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low battery warning

Sudden low voltage disconnect LifePo4

The 100Ah Lifepo4 battery in my camper has suddenly disconnected itself due to low voltage.

The BMV 712 however still shows a SOC of nearly 100%.

(A couple of days before the BMV got an update, which “failed”. The SOC showed by the BMV after the update was 100%, while it was 97% before the “failed update”.)

I don’t understand what might be wrong. How is it possible that the BMV still indicates that the battery is (nearly) fully charged? Can it be explained by the prevailing low temperature of mines 4 degrees of the battery?

southwick asked
southwick answered ·

3 Answers

VE.Bus low battery alarm, why?

I am getting Low Battery warning at a voltage that is different than configured in the settings. The pre-alarm is set to 10.9V, the ESS assistant is configured to do a cut-off at 12V@0.005C, yet, I am getting alarms when voltage drops below 12.25V at a much higher discharge rate. The battery monitor Voltage reading = VE.Bus DC Voltage reading so it doesn't look like a cabling issue.

What am I missing?

I am using VE.Bus firmware 465.






wrietveld asked
wrietveld edited ·

3 Answers

low voltage alert

With about 30kWh OPzS batteries (24V, 1250Ah), SOC at 97%, T° minus 2°C and a multiplus 24/5000/230 feeding a fridge and a congelator (about 63 w for a short time every hour) , Not much sun these days but SOC always remain above 96%. Problem: the batteries voltage falls every now and then . Now 18.6V. so alerts and no communication for the last 6 hours.

? How can that voltage drop so low with such a small load?

? Or is my capacity much lower than what I think?

? or any other reason?

I have 320kWh bats (OpzS), Multiplus 24/5000/230, BMV712, CCGX, VRM (codes available) + 2m snow and -10°C outside.

More information as needed.

Thanks for some tips!


Lionel SEYDOUX asked
Lionel SEYDOUX answered ·

5 Answers

Error victron quattro 48/8000, low battery led.
  • Hello, let's see if anyone can help me. In the inverter the red low battery light has come on and the inverter does not work, in the color control screen the battery is at 100% and the voltage is 55.1V. The system has four 2.5KW BYD batteries and each has a voltage of 55V. In the terminals of the inverter there is also 55V. I have checked the CAN network cables from the batteries to the control color and they are correct, but from the CAN to the first battery that cable fails a PIN. I have replaced it but the inverter still does not start. Will I need to buy the MK2 interface to eliminate this fault? Any idea of the problem?
  • Thank you
  • [image]





joan asked

0 Answers

Multiplus compact displays "low battery" and won't start


I have a 200ah 12v system with a multiplus compact inverter. Recently, my inverter shut off and displays "low battery". I was changing cables (I shut everything off and disconnected the battery) and I think it might be the probable cause.

Problem: it hasn't started back up yet, despite the soc being 100% and voltage not falling below 12.9v. I've given it days and "low battery" still displays on the controller.

Main question: Can I fix the issue without having the MK3 or is this something that I need to fire it back up?

brandon asked
seb71 answered ·

3 Answers

Multiplus 2 low battery et impossible de charger


J'ai un gros soucis avec mon multiplus 2 48v, suite au confinement les batteries se sont déchargées car pas de source électrique pendant mon absence. Maintenant j'ai un message low battery fixe sur mon multiplus et impossible de les charger quand je le branche sur ma source de courant habituelle (groupe électrogène qui les chargaient très bien avant), que ça soit en on ou charge only aucune réaction alors que la source électrique fonctionne, visible dans VE config. Est ce que quelqu'un aurait une idée pour forcer la charge avec le multiplus ? Merci d'avance.

r-pedros asked
chuff answered ·

9 Answers

ESS and low battery alarms

my Multi, MPPT, BMV and 4 x victron gel battery (in series) setup is generating frequent low battery voltage alarms as it dips beneath 49V (which is reportedly around 69% SOC according to the BMV).

The alarms clear almost immediately. I read some posts that suggested ESS can trigger this frequently as battery charge dips.

