.

Is it possible to roll back to the previous firmware or is there a new firmware available that solves this issue?

SV The Dream asked
Daniël Boekel (Victron Energy Staff) commented ·

2 Answers

Battery temperature monitoring and component connections


I am planning a full Victron installation on a brand new 36 feet outboard motor boat with the following components to have the highest level of service electrical autonomy when mooring:

1 MultiPlus 12/3000/120-16

1 Digital Multi Control 200/200A GX

1 Cerbo GX + GX Touch 50

1 Battery Monitor BMV-712 Black Smart

4 Batteries Lead Carbon Battery 12v/160Ah connected in parallel as one service pack

2 Solar pannels 305W-24V

2 SmartSolar MPPT 100/30

2 Cyrix 12/24V-120 Intelligent Combiner to charge engine batteries from solar during winther

As an EE engineer, I appreciate the quantity and quality of technical documentation available. Nevertheless, the "networking" and communication between components is not very clear because of the multiple networks/protocols/links (VE.Direct, VE.Can, VE.Bus, Bluetooth, etc…).

1/ I would have these components connected as described in the Cerbo GX Manual (chapter 2.1. Overview of connections).

I assume this is correct?

Or any recent changes or better way?

2/ Battery temperature monitoring remains unclear with respect to my list of components despite some information I could read on this forum. I read that enabling Cerbo STS would have the Cerbo send the measured battery temperature to the Inverter/charger system as well as all connected Solar Chargers.

I need temperature monitoring:

  • when charging with Multiplus (harbor)
  • when charging with SmartSolar with the Multiplus turned on (mooring).
  • when charging with SmartSolar with the Multiplus turned off (mooring).

Does the Multiplus temperature sensor provide temperature data to the Cerbo and to the SmartSolar even when the Multiplus is turned off?

Or do I need to add a temperature sensor to the BMV-712?

Or do I need to add a VE.Bus Smart Dongle?

3/ If I do not add the VE.Bus Smart Dongle, can I still get the system monitoring data connecting the VictronConnect iPhone app to the SmartSolar via Bluetooth?

Thanks for your help

x_charpentier asked

0 Answers

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
ChristofferBengtsson commented ·

1 Answer

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

Multiplus II temperature & performance

Hi community,

I have got 6x multiplus 2 3000. Every day when the sun is shining fully (no clouds) my multiplus start to decrease their performance when 13200w are surpassed. (thats approx 2200w per device)

The performance decreases till it reaches 12400w (approx 2066w per device)

Temperature in the room is about 23 degrees, so I don't think this is the reason.
Any other ideas?

N-DEE asked
N-DEE edited ·

2 Answers

MPPT internal temperature and throttling information

I have 4 SmartSolar 100/30's hooked individually to 4 LG Neon 360w panels and communicating with a BMV-712 with temperature sensor. MPPT manual says full rated output up to 40c. Two questions:

Is it possible to read the internal temperature of the controllers?

What does the compensation curve look like at 40c, 45c, 50c, etc? Meaning how much power is cut?

Cosmos asked
Dzl commented ·

1 Answer

Multiplus Temperature Light

This forum has been helpful so time to give back...

There is an undocumented (as far as I know!) error code involving the TEMPERATURE light on the Multiplus.

Normally, if the TEMPERATURE light is flashing, that means the internal MUTIPLUS circuitboard temperature is approaching its upper limit. This is documented in the manual. The light has an additional function that I have not seen documented anywhere.

When in CHARGE mode, if the battery temperature exceeds a preset limit (50C, I believe), the TEMPERATURE light flashes, and the charging current turns off when bulk phase completes and absorption phase of the charge cycle starts. (The part about the current shut down IS documented, but the flashing temperature light is not.)

If the TEMPERATURE light flashes while MAINS is on, and the inverter is off, try turning the MAINS power off. This shuts down the charger, and turns on the inverter. If the TEMPERATURE light immediately stops flashing, the problem is the battery temperature is too high. If the problem is truly the MULTIPLUS internal temperature, the temperature light will keep flashing.

billknny asked

0 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
daveinfl answered ·

2 Answers

How to keep Victron equipment cool in hot Aussie summers?

simple question - what can I do to bring the temp of my inverter/reg and batteries down (running easysolar 48/5000 w/ 10kw BYD lithium). Can I bring the inverter units fans on prior factory setting? other options?


camcairney asked
mdbrown answered ·

5 Answers

Lithium battery charging in Arctic expedition conditions

@Ur12VMan , @Daniël Boekel (Victron Energy Staff)

Hi 12VMan (and Victron staff please). I found your thread on Lithium battery protect settings while searching, but decided my comment should be a new question.

