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

How to charge up to 80% max? Pylontech

Hello everyone. Finally I'm going to install the equipment for an off-grid and I have studied the values recommended from victron:

Absorption voltage 52.0 V
Float voltage 51.0 V

But I have read that it's much healthier for the battery to not charge it at 100%. Would it be better to charge it at less than those values?

What values is people using? I'm a bit worried for this because i trust in Victron but maybe it's better to tweak a bit those values to extend the life of the batteries. Thanks a lot.

tpwchr asked
Rob Duthie commented ·

1 Answer

Why does MPPT throttle to zero?

System is running ESS, Victron Multi II 5kVA and 2 x 150/35 MPPTs. The MPPTs throttle down to 5W randomly and for weeks now we have been trying to find a pattern. The only thing I am quite sure of is that it does not seem to happen when the inverter is turned off. In other words, if I allow the battery to discharge and then let the MPPTs charge but leave the inverter off, they work perfectly.

The MPPT (one or the other) will just stop producing and after typically 10 minutes will work fine again. Sometimes it takes much longer like 30 minutes.

I pride myself on being a very good trouble shooter but I must say, this is so seemingly random it is proving to be very difficult to find a pattern or nail down the cause. What I am 99% sure of is that the instruction to throttle comes from ESS and it stops happening when the Multi is turned off.

How can I get access to a Victron resource that can look behind the scenes at the messaging happening between the components to identify the cause of the throttling?

I have three large Victron systems coming up (two 90kVA and another 30kVA) and getting really concerned that we cannot get this issue resolved.

Many thanks for reading!


hannes asked
Michael Timler answered ·

9 Answers

Can someone help me troubleshoot my smartshunt?

It's wired so that the negative terminal from the battery goes straight to it, then you have the loads on the other side.

For some reason it picks up current but never shows total Ah consumed so all the stats are completely wrong.



chrism asked
seb71 commented ·

0 Answers

Simulateur de SOC raspberry

Bonjour à tous

Afin de tester le bon paramétrage d'une installation PV, j'imaginais utiliser un "simulateur de SOC" . Quelqu'un a t il déjà fait cela ? à l'aide d'un raspberry par ex ?

Merci d'avance

denis-esf asked

0 Answers

Mixing lead acid and lithium

My Lead Acid OPzS battery bank is "becoming smaller" as I continue to load the system more an more. Initially I sized the system for 20% DoD, but now in next winter I am afraid it may reach 40 to 50% or even more.

I have now the chance to get a good priced set of Winston LiFePO4 90Ah cells and I was thinking to build a smaller independent system to offload some of the work of the main system.

I allways thought it would be not advisable to put lithium in parallel with lead acid, but the more I think of it, the less crazy it seems. My LA system is 24V based, the 8 cell Winston would be 25.6V nominal. I would source a 3rd party BMS to manage the lithium. Maybe the BMS can take care of the issues - disconnect in low and high side of the daily swings.

I actually have found a product to make hybrid battery banks (BOS - LE300) so maybe this isn't so crazy after all.

To install in parallel and monitor the 2 strings I was thinking if it would be possible to use a separate BMV on each string (Lithium and OPZS). Is this possible, using 2 BMVs on same Venus device?

elimac asked
mvas commented ·

6 Answers

how too reset a smart shunt

Hi I have a 500AH Smart Shunt, all was working well until i switched from the MACbook to the iPhone app i pressed disable bluetooth thought it was the computers bluetooth turns out it was the shunts bluetooth. Now its totally disabled and i cant turn it back on. I have the PUK as its on the label i removed the shunt from power let it sit for 5 mins and put it back in still no joy. So question is how does someone turn the Bluetooth back on i dont have the cable or and other victron device.

philmeakins asked
Matthias Lange - DE commented ·

3 Answers

how to restore batt min value on app

My RV system is working fine but 5 days ago my 100/30 MPPT showed a batt min value after a reset to default, since then this value has disappeared on the app.- see upload below. Pls can anyone explain how to restore this reading. Thanks Peter