Is this normal for ESS and is there a way to make the alarms less frequent?


nickdb asked
josmeijer answered ·

2 Answers

Best way to connect/configure LVD when using Smart Victron 12/375 inverter and MPPT 100/20

Off grid project. Only one starter battery. I don't want to discharge below 12.5 volts to give the battery a chance of lasing. The inverter is going to have a tiny load (<10 watts). I'm wondering what is the best way to set up a low voltage disconnect? Both the MPPT and Inverter have programable disconnect. Inverter has a remote switch, so it can be wired to the load terminals of the MPPT. Is this the best way to wire things up? I suspect that if the MPPT shuts off the remote switch, the inverter will draw less power than it might otherwise draw while in standby. Thoughts?

shedpo asked
alex-rhys-hurn answered ·

1 Answer

Lifepo4 capacity and lynx shunt calibration

Hello from sunny south florida,

I an Electrician and my company assigned me that task of building out a camper van for a client. After some research I ended up using a multiplus 12/3000 with a CCGX, the lynx shunt 1000a, a 45amp mppt solar charger with ~250w worth of solar panels on top of the van(I wanted more panels but customer wanted more storage)and 2 renogy 170Ah lifepo4 batteries in parallel, and an alternator charger. The equipment seems to be operating as it should with the exception 1 thing that just popped up last night. The load on the system is roughly 20w to power the ccgx and the cellular internet (according to my CCGX).



with the rating of the batteries at 2175w each i estimated the system should run for ~200hrs +/-with no charge, ive been monitor the vehicle through VRM and it all has checked out until yesterday..the customer has had the van parked not in use all of last week. We had good weather all week with the exception of friday when it was cloudy all day and the solar didnt produce much.

To get to the point though the batteries died after ~ only 24-32hrs of no input am i mis-calculating something here or do i need to look into the current calibration of the system?

dan3i asked
dan3i commented ·

1 Answer

Multiplus 12/3000/120 Frequent Low Battery Alarm Shutdown

When we turn on the microwave or water heater, each draws about 1200w, 2 out 3 times the Multiplus shuts down with a Low Battery Alarm. The voltage shown on the Alarm message on the Venus GX display ranges from 14.51v to 12.37v -- see photo below, there does not appear to be low voltage. The ripple gets to 1.0 -- see video below. The shutdowns seem to be getting more frequent. Most of the time the Multi does not revive itself and has to be switched off and on. Getting lots of sun (over 1000w of solar power) does not seem to make any difference. Everything is running the latest software.

1 - Multiplus 12/3000/120-50

1 - Venus GX

1 - BMV 700

7 - Trojan Trillium (lithium) 12v batteries total 770Ah

5 - Blue Solar 100/30 controllers

5 - LG Neon 350w solar panels total 1750w


ralexbell asked
ralexbell answered ·

3 Answers

New Multiplus 24/3000/70 low battery

I have a recently installed 24/3000/70

With no AC input. When turned on, the “low battery” begins blinking and nothing else. It has 25 vdc at the unit.

With AC available, when turned on, the low battery blinks initially and the goes off when the charger activated.

I have the VE laptop software available but couldn’t see any issues there.....help!

I’m currently on the hook in the San Juans.

Thx in advance!

projectboats asked
Matthias Lange - DE commented ·

2 Answers

Quatro 15KV, MPPT 250/100, CCGX Pylontech Batteries on 51% low battery alarm on Quatro

I got a low battery alarm on the CCGX V257


The quatro V433 is longer function and the state is FAULT


I tried to reset the system a few times, no luck

Batteries look okay

Please advice

sytze asked
Alexandra commented ·

0 Answers

Frequent low battery alarm when battery even full

We have Quattro 12/5000/120-2x100120V VE Bus System and four Relion 300amps batteries. All work was done by Just Catamaran. We noticed the low battery warnings on VRM site with the preset warnings. I know for sure the batteries are not low since we have been at the dock lately and plugged in. This happened before as well but here are some recent pictures. It seems that this happens when the load is high, for example, when we have AC and hot water heater. But it is usually under 3K watts. Our inverter is 5k, so I do not believe it is over our capacity. The pictures below had only AC (12BTU and we have soft starter) on since we turned off the hot water to test. We also checked all the wires per our dealer suggestion and do not see any loose wire. What could be the reason? And any suggestions on how to solve this? Any other charts should I look at to further identify issues? Will it hurt the system?



svsonder asked
svsonder commented ·

2 Answers

Intermittent VE.Bus Low Battery Warnings, but DC Volt is OK?!