Thanks for your answer in that thread, mentioning that Victron lithium batteries issue a temperature alert at 5C. This gets my attention. My research to date was indicating that lithium batteries are OK for charging down to around 1C (and for discharging well below 0C, as an aside). I need to pursue this, as I'm planning to use Victron LiFePO4 batteries in Arctic conditions, in an expedition yacht that will be static for days to a week or two. Water temps will be down to around 2-3C, sometimes lower depending on icing. I'm looking into the need for heating for the battery box, which will be under the insulated floorboards and so outside of the primary heated spaces. If 5C is the real deal, I need to get serious with calculations on battery energy that might be consumed in making the batteries warm enough to be chargeable. Or other heating.

So, where is this 5C figure coming from? OK, I see +5C mentioned in the 12.8V LiFePO4 battery data sheet.

This prompts a few specific and important questions, about the Victron 12.8V 300Ah variants:

1. What is the lower internal battery temperature at which the battery signals to a connected BMS that charging is not permitted?

2. If the answer to Q1 is different than +5C, what is the consequence in terms of battery health (and charging efficiency?) of charging occurring between the two temperatures?

3. Does the answer to Q2 depend on the rate of charging?

4. If the internal battery temperature is just high enough for the battery to allow itself to be charged, and in this case at a low rate of 20A per battery (80A from a normal alternator, shared between 4 batteries), will this charging slowly warm the batteries up such that a higher rate of charging can be initiated in due course?

5. At what battery temperature (measured by a sensor on the positive terminal, or is there a way to get the internal temperature?) can high rate charging at ~150A per battery be initiated, such that no appreciable damage to battery health occurs? Would it be prudent to step the charging rate up slowly as the batteries warm up?

Clearly, it will be helpful if I rig a temperature sensor for the battery box, to guide appropriate action before each charging session.

The boat will use an Integrel On-Engine Charger (basically a big and very efficient second alternator) which can charge at up to a very high rate. Or it can be turned off so that charging is via the engine's standard alternator only. I might need to raise the battery box temperature before starting to charge each week or so. Heat from the main engine during these charging events will then help.

Thank you for your help with these questions. :-)

Valden asked
Valden commented ·

3 Answers

EasySolar 48/5000/70-100 Multiplus Overheating

Good day all,

I have an EasySolar 48/5000/70-100 with MPPT150/100 and when I load the inverter to above 2500W when on solar, I receive the following alarm and the inverter shuts down. "Multiplus 48/5000/70-100, Alarm, High Temperature". The inverter restarts but will shut down very shortly afterwards with the same error. Running at 800-1000W is no problem and when the mains AC is available, there is also no problem with the higher power draw. Everything else is working perfectly. I have tried using an external fan to improve airflow around and through the unit, but the error persists. The time taken when I increase the load, to when the inverter shuts down is between 15 and 20 minutes normally.

Any advice on what could be an issue here?


EEnergy asked
JohnC commented ·

1 Answer

Victron MPPT Temperature Limit 40c

Hi All,

I have a Victron MPPT BlueSolar 75/15 in my shed.

Once the shed gets to 40c inside (it is hot in Australia) the Victron will stop pulling power from the solar panels.

Load still works and there are no error lights etc (still shows float/bulk LEDs as normal).

Is there anyway to change this setting as is means I am unable to pull power in from the panels for a large percentage of the day.

michaeldale asked
Marco answered ·

3 Answers

Low Temperature cut -off, Venus/BMV/Smart sensor

I have a Raspberry Pi with Venus OS, connected via USB/VEDirect to one SmartSolar 100/30 a Phoenix C24/1600 Inverter.

I am considering a BlueSolar 150/35 for a 2nd array of panels.

I use the VRM with a 4G modem for remote monitoring.

I want to replace my AGM cells with LiFePo4 cells and need to monitor the temperature, so that I dont charge them below 5 degrees C.

Can I use a BMV-712 with a separate temperature sensor, connect the BMV to the Pi and share the temperature with both the Smart- and BlueSolar MPPTS?

Or must I buy a SmartSolar MPPT???

This is what is written about the BMV/Venus OS and Temperature:

  • Add shared temperature sense, and a switch (default on) for the feature. At present only a single configuration is supported: a BMV-702 or 712 with the temperature sensor accessory. When such a battery monitor is connected, and temperature sense is enabled, the Venus-device will send the battery temperature to the connected Solar Chargers and Inverter/chargers.

