SOC Image


New Batteries: Low voltage despite low usage


I just installed 2 new Duracell AGMs (100ah) in my camper. I reset the history on my BMV700. Watched a few hours of TV last night, ran the water pump a few times. Wake up in the morning to my batteries at 12.24V.

BMV shows SOC at 94% and only used 19AH. Why is my voltage so low? Did I get bad batteries?

LeaveNoTrace asked
Alexandra commented ·

0 Answers

BMV-712 not synchronizing with solar lithium setup

Hope this community can help. My BMV 712 detects a full charge but does not sync. I have 200ah of Renogy lithium batteries charging with a MPPT 100/20 on 300 watts of solar. The BMV-712 smart with temp sensor is connected to the MPPT with a VE network. I've configured my settings based on the recommendations from Victron for lithium and the SOC will jump to 100% but it does not register a sync. Its been a week with these settings, full charge every day but no sync, worried that its not a true SOC measurement. MPPT and BMV settings are listed below and in screenshots attached.


absorption - 13.9

float - 13.5

absorption time - 2min (fixed)

tail current - 3 amp


charged voltage - 13.6 (.3 under the absorption as recommended)

tail current - 4%

charged detection time - 3m

Peukert exponent - 1.05

efficiency factor - 99%

Thanks all!




ExpressLife asked
pstover commented ·

7 Answers

BMV 712 SoC draining too fast

Hi everyone,

I've read through a bunch of SoC issues by numerous people and have not seen the answer to my problem. I will try to be thorough and include my design and diagnostics I've done already.

- I have a 105AH x 4 lithium battery bank in a 12v parallel configuration totaling 420AH

- I'm using a Victron 12/3000/120 Hybrid Inverter

- I have a BMV712 with all things on the load side of the shunt(bus bar off the load side) and a single connection to the battery negative from the battery side. I have the B1 wire connection to the battery positive. I have triple verified everything is wired on the correct side

- Loads are reading properly depending on what I turn on.

This is where it gets strange. I have a 420AH bank. If I put a 100A load on the system, it will say I have only 40 minutes left and drain to 0 in such time. I should be getting around 4 hours based on the load. I did a 200A test yesterday and drained my battery bank to -381 consumed AH. However, my SoC went to 0 after only -71 Ah.

Ultimately, my BMV is reading loads in real time correctly and total consumed correctly, but the SoC is way off. It's like it doesn't understand I put 420Ah in the battery capacity setting. I put a picture of my current battery settings. I have tried synchronizing SOC to 100% multiple times at full battery charge and continues to think I have a small battery bank it seems.

Screenshot of BMV settings below. My absorb and float settings on the inverter/charger are 13.9.

thanks for any help,


DkYork asked
windsunh2o answered ·

2 Answers

SOC going to 100% immediately

Hi i have a recent install 4 x 200 a/h lithiums, 2 solar banks x 2 controllers the battery SOC gradually creeps down overnight as i would expect but in the morning as soon as the PV are lit up by the sun the SOC goes straight from say 89% to 100%, obviously this not correct , any ideas please

Macca61 asked
Jaco Reinecke answered ·

1 Answer

VE Config 3 shows 100% SOC whilst BMV 702 shows 27% SOC

I have sailing yacht with a house battery bank of 4 x 150AH Smart Lithium providing 600 ah at 12V, 2 x Multiplus 12/3000/120 Inverter Changers running together, 12/200 BMS, a 10KVA generator (220V) and a BMV 702. All equipment is Victron, installed by a Victron rep in Malta about 14 months ago.

We have just completed a 200nm transit between islands in the Caribbean and the batteries where charged via the drive engine alternator running whilst motor sailing for about around 20 hours. After this the batteries had a voltage of about 13.4V and all the cells were the reading the same. After about 40 hours at anchor we used about 460AH and the BMV 702 shows a voltage of 12.9V, SOC 27%. The VE Config shows 100% SOC and the 16 cells are reading 3.22- 3.23V. The AH consumed and therefore the SOC of 27% seems about right for 40 hours with a draw of 10-12 amps.

My concept for changing to Lithium batteries and adding a second Multi was we would be able get more AH out of the bank - This has been accomplished. Secondly I wanted to be able charge the batteries more quickly than the original AGMs.

