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low battery warning

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
Guy Stewart (Victron Community Manager) commented ·

1 Answer

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

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
Leslieanne answered ·

3 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@onesolar.co.za 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

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
Daniël Boekel (Victron Energy Staff) commented ·

2 Answers

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

Why Ve BUS Low battery alarm

The VE BUS is giving a low battery alarm while the battery voltage is normal in the BMS. See picture below. There was a high current draw event and after the VE BUS voltage started swinging low when the inverter mode kicks in. Any ideas how to resolve this? The system is a split phase with 2 Quattro's and BYD battery bank of 7.5 kWh.


macevedo asked
JohnC answered ·

1 Answer

Low Voltage light on for 24V/3000 Multi II; how high does the battery voltage need to be to get it to go off and turn on the inverter?

A few days ago I completed my design and build of our off-grid RV power system using the Tesla Model S battery module and a 24/3000 Multi II (along with an MPPT 100/20, BVM 712, and 2 back to back BP220's). From the start the Low Voltage LED was on. The MPPT appears to charge OK, but not much solar power available here, so I tried the generator and watched it supply 50A+ for a couple of hours, but I shut down at 25V for fear of causing damage. Then the Low Voltage LED was blinking and now it will not even charge. I tried adjusting a few of the settings, particularly the low voltage shut-down and restart, which I have set at the minimums of 18.6/19 and also tried higher voltages for the heck of it. Then I tried resetting all of the settings back to default and lost the blinking LED. But it still will not charge from the generator, though the 712 says it is taking about 2A from the solar, the present voltage is 23.17 and the low cutoff and restart are 18.6 and 21.8 (minimums) and the low voltage LED is still steady on. If I can find out what voltage I need to be at to get it to start, maybe I could add some temporary cells to get there and then switch them out?

DonB asked
Tod Kinsley commented ·

2 Answers

lev50n yuasa with ESS fronius primo 6k + quatro8k

red light low battery always on.

battery pack 13s3p of yuasa lev50n (max volt 4.1 and min volt 2,75 - 50 A)


min volt pack 2.75x13 =35,75 V

max volt pack 4.1x13=53.3 V

when not enough photovoltaic never works battery only the external grid as backup

ESS installed and all firmware ok

some help in ESS configuration

JAVI asked
Paul B answered ·

1 Answer

Low battery and shut off Multiplus 5000/48/70-100 around SoC limit in ESS

Hi All,

I've been looking around for answers but can't find the specific answer to my problem. I have the Multiplus 500/48/70-100, Blue solar 150/70 connected to 4 x 183AH 12V Deka Gel batteries. The system is setup in ESS, optimised mode with battery life and a SoC of 70%. I've also set the 'limit inverter' function to a max of 3200W in the ESS setting which should be well within the power margin of the inverter. The batteries are connected with 50mm2 cables of 1.5m.

During the day there is no problem usually, but at the end of the day (close to the SoC) limit the inverter trips when using >3500W for some reason and tells me that the battery is low. First of all the inverter should not be doing anything above 3500W and should supplement battery power with grid power above this point. Secondly, the notification of the alarm tells me that the battery power is around 45V but after the system restarts again I get a reading of 49V, also in VRM.

I am wondering what the problem is. I also have a 156A DC breaker in between the battery banks which sometimes trips, meaning the inverter does draw far above 3200W which at 48V = 67A.

Hope you guys can help me out!


rs0882 asked
dwmarine answered ·

4 Answers

Hi Hub-4 and multiplus 12/800/35-16 The hub 4 shows battery state of charge 92% and a voltage of 8.6v. alarm appears Low Battery 0.00v.

The system has been running for 2.5 years until it started alarming christmas time. There is a 4kw pv system with Solar Edge inverter.

Does anyone have any idea what the fault could be?

Gareth Thomas asked
Paul B answered ·

1 Answer

MultiPlus II 48 3000 on Float but Low Battery Flashing

My MultiPlus-II 48/3000/35-32 is connected to a parallel set of 2 x 48V banks of 4 x 12V lead-acid batteries in series.

For the first week, it was only in charger mode and for all but the first hour, the *FLOAT* LED has been on.

Today, I connected AC out and put all my network equipment on the AC out and flipped the switch from charger mode to on. Everything has powered up and is running (off the AC passthrough) and I tested the inverter and it seemed OK.

BUT, the *LOW BATTERY* LED is flashing. That is weird. Because the charger is also on and the *FLOAT* LED is on suggesting the batteries are fully charged.

Does the "DC input low pre-alarm" value need to be reduced?


This is the battery array:


This is a video of the LEDs:

Your browser does not support HTML5 video.

warwick asked
warwick commented ·

3 Answers

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