I think, but I’m not sure, that the “VE.Bus System” listed above in the alerts is probably referring to a Multiplus II unit. I keep seeing intermittent warnings like this for no apparent reason. All Physical connections seem fine and actual battery voltage is nominal.


2 x Ve.Can MPPT working together in parallel

1 x Networked CCGX

1 x 712 battery monitor
1 x Latronics LS-5048 Inverter (5kVa 48V) as the primary inverter

1 x Multiplus II (to be used as a 70A battery charger)

All the Victron gear is communicating with each other perfectly.

I have shared voltage sense turned ON

The Multiplus isn’t always charging the batteries (in charger mode) when the generator automatically starts up so we have it switched to inverter/charger mode and that’s working as a charger even though it’s wasteful being left ON all day and night with no inverter loads.

Q. 1. What is this alert referring too usually?

Q.2. Does anyone know why the charger mode wouldn’t be working but the inverter/charger mode does work to charge the batteries when the generator runs? (Sometimes there are no Led lights on the Multiplus II)

Q. Are intermittent alerts like this normal?

ecoworld asked
ecoworld commented ·

1 Answer

Under voltage alarm on only Quattro not on BYD


I had multiple Undervoltage alarms/warnings on L1 Quattro in 3 phase setup out of sudden.

The LOG file shows BYD reporting normal 54.7 V voltage There was a normal load on the system and no overload recorded. The alarms were getting triggered randomly and the log shows wildly fluctuating VE bus voltage

Does the Ve bus take the voltage only from L1 Quattro?

I checked cable tightness in Quattro ( all three phases ) as well as on the LYNX busbar.

Will check later today the breakers and the individual battery module tightness. What else should I check? The system worked for the last 1 year without any major issues.

The system is ONgrid /ESS with 10 KWH BYD pro and 3 ph 5 KVA Quattro with 6 KVA Fronius and 250/70 Smartsolar

The Log is attached - Relevant entries around 10.30 AM are marked in yellow battery alarm log_log_20200620-0643_to_20200621-0643.zip

Anil Ghatikar asked
byd-service commented ·

7 Answers

Low Battery Alarm Phoenix 24/250 even battery is full


We have in use an inverter Phoenix 24/250.

We continuously get "low voltage alarm" on the App, even so our battery is full. No LED blinking or noise!!! We tried all settings, no chance. It switches off because of low voltage!!!

Thank you,

Keep Safe and Healthy in these disturbing days,

Greetings from Jubail, Saudi Arabia

thomasw asked
Alexandra answered ·

1 Answer

SIMPBMS and Tesla batteries

Hi Folks. I'm looking for some support or guidance from the brains trust. I am using 8 Tesla Model S battery Modules with a SIMPBMS in a 48V system. The SIMPBMS is connected via CANBus to an EasySolar II (Multiplus II GX effectively). I'm using an ESS Assistant and DVCC. It all works well, other than the depth of discharge. The Multiplus reports Low Battery on L1 and starts drawing from the grid once the battery voltage falls to ~40.6V, or 33% SOC (6S battery). The firmware is all current and shouldn't have the old limitations. I can't see how to draw deeper in the battery. Please note, this isn't shouldn't be inverter start/stop issue with the known limitation of inverter restart voltage as the load on the inverter is constant.


catraz asked
stxshadow edited ·

1 Answer

Phoenix inverter 48/3000 low battery alarm

Our Phoenix inverter 48/3000 is giving low battery alert even if our battery are fully charged.

We have 4 batteries 12V/90Ah gel connected in series. Last measure of the total voltage is 54,3V measured at battery input terminals of the Phoenix inverter.
I already checked the connection between batteries making sure that there are no high currents due to poor contacts between terminals and nuts are well tight. The inverter keeps clicking internally.

Moreover, if I have only the batteries connected to the inverter I have a blinking lighton low battery. Once I connect the solar strings that light disappears ( if the irradiation is low sometimes keep blinking even with panels).