Now the VE Config Bus Monitor shows the battery SOC as 100%. The charging output from the Multis after about 3 minutes of starting and on ABS mode is only about 70 amps on the Bus Monitor and about 58 amps the BMV 702 (net charge). This seems very low for this SOC compared to previous charging activity over the last 14 months. I would expect 120 -140 amps+ (gross). Previously the SOC shown on the VE Config would agree with the BMV 702. How do I get the VE Config to show the real SOC? I have tried the usual Microsoft solution - turn all power off on board for 10 minutes then restarted, then turned on the charger via the DMC but the VE Config is still showing SOC as 100%. I used VE Config to reset the Multis to the factory settings and then reloaded the original settings and this made very little difference. I reloaded the latest settings (before reset) but again no real change. I spent most of yesterday reading through the posts in the Forum regarding SOC problems and charging problems but nothing helped. Also went through the manuals for the various equipment and checked the settings on the Multi against these and no joy there either. I am unsure if the erroneous SOC of 100% on the VE Config is having anything to do with the low recharging amps?

What does the group suggest as my next step.

Hope asked
Hope commented ·

1 Answer

Multiplus 24v 3000va dc input restart value

I have a multiplus 24v 3000va

It runs off of 4 x 210ah deep cycle AGM

When we are on sites we run the unit on mains power and leave our air conditioner running.

Last week someone tripped over the cable whilst we were out, losing mains power and so when we got home the batteries were completely flat.

Now the multiplus has an inbuilt function to prevent this occurring.

I have the cable and the VE configure 3 software.

I go to the inverter tab and the ‘Dc Input low shut down’ is set to the default value which is 18.60v. (Completely flat battery)

I want to change to 23.80v which should be between 35-40% of my battery capacity because going below 50% damages them and reduces life.

So I change the value to 23.80v. (35-40%)

Now there is also a value ‘dc input low restart’

This means if the inverter shuts off because the batteries drop below 18.6v, the inverter won’t work until they have been charged up again to this value.

The problem is the minimum possible value is 25.80. (Higher than a full 24v battery bank!)

When a 24v battery bank is full (100%) it should read 25.46 so the only way to reset the inverter is to have it plugged into mains charging.

Now this is a great idea in theory, it forces me to charge my batteries up completely if they become exhausted below my desired cutoff value of 23.80v.

The problem is, the low light switch is activated just by switching off the inverter. When you turn it back on, the low battery light becomes activated and the only way to restart the inverter is to plug into mains even though my battery bank is 100% charged. (Reading 24.56v)

Obviously not ideal on a Motorhome which is often 200km from the nearest PowerPoint.

Why can I not set this value below 25.80? I would like the inverter to begin to function again when the batteries are maybe 80% (25v).

Thanks in advance,


Th3p4rk2 asked
Daniël Boekel (Victron Energy Staff) commented ·

6 Answers

Not reaching SOC limit

My system uses the ESS assistant and would normally discharge to the "minimum" or "active" SOC limit. Currently, this is at 30% for both. However, in the last month or so, the system is only reaching 38%, even if I switch off-grid. It seems to be switching at the sustain voltage (50v). The battery seems to be healthy and it's BMS is not giving any error. Also, the battery is charged to 100% every day. I even kept the batteries charged for 3 days but when trying it this morning it switches again at 38%.

Is this a setting issue (which has not been changed) or a battery issue? Or should I be checking something else?

AdrianC asked
AdrianC commented ·

1 Answer

Battery voltage graph and SOC% on vrm

I have been trying to get both battery voltage AND SOC% to display on the VRM dashboard without success. If I select Enable SOC in the inverter programming, I get SOC displaying both on the ccgx and the portal dashboard, if I unselect it, I get a graph line showing battery voltage instead. Can I have both? Inverter is a 15kW Quattro. Tia!

PaddyGlenny asked
Alexandra answered ·

1 Answer

MPPT isn't learning SoC from BMV-712 over VE.Smart network?

I have a SmartSolar MPPT 7515 talking to a BMV-712 over Bluetooth. In the VictronConnect app, the MPPT says this:

VE.Smart networking

This product is configured for
VE.Smart networking and is
receiving the following data from
the network.