// Patrik

Patrik Kall asked
Patrik Kall edited ·

3 Answers

Multiplus fan turn on temp

I have searched all over trying to find out at what temperature the fan should come on while changing but have been able to find it. Recently my multiplus got up to 52deg C while charging at 50 amps without the fan coming on. At the end of the charge the inverter would not switch on and I couldn't go back to shore power as it didn't switch either. When try to switch between inverter and shore all of the lights would flash and then shut off. 30 minutes it finally came back to life. Since then I have not used the charger function in fear of a complete failure, I am in a remote bahia in Mexico so no access to a service center. Any ideas on this, is 52c without the fan acceptable? Also is there an assistant I can add that will make the fan run when ever I am charging, I would be happy to listen to the fan and know that it's cooling. Thanks

Sailor Jerry asked
Alexandra answered ·

1 Answer

Gel and AGM batteries maximum ambient temperature

What is maxium rated operating temperature for Victron AGM/GEL batteries?

Marek asked
Johannes Boonstra (Victron Energy Staff) answered ·

2 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
JasonTav edited ·

1 Answer

Battery temperature rising and falling very quickly

good day all

i have noticed several occasions where VRM reports high battery temps.


At the time, grid is normal, bus is float, battery current is very low although battery voltage and current are a bit odd.


The ambient temperature is around 20c, and connections appear to be all tight. Is this a sign of some problem?

Russ asked
Guy Stewart (Victron Community Manager) answered ·

1 Answer

Is there LiFePo4 low temperature charging protection for Orion-Tr DC-DC and MultiPlus?

I am planning to buy a 100Ah LiFePo4 battery for my RV, and manage/use it with a Multiplus 1600VA inverter/charter and Orion-Tr battery-to-battery charger.

I have read the manual for the multiplus and orion, and can see that they can limit charging when the battery gets too hot...which is nice, but I am unable to see if they can stop charging when the battery is below zero degrees. Can they? :)

BoMadsen asked
BoMadsen commented ·

4 Answers

Problem with Pheonix 12/220 after exposure to high ambient temp.

When switched on led flashes red and then extinguishes. It is located in a motor home and has possible been exposed to ambient temp in excess of 40 degrees. All connections are tight. Any insight would be appreciated.

Aidan asked
mvader (Victron Energy) answered ·

1 Answer

How to switch on a fan from a mppt or 712?

I've been reading for a while to see whether the above is possible, and if so how to accomplish it with what is already installed.

Currently I have a Smart MPPT100/30 and the BMV-712 (and a 12/30 charger, that won't talk to the other two...) installed in a case along with a set of 3 x 130Ah AGM batteries. There's a real chance the temperature may become higher than desirable so I need to be able to switch on a fan to get some air through the case.

Basically, can I switch on that small fan without adding anything more or do I need to add in something like a temp sensor to the 712 to accomplish this? I'm not looking for accurate temperature data, just turn the fan on when it's too warm and turn off when it's all cool enough without adding anything unnecessary.

I've got an idea that it might be possible, but I haven't figured out how to do it yet and hope someone out there already knows how it is done and save me some angst working it out for myself.

And if possible, can someone quickly tell me if the 'relay' on the 712 can switch something like a <1A load, or if I need to add in a proper relay. Maybe I've missed that on the read throughs of the manual...

Thanks in advance, I hope.

(And if no answers I'll find out for myself soon enough. Would very much like to get back to it with a plan rather than a hope/dream.)

Schtoo asked
Mark commented ·

2 Answers

Indoor/outdoor thermostat (air temp) for Victron Connect?

Hi! We build camper vans and would love to add a thermostat or two to display indoor and outdoor temperatures via the Victron Connect app. Does Victron or 3rd-party have a Victron Connect device for this?

robnovotny asked
Justin Cook - Bay Marine Supply USA answered ·

1 Answer

Multiplus fan isn't turning on

I have a Multiplus 2000 12V that has been working fine for a few months since I installed it, but today while charging our batteries at 70 A for a few hours it suddenly shut off. After maybe 20 seconds it turned back on. And it kept doing it. This is the first time I can recall that we have charged for an extended period from the generator. Earlier in the year solar was enough to maintain our batteries.

I checked the Venus but it showed no errors. When I checked the inverter itself, it was hot to touch, but the fan was not running. After leaving the compartment open to the outside 40 F air for a while, the inverter was only warm to touch and was working fine again.

Am I correct in assuming this was a temperature problem? If so, why did the temperature alarm never go off? Shouldn't the fan be running when the inverter is hot to the touch? Is the fan easily replaceable without pulling the inverter?

AKNate asked
AKNate commented ·

1 Answer

SmartLithium Battery Temperature Sensor - believable?