Days ago Date Yield(Wh) Consumption(Wh) Max. PV power(W) Max. PV voltage(V) Min. battery voltage(V) Max. battery voltage(V) Time in bulk(m) Time in absorption(m) Time in float(m)
0 28/02/2021 30 10 27 65.36 0 14.41 33 4 279
1 27/02/2021 60 0 90 67.89 0 14.41 1 45 491
2 26/02/2021 40 30 34 66.67 0 14.6 60 1 564
3 25/02/2021 60 40 83 65.69 0 14.27 121 2 628
4 24/02/2021 80 10 20 63.51 0 14.16 124 12 628
5 23/02/2021 50 0 60 67.24 12.94 14.33 27 1 537

aphpta asked
aphpta answered ·

1 Answer

Can I use auxiliary battery charger output (4 amp) on MultiPlus compact to charge a AGM start battery?

I have a new MultiPlus Compact inverter/charger. I see a 4 amp output for auxiliary charging. Can I use this on AGM start battery for charging.

cwvandy asked
cwvandy answered ·

2 Answers

How does Cyrix-Li-ct work?

I just replaced my original battery combiner with the Victron Cyrix-Li-ct. I tied the small read lead to both my dashboard wire (AUX START) and to AM Solar's AMS Lithium Control Module v4.2 to the ALT + and - connectors.

Can someone explain to me how this relay is supposed to work? I have 3 typical scenerios: (1) vehicle running (class A motorcoach) with no solar, (2) shore power and (3) dry camping with plenty of solar.

Is this a "one-way" solenoid? Are both lithium batteris and chassis batteries affected in the above scenerios?

I've included the data sheet from Victron for your refereance.


edgargw22 asked
jmccain52 commented ·

3 Answers

VRM monitoring shows wrong data

Hello, I am running an "island" (no grid) with a Quattro 48/5000/70-50/30, a stack of Pylontech batteries, AC coupled inverters on AC out and Colour Control GX.
I had wrong readings from start: even with no consuming element connected I get readings of "critical loads".
When solar inverters produce more power, there is more "critical load" even with totally near constant consumption.
And as a final statement, the sum of "critical loads" and "Charging" is greater than the PV Inverter production.
I assumed that was a problem of the EM24 AC sensor meassuring the PV inverter output. Recently I saw that the EM24 is not recommended anymore and finally decided to change to a ET112. Done a few days ago, problem is the same....
Current readings are 2071 W PV Inverter, 1455 W charging, 1105 W critical load. The realistic value of critical load is 400W maximum.
What is wrong here ?
Thank you

gherlt asked
gherlt answered ·

1 Answer

Grid assist application

Hello everyone.

my question is about grid parallel.

can i add to the Grid source the power of the Inverter when the load is high and prioritize the Pv power first

Can the load go over the max and be bigger then the nom power or the courant of the MultiPlus so the inverter can be underrated compared to the maximum courant required by the load

I have a 3 phases system with high load (2 pumps. AC, heat system plus the house consumption ) and i want to install 3 MP3000/48 in parallel so i use PV and when the load is high it powered from the grid.

i heard about grid assist but i have no idea how to make it run..... how to do that in practice

Thank you

redsam asked
michaelvausr answered ·

1 Answer

Modifying a wiring diagram

Hi does anybody have a wiring diagram similar to the Victron schematics thats editable i have tried some different programs but nothing looks anything near as good .



macca61 asked
michaelvausr commented ·

0 Answers

GX reading Grid wrong

OK so not sure how it calculate it but i have the following on my dash. approc 12kw generated , 6.8kw to battery and 11kw to grid which is kinda wrong.

Any ideas why / what. Looking at MQTT the levels look closer to correct, or at least add up better


David Gould asked

0 Answers

Blue Solar MPPT 75 10; new to me and causing confusion and difficulties

I hope someone can help with some difficulties and confusion I am having with my new Blue Solar! Many thanks if you can!!