Battery voltage
Battery temperature

Why not SoC, too? I'd like to control the load output based on SoC rather than plain voltage.

They're also both VE.Direct connected to a CCGX, which is getting SoC from the BMV, but apparently not feeding it to the MPPT either.

It occurs to me that I could use the relay on the BMV to drive a load switch, which would accomplish the same thing. But it'd be nice, consider this a feature request, if the MPPT could do it too. (And as others have pointed out, this would allow the MPPT to measure consumption.)

nbezanson asked
Alan Alan answered ·

4 Answers

SOC and NMEA2000

I am using an Cerbo GX 2,4V and have an REC BMS connected to the BMS-CAN port and then i have connected an VE-CAN to NMEA2000 cable to the VE-CAN port.

All data from the REC BMS is displayed correctly in the Cerbo, inkluding the SOC.

And Volt, Ampere, Temp is also transmitted correctly in the NMEA2000 network, but the SOC remains 0%. How to make it send SOC correctly? (26% in this case).



Offpist asked
Offpist answered ·

5 Answers

Feature request: Dynamic Grid-Setpoint in ESS, based on top SOC.

Currently the Grid-Setpoint in ESS is a static number (in watts) that controls how much system power is allowed from grid, with the remaining load being served by incoming solar and/or battery capacity, down to a tolerable SOC. While that works great in the assumption of keeping batteries @100%, every day, it’s not so good for long-term health and maintenance of lithium batteries, in a (stable) grid-tied system.

I would like to suggest an upper limit to the SOC (other than default 100%), at which point the ESS would dynamically shift the load more/less (by changing Grid Setpoint) to charge the batteries when they’re below the high mark, and otherwise running the load off of solar or battery capacity, down to the existing minimum SOC (as normal)... or similar type of functionality.

Currently, I’m constantly changing the Grid Setpoint down, to serve the system loads from the incoming solar preferentially, as much as possible. Then resetting it up again at night, to keep the batteries above a reasonable SOC. While workable, it is way more manual than it needs to be.
I believe adding a simple top SOC to the algorithm that controls when to shift to using solar would greatly simplify and automate this process.

Geomz asked

0 Answers

SOC jumps or stuck


In few last weeks, there jumps up some problems in two of our installation.


1) 2phase - 2x Multi II 5000VA 48V, 9,6 kWh Lead-Carbon battery, 4,92 kWp, Smart Solar MPPT 150/85, Venus Gx

2) 3phase - 3x Multi II 3000AV 48V, 17,2 kWh Lead-Carbon battery, 7,2 kWp, Smart Solar MPPT 150/100, Venus Gx

these are not only installation with these batteries and we have no other problems, so I am certain, that the batteries parameters are set well.

there are 2 problems:

1) there are high jumps in SOC

2) once per 2-3 weeks the SOC stucks at some point and ESS stuck in float and system needs to be restarted to correct the SOC.

With our clients I have found out, that there is some weird behaviour, when the water pump or water level sensor (1) client doesn’t have water level sensor so it looks like, there is problem in water pump (230 V) which causing energy to returning to the system (it runs with the grid disconnecte). At the other client (2) I didn’t found problem in Water pump, but it looks like, the energy returns is caused by Water Level sensor.

Excuse my English please, I am better in reading then writing.

Thank You!

Stanislav Vávra asked
Stanislav Vávra commented ·

0 Answers

Why SmartSolar MPPT continuing to charge beyond 'Charged Voltage'?

Hi, We recently got a SmartSolarMPPT 85/150 and a BMV-712 in our motorhome. We have 5 x 160w panels on our roof, and run 4 AGM batteries in a 12v system with a total of 440AH.

I have noticed that sometimes the SmartSolar continues to be putting in power to the batteries even after they have exceeded the 'charged voltage'. Why is this? The setting for 'charged voltage' in the BMV-712 is set at 13.4 (per LifeLine AGM manual). The settings in the SmartSolar MPPT are custom set to Absorption 14.4v, Float 13.4, Equalization 15.5v. I have the SmartSolar and BMV linked via Bluetooth.

