How to manually set the SOC 100% Voltage?

[MasterCATZ]

keeps thinking 48V is its 100% SOC and then drains the battery

because other things run from battery its impossible to sync it higher than 48v as that is the voltage another charger sustains it at

and I have other inverters that run from the battery bank

how can somebody set a voltage manually using VenusOS ?

any config file / database somewhere that can be changed via ssh ?

/data/conf/settings.xml
so far is all I have found bu the numbers are all a % how can I find where the data is stored that sets the range ?

would altering the discharge time 1750422840 help ?

<BatteryLife>
      <DischargedTime type="i" default="0" silent="True">1750422840</DischargedTime>
      <Flags type="i" default="0" silent="True">0</Flags>
      <MinimumSocLimit type="f" min="0.0" max="100.0" default="10.0" silent="False">100.0</MinimumSocLimit>

the VictronConnect phone app was meant to have the settings , I bought a mk3-usbc to use with phone and still can not find those battery settings

do I have n choice but to buy yet another thing just to get this stupid Multiplus II to have correct SOC% and get a SmartShunt as well ?

[pwfarnell]

Explain a bit about your system, what devices you have and how they are connected.

You can not set charged voltage with Venus OS. To set the inverter you use a Smartphone using VictronConnect and the Mk3 USB or a PC/!aptop and VE Configure and adjust the general page / settings. A Smartshunt would give best accuracy. You can even do this through VRM with VEConfigure and a pc/laptop.

7. General Settings

VictronConnect configuration guide for VE.Bus products

VRM: Remote VEConfigure [Victron Energy]

[MasterCATZ]

VE Configure had no working settings
adjusting the charge voltages did not adjust what the SOC would call 100%

VictronConnect had no working settings , the battery options where just not their for the multiplus 2 ,
like they apparently would be if I used a smartshunt

I did order a smartshunt today not that it will solve the main issue of not being able to stop SOC resetting on reboots

Lead batteries very first day it detected the SOC correctly as 50% at 48v then after the update to latest VenusOS version and firmware flash from 400’s to 500’s its been calling 48v 100%

its impossible for me to charge the battery bank up full as that would involve turning off the inverters that run my file servers , 5x dedicated UPS’s run off the main battery bank

and I have about a 100+ panel solar system that feeds battery bank using dedicated ~30x 30A MPPT chargers

Reason for adding victron into the mix is to allow exporting power etc from AC coupled micro inverters as I have about 100 of those as well

but everything seems to be going stray because of this stupid SOC value that can not be manually set

if I have only ESS enabled

it will just charge and discharge the battery at 48v to and from the grid and try pushing all the AC coupled solar into the battery as well at full speed ignoring charge limits

if I enable sustain it will allow AC coupled solar to pass out to the grid and trickle charge battery from solar but still discharges battery at 48v to the grid … ,
this is another issue however as because on 2020 grid it would allow export setting limits to be controlled , but would constantly kill grid connected when it hit 48v and go inverter mode and then AC couple would stop ect rendering unit useless for what i want it for

so going back to 2015 grid grid stays connected , but the export limits are all ignored
notexternaljoined.2015.VenusOS_b827ebec168c_inst_ttyUSB0_Interfaces_Mk2_Tunnel (thisworkedbutdischargedbattery) (sustainon.48v).rvsc (6.3 KB)
2020nbypass.grid.VenusOS_b827ebec168c_inst_ttyUSB0_Interfaces_Mk2_Tunnel (3) (Copy 3).rvsc (6.3 KB)
undoess.grid.VenusOS_b827ebec168c_inst_ttyUSB0_Interfaces_Mk2_Tunnel (3) (Copy 2).rvsc (5.3 KB)

low battery voltage warning is up yet it will still export battery power to grid under 48v …

currently this is just a test setup no loads
just connected to grid battery and AC coupled micro inverters

today its pulled 1.1kw out of the grid doing its random charge ups (that should be disabled)

Multiplus II 5000va Grid Export , AC Coupled Inverter , ESS VenusOS AC2 not working

so I rolled back to 2015 settings and it seems to be working (for now ) I altered the grid settings to be more inline with 2020’s 255V upper limit as 2015 had 265v set accept its discharging the battery as well .. but I can live with that if it stops draining it too low [Screenshot from 2025-06-20 11-55-18] notexternaljoined.2015.VenusOS_b827ebec168c_inst_ttyUSB0_Interfaces_Mk2_Tunnel (thisworkedbutdischargedbattery).rvsc (6.3 KB) I just love how it just ignores settings , discharge …

[M_Lange (Matthias Lange - DE)]

You say you have a 48V system but the screenshot of the settings from the BMV/SmartShunt shows a “charged voltage” of 14V.
That causes the SOC to jump to 100% too early.

[MasterCATZ]

14V ? where can I find that setting to change , does that mean its thinking its a single 12V battery and not 4x or did you /56 = 14v

I had also tried bumping the charge range all the way up to 60v before and it still did it

as I am planing on throwing this on the NiFe pack that has a 100% DOD

I just wish I had a way to set its voltage without it trying to do math at a % as its got no idea what input / output is going to the bank

at least its got 48v set at 96% SOC now so it stopped draining the battery when it was over 48v

highest I can get the voltage up is 54v after that the AC chargers are offline and I did not want to mess with them , most of the other inverters are 60v but my main inverter is not

also open to idea’s why it will disconnect from grid when using 2020 vs 2015 settings

grids voltage and hz are within spec 240v-250v / 255v 50.1~50.4

I am leaning towards because 2020 has got 50.25hz output power is dimmed …
grids normally 50.1hz and 2020 can not take a small 50.4hz bump ?

[M_Lange (Matthias Lange - DE)]

@MasterCATZ

14V ? where can I find that setting to change

In your first post you have added a screenshot from the settings of your BMV/SmartShunt.

Edit: You don’t have a BMV/SmartShunt? You should buy one, the SOC calculation of the MultiPlus can only see the current going through itself, other loads/chargers can’t be included in the calculation.

[MasterCATZ]

oh that was someone elses screenshot that showed their SOC settings that I do not have on the multiplus 2

its like the software is designed to make you buy more bits to access features ..

it knows the voltage , but no way to configure it ..

it knows that it is exporting , but negative values are not calculated so need clamp meters before it will put then in as exported power

still annoyed have I to cut off all the ends of my clamp meters because the new version no longer uses the 3 pin jack style and gone 3 wire version , so ordered some headphone extension cables to mutilate instead

[pwfarnell]

The Multiplus has a simpler battery.monitor and the only settings ate explained in the link I gave you to start with.

However, this only works if this is the only inverter. If you have other inverters running off the batteries, hpw can the Multiplus know anything. Victron battery monitors do not work by a voktage to SOC curve, tjey work by counting the energy (add up current x time) flowing into and out of the battery so a Victron battery monitor has to be connected to the battery and all charge sources and loads flow though it.

7. General Settings