Tiring of the spurious claims and poor performance of cheaper solar controllers I bought a new MPPT 75/10 about a week ago. It is required for a sailing boat I will be taking around Ireland this summer, and energy is a very important part of safe passage making.

I have looked through forums/online but cannot find information required, please can you help with some advice?

I have two batteries, (12v) to serve primarily engine and secondary VHF, navigation and domestics. The set up I have (the chinese controller removed and the Victron put in its place) is a 3 way switch on the + output from the controller : primary battery, off and secondary battery. Readouts: I have an amp metre on the output of the controller (after the 3 way switch) and a battery monitor giving voltage and amps.

Installation of the Victron: I followed the instructions in the little booklet, connecting battery first, then solar panel.

Problems: At first (few days, to see it works) I switched to secondary battery. The green soon showed it was on ‘Battery Life’ and the yellow on ‘bulk’ (terms from victron toolkit app). About 20 minutes and it showed , if I can recall, battery Life and Float (I was not sure of the meaning, the booklet is not clear and I had not yet seen the victron toolkit definitions). Next day I switched to primary and the same seemed to happen.

Problems started yesterday morning after I started the engine. Before starting the engine I turned off the controller feed to the batteries (turned 3 way switch to off) . This left the controller still connected to the PV and not connected to either battery. I ran the engine for routine engine checks for about 25 minutes and after turning off the engine I turned the 3 way switch to the secondary battery (waiting a few minutes after turning the engine off). The green soon showed it was on ‘Battery Life’ and the yellow on ‘bulk’, both blinking quite fast. From readouts it seems to have been charging and the voltage was going up. Unfortunately it kept going up and going up all day reaching 16.5 volts. It appears to me the controller no longer switches mode and, it seems is overcharging.

I waited all day for it to switch to float ( a sunny day, yesterday). I turned the switch to the primary battery and for half an hour it also did not revert to float (the primary had just had full charge from the engine.

I cannot find information on bootloader mode, I cannot find information on firmware does or if it needs updating.

darryl4 asked

0 Answers

How can I disable battery charging on a multiplus compact?

My system is on a boat with a MultiPlus Compact 12v/1600va/70a and a digital multi control panel.

I have 4x175w Victron PV panels connected to a Victron 100/50 MPPT controller.

My understanding is that both the multiplus and the mppt are both charging the battery bank simultaneously whilst connected to shore power. Can I turn off battery charging on the multiplus so that batteries are charged only using the solar power via the mppt?

I need AC shore power whilst in the marina so can’t turn the multiplus off completely.

fruityone asked
seb71 commented ·

1 Answer

Applicability of feed-in limit in a mix SMA/Victron system

I would like to confirm with you that the recently added grid feed-in limit function would be applicable to my system. I cannot test it myself as I have not purchased all the hardware.

I have 3 grid-connected SMA inverters totaling 14kW while my house installation can handle 14.5kW max (63A/230V circuit breaker). I am looking to connect MultiplusII 5kW in grid-parallel configuration with additional PV panels connected via both DC-coupling and AC-coupling (Fronius) to mainly server the critical loads.

I understand that in order to export energy from Victron to the grid in a controlable way I will need to install Energy meters on both the main line and on SMA inverters for Victron to know the current grid load and PV/SMA production.

Now, I noticed that during off-summer months my SMA inverters rarely exceed 10-12kW production. I would like to know if I can use Victron and its grid feed-in limit to set the maximum feed-in of both Victron and SMA at exactly 14kW ? (i.e. top-off SMA production with Victron power, if I understand correctly Victron cannot regulate SMA in a grid-parallel setup, correct?).