I'm attaching screenshots from the App on a day when it was really sunny and the battery voltage was up to 14.17/14.19v. Do I have a setting wrong? Thanks so much!





kshilanski asked
kshilanski commented ·

1 Answer

VRM: More battery info (Cycle Count, avg. SoC)

Is there a chance the VRM could compute and show the "effective cycle count" of a battery in a shown timeframe - and/or total? Seeing this raw SoC is nice and informative, but in order to estimate % Lifetime left, there are some crucial infos missing.


A moving average SoC for the past 30/90/... days would also be helpful.

So showing something like:
300 Full Cycles eff.
85% SoC avg

would be helpful to observe aging of batteries at the monitored site.

PetaJoule asked
Guy Stewart (Victron Community Manager) answered ·

1 Answer

BMV SMART-712 'Charged Voltage' & other settings for BYD B-PLUS 51.2V setup?

Hi from Christmas Island, with a couple of 100% off-grid, solar setups, each using a bank of 4 BYD B-PLUS 2.5. 2.56kWh, 51.2V, LFP Battery Units. I've installed a BMV SMART-712 shunt to hopefully give more accurate SOC, but am unsure on exact charge values I should dial in, really struggling to find answers online, and all businesses I've reached out to haven't really been able to give me any info. My system uses a Victron MultiPlus 48/3000 35-50 and a BlueSolar Charger MPPT 150/70.

Main question is - What should 'Charged voltage' be? I have it set to 56.8V (it was on 55.2V for ages which seems low and may explain why my batteries never seemed have much capacity). Some battery spec sheets (and written on battery itself) say "Working voltage: 44.8V-57.6V" but other spec sheets for the same battery say "Operating Voltage Range: 43.2~56.4V". If it's too low I worry i'm not getting full capacity from my battery (critical in my case), and if too high I worry I'll fry it somehow.

I'm more confident about the other settings, but would love some reassurance:

Discharge floor: 90% (I assume that's correct way around, not 10%)

Tail current: 4%

Charged detection time: 3m

Peukert exponent: 1.05

Charge efficiency factor: 98%? (I see mentions of only 'round trip efficiency 95-96%' on the battery specs though? Sounds low?)

Current threshold: 0.05A

Time-to-go averaging period: 3m

Thanks very much, I'd really appreciate some advice.


Swell Lodge asked
Swell Lodge commented ·

2 Answers

SOC - VE BUS Multi 5000/24 and CCGX is not working synchrome at the beginning

I have a question about synchronization of the SOC:

I have recently an new CCGX and connected to the Multiplus with VE bus cable. Also a BlueSolar 150/85 is connected with CANbus cable to the CCGX.

The SOC goes every day a little bit up when the sun shines. After one week the SOC is now till 35%. While the the battery (1000Ah) is in state of absortion or flowting. Is this correct or is there a possibility to synchronize this directly?

Pretender asked
Pretender commented ·

1 Answer

SOC skips forward to 100% charged at beginning of aborption and 'erases' amps consumed

My system is BMV 712 & Mppt 100/50 with 400 watts solar and 470 watts lead acid Crown battery bank for an RV. The BMV712 was installed about a month ago.

The RV is parked not in use, so has an hourly draw on the battery bank of .8Ah(refer,sleep mode dvd, etc). For sake of example I have been leaving LED lights on to actually consume some battery bank

Typically in the morning there is a HISTORY 20amp Last discharge & Consumed Ah of 20Ah and bulk mode begins. Initial SOC is about 97% which is about correct. The bulk process continues with best constant charge and the Consumed Ah start to tick off 19,18, 17 until Absorption voltage is reached. At this point no matter how many Consumed Ah there are(8 today), the SOC reaches 100% and HISTORY shows Last Discharge of 0%.

In the space of maybe 15 minutes 8Ah were 'all of a sudden' charged into the bank? What factors would contribute to the SOC?

On one hand my concern is that the batteries are being fully charged. I am using Fixed Absorption which the MPPT is in charge of so a finished battery should be the result. But the abrupt SOC fluctuation concerns me.

All my setting are consistent with lead acid batteries and what Crown recommends. I have changed the Charged Voltage to 14.1 which is consistent on systems with solar charging, but the SOC issue was not affected by that change.

Any suggestions?