I have 2x SmartLithium 12V/150Ah batteries, as a series 24V pair, located right next to each other.

Battery A claims its temperature is 8°C, with a 2°C offset (i.e. with no offset, 6°C)

Battery B claims its temperature is 6°C , with a 1°C offset (i.e. with no offset, 5°C )

The BMV temperature sensor connected to Battery A positive terminal reads 7°C.

Dedpending on who is correct, these temperatures are close to the "do not charge" threshold of 5°C.

Which should I believe?

JasonTav asked

0 Answers

Pheonix Smart IP43 charger connection to temperature sensor?

Can the Victron Pheonix Smart IP43 charger connect to and use a battery temperature sensor?

I know there's a similar question out there but an answer has been added to that question which really isn't an answer and the question has been ignored for months.

Martin asked

0 Answers

Blue Smart IP22 update with temperature control & charging stop for LiFePo4 Batteries?


maybe someone knows about a possible Firmware-Update of the Blue Smart IP22 (12V/3 Outputs) to control the temperature and stop charging of a LiFePo4 Battery for example if the temperature is lower than 5°C. And of course a update to integrate the IP22 into the victron bluetooth network with smart battery sense sensors.

The SmartSolar MPPT for example has this options to stop the charging when the temperature is to low for a LiFePo4 battery (and i can use the SmartSolar with the smart battery sensors).

Thank you for your support.


Ropo asked
Ropo commented ·

1 Answer

Regulation of PV inverters in Off-grid systems

I am trying to set up a 1-phase off-grid system. I have:

+ 2 Quattros 15000

+ 2 Fronius Primo 8,2

+ 2 10 kWh BYD BOX Batteries (with the special VE.CAN Cable)


+ Energy Meter ET112

+ 14 kVA Genset

Don't pay attention to the oversizing of the system, it will be expanded afterwards. Right now I don't have any connected loads, just the battery and the CCGX can get energy.

I want the PV inverters to produce energy to supply the loads and to charge the batteries if there is excess of energy. If there is energy surplus, I want the PV inverters to reduce dynamically their output power (as with ESS the Zero feed-in feature).

1) Is this possible?

I have set in the Fronius the MG50 code and loaded the assistant PV support Inverter to the Quattros (VE.Bus Configure --> VE.Configure Q1 and then Q2) according to https://www.victronenergy.com/live/ac_coupling:fronius. I have more than 15.68 kWp < 15000 kVA x2 but the assistant is telling me that the size of PV should be less than the power of Quattros.

2) Should I split it (7.84 kWp and 8.2 kW to Q1 and 7.84 kWp and 8.2 kW to Q2)?

The system is not regulating and when there is about 8 kW from the PV inverters, the batteries are loading superfast and hence I get a temperature warning in the Quattro and the system stops. I have set via CCGX a current limitation of 35A but it is not respecting it.

3) How can I limit the power to the battery?

Luis asked
Luis commented ·

1 Answer

Victron SmartSolar MPPT 100/30 Controller low temperature cut-out

With regard to battery over- and under- temperature protection/cut-out (for LiFePo4 chemistry, where AIUI charging should not be performed when outside the range 0-40C): the VictronConnect - MPPT Solar Charge Controllers page notes that "In case there is no external source for battery temperature; charger uses its internal temperature for battery temperature compensation." and goes on to explain the idle requirements.

The next section notes that it will do under-temperature protection with an external sensor.

I presume from this that the SmartSolar will not consult the internal temperature sensor to consider if the temperature is too low prior to starting a charge cycle? Which is a pity as it would otherwise seem perfectly placed to do so: in cold conditions, if the device at ambient temp is below some low threshold (5C?) then just don't start charging.

BenL asked
norbert commented ·

3 Answers

temperature alarm ccgx

First time in 4 years, my system switched itself off because of a temperature alarm. Problem is, I don't know where it came from. I have a Quattro 48/8000 and a BMV-700 (no temp stuff). The batteries have a temp sensor that goes to the inverter, but not to the ccgx. Was it the inverter telling the ccgx about hot batteries?

Paul Carmichael asked
Paul Carmichael answered ·

2 Answers

Smart battery sense compatibility with BMV 712

I have installed a smart battery sense in to my system in the hopes that I would be able to read the temperature on the BMV, I am using the second input on my BMV already for start battery voltage so that option was not available.

After some research it appears the BMV does not accept the temperature from the SBS. Is it possible that this feature will be added at a later date?

I imagine it would be simple seeing as both devices support the VE network

Zakthomas asked
Mark answered ·

1 Answer

50 Posts
84 Users

Topic Experts

0 Points
0 Points