In above is correct, question #2: In reality, how strict is the realization of feed-in limit ? Is it possible that the system will exceed the 14kW limit for a brief moment and trip the main circuit breaker (14.5kW) ?


maciek-haranczyk asked
maciek-haranczyk answered ·

2 Answers

VE.Bus Specification

I've got a three-phase ESS System with 3 Multiplus-II and an Octo GX as Controller. It works for two years, sometimes I had to reset the system, but what's perfect.

Last Month there was an dramatic increase of different VE.Bus Errors.

One Multi with the Octo works well, all Three Multis on the Bus leads to VE.Bus Errors after few Minutes.

I've Oszillographed Pin 4 and 5 of the VE.Bus of each Multi without any Cables attached an found big differences.

What are the Specs of the VE.Bus. I'm working since 30 Years with transmission system and I've got a Degree in Electronics, but my Dealer want's me to send him my whole equipment.

Anyone here to interprete my measurements?




perfect Rectangles look different, but especially the Signal of the third Multi is only half of the other two above.

After switching off AC and DC I measured the resitance between Pin 4 and 3 (ground) and Oin 5 and 3.

It was always 14 to 15 kiloohms, only on the third Multi with the weak signal it was pin 4 to 3 only 76 Ohms (no kilo!)

I think it is enough to give this Multi closer observation, only attaching it to the Octo works, the Errors occure lnly with more actice Devices on the Bus...

udo229 asked
udo229 answered ·

2 Answers

How does the SmartSolar know my battery is LiFePO4?

This isn't a big deal, as my SmartSolar seems to work fine.

But out of curiosity, on "page" 11 of my SmartSolar manual it says,

(Update: I don't know why the forum won't let my links show. It's )


Reset of the charge algorithm:
The default setting for restarting the charge cycle is
Vbatt < (Vfloat – 0,4V) for lead -acid, and Vbatt < (Vfloat – 0,1V)
for LiFePO4 batteries, during 1 minute.


Okay, that's fine if one uses the default LiFePO4 setting. (Or, alternatively, Position 7 via the rotary switch with the battery type set to "Rotary.")

But I'll bet most of us have modified at least one setting in the default, which then changes the type of battery to "User Defined."

So, is my SmartSolar using 0.4V for the reset? Or 0.1V?

In this case of "User Defined," does the SmartSolar know that my batteries are still LiFePO4?

pmikep asked
kalito answered ·

3 Answers

SmartSolar Charger 150/35 - still experiencing zero output issues after firmware 1.53 and 1.54 updates


After updating the firmware on my 3 SmartSolar 150/35 devices from 1.51 I have been experiencing issues where the PV power drops close to zero. In some instances the situation rectifies itself other times I need to disable/enable via the VictronConnect app. I saw there was an issue with the 1.53 firmware and hoped the 1.54 firmware would rectify the situation but unfortunately the issue still persists. Today device 260 was off for 2 hours before I disabled/enabled it via the app.


  1. Quattro 48/8000/100-2x100 - firmware 469
  2. 4 x Pylontech US3000
  3. 3 x SmartSolar 150/35 - firmware 1.54
  4. 2 sets of 6 x JA Solar JAP72S01-330/SC
  5. 1 set of 6 x JA Solar JAM72S01-380/PR
  6. Venus GX - firmware 260



Is Victron aware that some devices still have this "drop out "issue even with the 1.54 firmware?


jkkm asked
czauto answered ·

3 Answers

how to wire two different amp Smartsolar charger controllers

how to connect mppt 100/30 and mppt 100/50, as I have 800 watts of solar going into 4 - 120 ahr lithium batteries

ronanddeb asked
macca61 answered ·

2 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

BMV712 to SmartSolar 150/35 VE Direct connection -- Is a cable more reliable than Bluetooth?

When connecting the BMV712 to the SmartSolar 150/35 can I use a VE. Direct cable between the two or do I have to use Bluetooth? And, is the cable more reliable or is the Bluetooth so rock solid that you wouldn't think about using a cable?