AkBound asked
AkBound commented ·

0 Answers

Why is my soc staying at 1%

I’ve had my 712 monitor for a while now, and it was working perfectly, however I’ve just put a new bigger agm battery in and it’s saying the state of charge is 1%, I can’t seem to reset or change this, the battery is fully charged and everything in the system is working normally, what have I missed??

Cooky17 asked
BruceS answered ·

1 Answer

how to sync ve.bus with SOC

Hi, I've a problem with sync Ve.bus data with SOC, so the graphic result always empty. Any Idea?






nicola.comino asked
super-wolf commented ·

3 Answers

Quattro 48/5000/70-100/100 120V Bulk and absorption LEDs flash synchronously and Vdc shown at VE Configure monitor is different to the battery actual voltage

Problem description:

After installation the equipment performed fine, completing the battery charging cycle. After the first grid AC power outage it switches to the inverter function and supplied energy from the batteries to the loads for about four (hours). When the grid AC power returns it switched to the charger function but showing continuous LED light in the mains on indicator and the bulk and absorption LEDs flash synchronously (simultaneously). Low battery is shown shortly on startup.


After switching off and on the equipment the error indication remains and the batteries are not charged. After recharging the batteries using an external charger and reconnecting them to the Quattro it doesn’t start using the manual switch.

Using VE Configure III the Quattro restarted and it shows that all default setting are OK. However the monitor shows DC voltage Vdc = 24.9V which is completely different to the 48 V measured using an external voltage meter. The SoC bar I the monitor also shows the battery charged . Bulk and absorption LEDs remains flashing synchronously.


Can anyone provide any orientation about this failure and its resolution procedure?

jrrujano asked
Paul B answered ·

1 Answer

Quattro SOC and assist battery with generator when higher load


We want to run generator to assist the batteries when higher load is needed. We have a MG Master LV BMS, Quattro inverters and CCGX. I'm new to this kind of system, and when talking on phone with MG on support earlier during some problems when commisioning, they said that I shouldnt use any assistans in the Quattros (Two-signal BMS and Generator start/stop) since all this are controlled by the CCGX, and no cabling between the BMS and Quattro (Discharg/Charge allowed).

The problem now is that when runninng on batteries and the load required is higher then the limit and asking for generator, the generator starts running, but does not assist the batteries, the generator take all the load and start charging the batteries instead, even when the SOC limit is reached, the generator keep charging the batteries over the SOC limit. I can see on the CCGX under Quattro, the state of charge has no values just (--).

Is that why the generator keeps charging the batteries even when the SOC is reached and the generator takes all the load when I want the generator to ASSIST the batteries?

orjolsen asked
Paul B edited ·

1 Answer

SoC stuck in 100%

I have EasySolar 48/5000/70 MPPT150|100. I faced with the issue that SoC is 100% always, even if batteries partly discharged or charging or discharging. I have configured the system according to 2.4.2 case B ( Could you give me some advice about what I should check or correct in order to measure real SoC?

Iurii asked
Mark commented ·

3 Answers

EasySolar-II SOC keeps falling and never rises?

Recently commissioned a EasySolar-II 3kva 48v system running PowerPlus Energy 4kwh ECO module. Setup battery monitor on VEconfigure, programmed mppt as per powerplus recommendation and all looking good. About 5 days later system shutdown on low SOC cut-out, went to site and batteries full and on float but SOC showing 15% so it had slowly gone down each day after i left but was in fact being charged fully each day. Where have i gone wrong??

Mark Dreyer asked
Robert Bazalgette answered ·

1 Answer

SOC not shown on CCGX.


We have a hybrid system with 6pcs Quattros on a 3-phase parallell system. We have MG Lithium-Ion LFP Batteries and a MG Master LV BMS. The Quattros are Connected to a CCGX on VE.Bus and the BMS on the VE. Can. Problem here is that I dont get the SOC from the BMS/Batteries displayed on CC GX.

Is there something I do wrong here?




orjolsen asked
orjolsen edited ·

0 Answers

Incorrect SOC


have installed Quattro 8kva with 8kW Fronius AC coupled with a CCGX 800Ah of batteries. It is an off grid installation with PV inverter assistant on.

The problem is my battery is completely discharged, but the SOC still reads 82%. My SOC when bulk charge is complete is 85%. I also noticed that when charging, once the SOC rises to 85% the quattro light switches to Absorption. it takes less than an hour for it to reach 85%.