What do you advise?

nicolastenico asked
nicolastenico edited ·

0 Answers

3-phase Quattro in ESS change Li-Ion Voltage to 41V for 30 seconds.

The above scenario occurs when there is a mains failure at council level. When we simulate a mains failure with the breaker, then it does not happen.


wehrner asked
Daniël Boekel (Victron Energy Staff) commented ·

2 Answers

Multiplus - Low Battery - shutdown

HI Guys,

I have a 3000/24/70 multi . Worked fine up until today when my grid failed. I have 2*240 OMNIPOWER batteries (2 months old) .

Once the batteries got down to about 24V the low battery warning came on and the Multi shutdown. The load at the time was nothing more than 500W .

Im also running ESS, so I change the played with the Dynamic cut-off and it looked like the low battery alarm went away.

Is it safe to run the Dynamic cut-off values low? eg: low as 20%?


denzel asked
JohnC answered ·

2 Answers

Multiplus II BMZ ESS Low Battery Shut down

Load shedding (South Africa) at times causes the battery SOC to drop to 10% and the system shuts down. When grid restores the system does not restart. A cold restart (power all down and restart) is then necessary to reset the system?

Any suggestions to overcome this? Maybe limit SOC not below 15%?

James Minnie asked
James Minnie commented ·

1 Answer

Smart MPPT 75/15 showing very low battery voltage and disconnects load

I have connected a 150w panel, SmartSolar MPPT 75/15 and a 120AH battery-feeding DC loads totalling to about 720WH. However, as of 3-4 days the load started to be disconnected. After viewing the trend on VictronConnect it shows 0w,21v and 0Amps for Solar, 13v and 0Amps for battery but it also shows my battery has been as low as 0.01v and high of 14.6v.

We have had cloudy weather with about 4 hours of clear skies/day. I am in East Africa so normally we have ups to 8 hours of sun on non-cloudy/rainy days. I have 2 different installations all acting up the same. Any ideas?

Thank you.




apeter asked
apeter answered ·

3 Answers

Is there any workaround to run a Victron system with dead batteries?

Hello, I think after two years batteries are gone. It was set up and configured by company for my father, but was not monitored or serviced either. After he noticed often low voltage alarm he asked me for help, as the company is not reachable anymore.

There are 10x panels (AS-6P30-260W),
BlueSolar Charger MPPT 150/70 firmware 1.46
MultiPlus 48/3000/35-50 firmware 4.30

4x 12V victron 110Ah Gel batteries (in series)

I've studied something, purchased cables updated firmware, installed venusOS on raspberry, changed to ESS (before there was some Hub system - preventing feeding to grid - no allowed in my country) but still voltage drops very quickly and almost 90% usage is from AC grid even on sunny day, though usual load is between 200-600Watts, so I suspect inverter shuts down due low voltage very often.

I've read in this forum system is not able to run without batteries (he do no want to invest in new batteries anymore) question is, is it possible to set it up that way it will use as much solar power as possible even with such "dead" batteries, if yes what is the best configuration.

Or is Multi 48/3000 capable running with smaller voltage e.g. 12V or 24 ? I could try to isolate broken battery and try to set it up with remaining good ones, or maybe use spare 12V car battery if it's necessary for system to run

babeny2001 asked
warwick commented ·

6 Answers

Low battery warning continuaslly appeare on Quattro while SOC is high?!

Using Quattro 5000 / 120 V with an updated firmware and ESS assistant for a 48V system.

We are facing the problem of while having a high AC load and there are no available solar Energy inputs so we are running purely on batteries "having ALWAYS a low battery warning LED flashing - and of course on the CCGX- even that the SOC of the battery from the BMV is higher than 90% and the voltage is ok as well"

  1. is there a way to avoid this wrong indicator on the inverter?
    • Taking into account that the ESS settings for the dynamic battery control is modified already based on our battery type and the low voltage alarm reseat value for the inverter is set to 3 V (instead of 1.2 V default).
  2. In case we have to live with this fake warning, How can we avoid getting this warning on the CCGX?