I'm using the BMV712 battery temperature reading to cut off charging through the SmartSolar 150/35 in the condition of batteries below 40 deg F, and I want as robust a connection as possible.

jkmann asked
seb71 answered ·

1 Answer

discharge limit battery

Hi, is there a possibility to limit the amount of discharge from the battery (e.g.40A) without limiting the inverterpower from the mppts? I want full invert power when the sun is shining and reduced when the battery provide power. My Multiplus II 48/5000/70 can draw to much power from the batteries. When I limit the Multiplus it is also limiting the inverterpower from the mppts which would not be required. Thanks

skykay asked
Alexandra commented ·

1 Answer

I need a wiring diagram simple but reliable and economical system.

I need a wiring diagram for the conversion of a van to campervan12v, with daily consumption of 1000w, which includes 2 solar panels of 115w each, a lithium battery 100Ah, connection to the alternator of the van and external connection 220v. I need a simple but reliable and economical system.

joao-lima asked
JohnC answered ·

1 Answer

MultiPlus firmware update and ship shore power supply

Getting ready to update the firmware on my Multiplus 12/3000 installed on a shore power connected sailboat. The ships computer will be performing the update, but is powered by the shore power or via the inverter. While updating the Multiplus, will my vessel loss shore power and thus power to the ship computer during the firmware update?

gscriba asked
Kevin Windrem answered ·

2 Answers

setup MPPT 150/100

hi guys ive recently purchased a smart solar MPPT VE.Can 150/100

when i first wired it up it had 110V on the array and system voltage was set for 48v the batteries were sitting at 50.5v but no current flowing even tho the bulk charge light was on

i took it back to local agent who tested it on a 24v system as they didn't have an array big enough or enough batteries to setup for 48v system

it worked perfectly

when i got it home i just changed system voltage back to 48v and there is no current flowing

so i retested it here with 110v on the PV array and system voltage at 12v and on one battery and it worked

i then retested it at 24v system voltage with 2 batteries & on same array and it worked

but doesn't work on 48V system

has any one else had this issue

running firmware V3.02

tony asked
raftoda answered ·

3 Answers

3 x SmartSolar 150/100 CAN Not Charging

Hi, we have a situation where the charge mode of the 3 x 150/100 CAN MPPT's are not outputting current/power. The MPPT's show bulk charge mode on the devices, however the VRM home page shows 'storage'. We believe this discrepancy is resulting in the MPPTs not charging the batteries.

We have rebooted, reset, unplugged all comms cables and can't get the MPPT's to start charging. All MPPT's have previously worked fine until multiplus settings were slightly adjusted (this shouldn't have anything to do with MPPT's?) and since MPPT's won't charge.

PV voltage is fine, all other connections haven't changed since it previously worked. We feel it is something to do with the comms between units or a Cerbo setting/issue? DVCC is enabled and set at 195A so this should be fine? The images below are from the same time showing different MPPT charge states (VRM/Cerbo and Device) and PV voltage.

Any thoughts much appreciated?




Sean asked
Sean edited ·

2 Answers

Lynx Distributor Terminal Sizes

I can't find any specs on the Lynx Distributor terminal size. Can anyone help?

nate-costello asked
joao-lima commented ·

1 Answer

Force Orion-TR Smart into charging mode

Hello. I just installed an Orion-Tr Smart 12/12/30 in our Winnebago Vita. So far it is working fine with engine detection mode, but I wanted to be able to force it into charging mode regardless of engine state. Our rig has a solenoid that connects the house and chassis batteries for an emergency jump start. I was hoping I could force the Orion into charge mode (removing the isolation between batteries) so I could still use that solenoid. The manual is a little confusing regarding engine detection override. So far I have tried applying 12V to the H pin and to the L pin, with the jumper between the two pins installed and without the jumper. In all cases, the Orion says "charging disabled due to voltage lockout". What am I doing wrong here?

Thanks in advance.

dpreloaded asked
dpreloaded answered ·

2 Answers