It wasnt like this originally, the SOC used to go as low as 60% but never below, this started after i added more panels to my setup. i have tried all the charger settings and nothing changes. Also i feel because of this, my battery bank is never fully charged. After spending 30mins in the bulk stage, it stays in the absorption stage for more than 8 hours , and after this the SOC is still just 90%.

I have no other battery monitor connected and no other load is connected to the batteries aside th Quattro.

samsonodunola asked
Alexandra commented ·

0 Answers

SOC not goin below 60%%


have installed Quattro 8kva with 8kW Fronius AC coupled with a CCGX 800Ah of batteries. It is an off grid installation with PV inverter assistant on.

The problem is i can never get the battery to go below 60%, i'm guessing it has something to do with the depth of discharge but i'm not exactly sure where the setting is located.

samsonodunola asked
Alexandra answered ·

1 Answer

BBox SOC making large jumps with little load/charge

Hi all

The SOC on my B-Box 10.25kw battery stack jumps by around 25% at certain points in the charge/discharge cycle.

This became a problem this morning as I was expecting a 4 hour power outage. I had the SOC at 50% overnight, in preparation. The SOC dropped from 45% to 20% in a few seconds during the outage - power draw was in the region of 1kw at the time.

Then when recharging, it bounced up 25% again almost instantly.



I looked at the batteries this morning and noticed that one of the units does not have flashing lights on it. Am I looking at a failure here?



Sinbad asked
Sinbad answered ·

4 Answers

Battery SOC number on VENUS GX not updated by PV array but is by generator.

I have a Multiplus 24/5000/120 with 4xPylontech UP2500 and a MPPT Smartsolar 150/60 and a VENUS GX. The MPPT and the VENUS GX have both been updated with latest firmware. When I use VICTRON Connect app to see what’s going on I note that the battery SOC is NOT updated , in a positive way, when using the PV array to charge however ir does reduce the SOC according to the load drawn. If I switch the Multiplus on and off the SOC updates. The SOC is, strangely, updated on the VENUS GX when the generator is running. This is a problem as I have the gx programmed to start the generator when the SOC falls to a certain level and at the moment that would happen when the SOC is in fact muchhigher becaise of the input charge from the PV. Yikes! Any help much appreciated. John

jhass1 asked answered ·

2 Answers

Venus GX setting SOC battery

What would be the ideal settings/recommendations for SOC for the Venus GX/MPPT to maximise the use of solar power and minimise the use of (expensive) grid or generator power on a yacht. Details: battery OPzS 980 Ah, Victron Quattro 24/8000, MPPT 100/50, 4 x 350 Wp solar array, grid 230 V 16 A, generator 4 Kw.

During the day there is a discharge of about 4.1 Kwh when not present. When just visiting during the day and using some equipment discharge will lead up to 5-6 Kwh. Fully living on the yacht will lead up to 9-10 Kwh per day. Yacht is fully equipped with fridge/freeze, oven, dishwasher, microwave, combination washing machine/dryer, central heating, led lights, etc.

My idea was to let consumers discharge the battery to 40 % before the grid/generator kicks in and the Quattro will start charging. Should the Quattro then charge to say 70 % and let the solar take over to charge to 100 %? Or maybe it is better to let the Quattro charge to 100 %?

Any thoughts?

jurjenhoekstra asked
JohnC answered ·

3 Answers

Generator Stop after Grid is available


Two Quattros - setup in SplitPhase

ACin1 has a generator

ACin2 has the grid

Four MPPT Solar controllers with a total of 56 panels

Large Battery managed by internal BMS that communicates with Venus.

Venus configures:

ESS Configured

Generator Start when SOC is at 45%

Generator Stop when SOC is at 90%

Should buy from grid if it SOC falls under 50%,

Should charge Battery with solar

The problem: during the night time if the system gets to under SOC 45% because of grid failure, the system turns on the generator, if a few minutes later grid is available, it does not shutoff the generator. In my case an hour later I had plenty of sun to charge the battery. I have not been able to tell the system to prefer the use of grid over generator.

Is there a way to fix this?


Carlo asked
Alexandra answered ·

1 Answer


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