Appreciate your advice

Mohamed Mamdouh Elkadragy asked
Jaco Reinecke commented ·

12 Answers

REC-BMS for Victron / Multiplus 24/3000 / Control Load busbar


I'm pretty new to LiFeYPO4 (coming from normal batteries) and I want to build a Victron system using Winston LiFeYPO4 batteries with REC SI BMS for Victron. I intend to build a 2p8s system which is connected to the BMS.

REC BMS communicates with Victron via CAN and CCGX will be configured with DVCC to let the BMS decide the whole charging thing.

My issue is regarding the LOAD:

In all Lithium Victron diagrams (e.g. here) a Smart Battery Protect is used to switch loads on and of. SBP is controlled by VE-BUS BMS via the load disconnect signal. But with REC-BMS I have no clue to accieve this...

Is it possible to use the alarm relay of CCGX? REC BMS also has an optocoupler but the manual says this is only for charging...

My questions are:

Is it correct that in case of undervoltage the inverter of the MPII is switche off via CAN?

Has anybody an idea how to switch of all 24/12v loads in a Victron environment using REC BMS for Victron?

Any ideas appreciated.


pegi asked
nebulight commented ·

2 Answers

MultiPlus 48/3000/35-50 & Pylontech US2000. Inverter doesn't restart because of low battery...

But the batteries are charged

Configuration: Easysolar 3Kv (Multiplus 48/30000 + MPPT 150/70 + 2 Pylontech US2000plus as an offgrid system) I had it installed with BMS managed by the batteries (CAN.Bus/DVCC...)

One day I switshed the inverter off and after that I noticed that it doesn't start again Showing low battery :-0. Only if I connect the generator it comes back to live...

Just to see were I am I went back to first running setting: BMS automaticly managed by the MulitPlus ...deactivated the DVCC, CAN ect. (MPPT error #67, reseted MPPT) still no change.

In the VRM the low battery is displayed as VE.BUS error.

Any suggestion? THX

monte-chapparral asked
monte-chapparral commented ·

1 Answer

multiplus displaying low battery alarm and wont start up

multiplus 24/1600/40. would not start up, showing low battery alarm. bmv voltage was 25.33v soc 100%. 25.33v at inverta terminals. the first time it did this we waited a while then fired up. today would not fire up. i connected jenny for about 30 seconds then when turned inverta on all ok..

i have 4x s290 rolls battery's @ 24v. 230 ah fully charged 25.2v. i dont know if dc input low restart affects this but it is set to 25.4 v lowest setting?

allso the relay light is on, it has allways been on according to manuel this is an alarm pree a larm warning. but how do you know for what?

robin asked
robin commented ·

1 Answer

Multi plus 16A -Low Batt light on

Brand new Victron Multi plus Charger/Inverter 16A . When +12v cable applied "Low voltage lt " comes on and stays on irrespective of programming. Battery voltage : 12.5 v. The unit does not charge and when Inverter is selected it does not invert . Depowering and reprogramming dip switches has been tried several times . Some "clicking" can be heard in the unit when main switch is changed over- Off-Inverter- Charging .

lars-r asked
Daniël Boekel (Victron Energy Staff) answered ·

1 Answer

Phoenix 24/3000 shutdown voltage.

What is the low voltage shutdown voltage for the Phoenix 24/3000. Is it adjustable through my BMV700 battery monitor? Or through the unit itself? What are the implications of reducing the shutdown level to say 20volts on say an electric ring, a TV or a toaster?

david-morgan asked
david-morgan commented ·

2 Answers

Multiplus low battery although voltage is good


i just transplanted my Multiplus 12/3000/120-50 (xxx4) for quick and dirty testing purposes from my old rv to my new one. But the low battery led is illuminated constantly although the measured voltage on the battery connectors is like 14.xV. I know that i have to reconfigure the battery types but for quick testing it should be fine. What might be wrong? Could it be that the old system was shut down by the bms because of a low voltage alarm? If so, how can i awake the multi whithout having shore power? the mains connector ist still connected but whithout bms it makes no sense, right?

The old rev had lithium batteries with victron bms, color control gx. the multi was controlled via the remote panel and everything worked fine.

Thanks for your help!


Jan Viehweger asked
Jan Viehweger commented ·

2 Answers

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