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Multiplus-II: Input current limit ignored after heat warning

Hi all. My Multiplus-II (24/3000/70-32, fw v.487) is acting strangely today. Been fine-tuning my setup since august last year and everything have been working perfectly. I am using Venus OS large with node-red to control most functions of the setup, which includes two shunts (one to measure battery current and one to measure PV current), several off-brand MPPT's, and a big battery bank of 32 x 75Ah AGM batteries.

Today i received a warning e-mail from my node-red system about a temp warning. I went to the unit and checked, it was warm, very sunny day which means several dump loads have been running very long with a total of 2 kW, not surprising that it got hot, but after removing the lower grill to ease air flow the warning went away. My idea was next to help it a bit by enabling the grid and power assist on 3.5 A to take some of the load off the inverter for a while. I have used power assist very much and it has always kept the limit, but to my surprise, even though I double checked the setting in the console, when I stopped ignoring AC in, it went up to 8 A power assisting, then switched to passthru not inverting at all, then back to power assisting 7-8 A and to passthru and flipping between the two constantly. Wut?!, I ignored AC in which had it inverting the whole load perfectly fine.

In the evening when one dump load had turned off and the load became lower (around 1500W), I tested the power assist function again. It is set at 3.5A still and it started assisting with 8A, then after a few seconds started going down and finally settled at the level I am used to seeing. Now it goes to the "right" limit straight away when stopping ignoring AC in, working as it has always been before.

Anybody have an idea what caused this? I merely want to understand it, I believe it is a good idea to install an extra fan to cope with these cloud-free sunny days, but why the power assist function would become non-functional because of a bit of extra heat is beyond me. Note that it never went into temp alarm, only temp warning...



mrhappy asked
mrhappy edited ·

0 Answers

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
matt-rsa answered ·

6 Answers

No temperature displayed in VRM Dashboard

I used to be able to see the battery temperature on the main Dashboard. I recently made a few changes to my setup and now the temperature has disappeared. The changes made were:

1) Removed BMV-702 and installed SmartShunt

2) Installed a BMS and connected to the VenusGX via CanBus

3) Updated MultiPlus firmware to latest and enabled ESS

The MultiPlus, SmartShunt, and BMS each have a sensor and are reporting temperature. I can see it in the Remote Console and on VRM if I configure an Advanced Widget, but I can't seem to make it show on the Dashboard. Appreciate any advice, thank you!



jjs029 asked
mvader (Victron Energy) answered ·

2 Answers

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
Kevin Windrem answered ·

5 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 commented ·

3 Answers

Built-in (low) temp sensor SmartSolar MPPT

Hi there, I am using a SmartSolar MPPT 75|15 and read in the specs that it has a temp sensor built-in. I tried to use it for a low temp cut-off but couldn't trigger it as an attached temp sensor is needed for this feature? (see also my video of my test https://youtu.be/S9qw9-SSplo?t=300)

Is this correct and why couldn't the built-in sensor be used for a low-temp cut-off if the temperate is already measured? Is it due to the heat that is produced by the charge controller?

thanks, Lupo

lupo asked
lupo commented ·

2 Answers


I see from the 250/100 datasheet:

Operating temperature -30 to +60 °C (full rated output up to 40 °C)

In our summer conditions, almost all MPPTs we have installed are too hot to touch.

We are collecting thermal imaging to provide examples, but in some cases, we have installed forced cooling in order to satisfy customer concerns.

We are concerned that this may result in a higher failure rate than Victron intends and we note that there is no warning between Venus OS and MPPTs about temperature. We have never observed an MPPT derating on over-temperature, which we would expect to see at temperatures over 40 degrees C per the datasheet entry above.

I'm sure places like Australia and the Southern US where Victron is also popular will also be experiencing the same sort of operating temperatures.

We have designed and are testing a robust, temperature driven forced cooling solution for our installations going forward but it comes at a cost and we need to determine whether this is actually necessary from Victron's perspective.

Any input or advice on this would be appreciated.

Warwick Bruce Chapman asked
Warwick Bruce Chapman edited ·

0 Answers

BatteryProtect 12/24V 65A stops working in -20 deg weather


We use the BatteryProtect 12/24V 65A to stop batteries from being drained too low on some farming equipment that uses solar panels to charge the systems.

We've installed about 100 of these so far and they work as expected. But on 4 separate occasions, we've seen a problem. It seems that the BatteryProtect will unexpected completely stop working (no lights or error code at all) in cooold weather (-20 deg C).

Even disconnecting it from the circuit doesn't seem to fix the issue. The only solution that has fixed it reliably for us is to literally short out the screw posts for a few seconds. This causes the startup lights to flash, and the things starts working about.

We've only witnessed this occurring in very cold weather. The datasheet says operating temperature is -40C, so I'm not sure what is going on.

Does anyone have experience like this?


clockinc asked

0 Answers

Battery temperature not reporting

I just installed my victron setup not to long ago and I noticed that I am not getting any information about the battery temp. My setup consists of a multiplus 2x120, lynx BMS/distributer, and two smart 160 batteries in parallel.

The issue I am having is I am not seeing the battery temps being reported in VRM. it was my assumption that the smart batteries would be able to report their own temp. I can see the temp in Victron connect when I connect directly to them but that info is not getting pulled in for some reason.

I have turned on MQTT and am looking at the raw outputs which also don't seem to be pulling temp from anywhere.




Is there something in the config that I need to turn on to get Lynx to pull the temp from the battery? I am concerned that from what I can tell, the system doesn't know the battery temp and if so doesn't have the proper information to change things based on battery temp

Matthew Shea asked
Stefanie commented ·

2 Answers

Replace one 500A MEGA fuse with two 250A fuses

Hi there,

I'm a little bit confused - haha :D

Preliminary information

My electronic setup basically looks like the automotive showcase from Victron with some slight differences. Key features:

  • 400Ah Victron Smart Batteries
  • 3000VA Multiplus
  • Lynx Distributor to connect the Multiplus (and 12V loads) to the batteries
  • 2x 95mm2 cables to connect the Multiplus to the Lynx Distributor
  • Copper bar to connect the main switch with the fuse

Example Use Case & Problem Description

My 3000VA Multiplus is mainly used for cooking. In the following scenario, I used a 2kW electric heater in the early morning because my heating system was not ready at this time. (Not a use case anymore, and just for a better understanding of what was going on).

As the electric heater was warming up the inside of our Sprinter van at half power (1kW) for 90mins, suddenly the Cerbo GX showed an over-temperature warning. I got up and took a look at the system. And right at the mounting point of the main system fuse (see the mark in the image below) the copper bar I used to connect the main switch with the fuse was extraordinarily hot (60°C).


I indeed did a test of the whole system months before and did know that this point was going somewhat of an issue as it will heat up first if the system is under high load. So I placed the Multiplus temperature sensor there, just in case. And, well, the alarm struck.

Thoughts & Question

Now I was thinking about how to solve this. (I also asked a friend how is an electrician, but for households and not for 12V/24V systems.)

I'm not quite sure if the problem exists because of the huge load that needs to "get through" this single fuse? Or can it be the different materials the fuse and the copper bar are made of that are causing friction and therefore this point heats up? Because all other parts of the system aren't even hot - sure - they are warm, but not hot :)

So, how about replacing the one 500A MEGA fuse with two 250A fuses to split the load like it is done with the Multiplus connection to the Lynx Distributor? I can't find any answers on this via Google or here.

So, what do you think? Any suggestions? Alternatives?

Thanks in advance

Fabian :)

P.S. Here's a picture of my setup :)


tschoeki asked
tschoeki commented ·

4 Answers

Blue Smart IP22 30a charger internal sensor overrides bmv-712a temp for low-temp cutoff

I have 2 Blue Smart IP22 30a chargers in sync with each other and a BMV-712a to receive battery temperature. My LiFePO4 batteries are heated in an external battery box. When on A/C power and the temperature drops below freezing, even though the batteries are at 50 deg. F (10 deg. C) the chargers are remaining shut down due to low temperature where the chargers are located. This appears to be a firmware bug, I cannot find any options to set temperature priority to external via v.e. smart networking or internal.

Is that a known issue? Is there a firmware fix planned for this?


jfisher asked
kevgermany answered ·

1 Answer

Discharge stops at 5 degrees not -20, help please

Hello! I have a couple of LiFePO4 batteries and a MPPT 100 | 20 charge controller. As expected charge stops when the batteries cool below 5 degrees C. However, discharge also stops at 5 degrees, not at -20 as I understand they are meant to. I can’t find anything in the forum or online about this, nor can I find any settings related to discharge. Anyone have any insight or tips to help?

flashlight asked
kevgermany commented ·

2 Answers

Multiplus II Ignores "Low Temperature Shutdown" Threshold


I am creating this post on behalf of a fellow client of ours. Our client recently bought 2 Multiplus II's and configured them into split-phase (master/slave). Both units seem to work well except the slave unit or Leg 2 (the second Multiplus II in the set up) seems to ignore the Low Temperature shutdown threshold. Our client reached out to us about the problem attaching a YouTube video describing the issue and the specific set up that we will link as well. After inspecting the video and specific Victron Configure programming settings we asked the client to send us for BOTH units, it appears that both Multiplus II's are set up with the proper and identical settings however leg 2 (or the slave unit) completely ignores the threshold. This seems like it might be a firmware like issue, but incase anyone else is dealing with this issue, we'd like to shed light on it in hopes we can either find a fix through the community, or hopefully this brings enough attention to come out with a firmware update fixing the issue.

Link to YouTube Video: https://www.youtube.com/watch?v=3PlbLLX4kPw

jpearson1223 asked
pba 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 ·

2 Answers

Sharing temperature from MultiPlus Compact via Dongle to other devices with VE.Smart Network

I had MultiPlus Compact 12/1600/50-70 with old temperature battery sensor.
If I add Dongle I would like to share temperature between other devices like:
Orion-TR Smart and Solar MPPT Smart via VE.Smart Network. Is it possible?

tomf asked
tomf commented ·

1 Answer

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