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teloth avatar image
teloth asked

Multiplus II GX 5000 SOC jumping to 100% with no reason , batteries nowhere near full

soc-2.jpg



soc-1.jpg

As per title , this happens at least once a week from what I can tell.


This morning , it has just jumped from 73% to 100% , solar PV only just started kicking in , system voltage is way below still at 53.80 volts , absorbtion is set for 55.70 on MPPT controllers and in Multiplus is set to assume 95% SOC at 55.70 volts.


Any ideas?


I have just downloaded the data in excel where it confirms this as well.


Please see attached screenshots

SOC
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soc-2.jpg (109.2 KiB)
soc-3.jpg (196.6 KiB)
soc-4.jpg (188.3 KiB)
16 comments
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klim8skeptic avatar image klim8skeptic ♦ commented ·
You forgot to include a screenshot of the inverters general tab, regarding SOC settings.
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teloth avatar image teloth klim8skeptic ♦ commented ·

I did not forget , as I already put that information in original message , " Multiplus is set to assume 95% SOC at 55.70 volts. " ie. state of charge when bulk is finished = 95%

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marekp avatar image marekp commented ·

Are you using "2 signal BMS" assistant or ESS with this settings set in it?

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teloth avatar image teloth marekp commented ·
I am not running ESS or any assistants.
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marekp avatar image marekp teloth commented ·
What battery you have?
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teloth avatar image teloth marekp commented ·
LifePO4 480Ah , not connected in any "clever" way like CANbus or anything.


State of charge is purely determined by Absorbtion voltages , in Multiplus , after the bulk finished. It works perfectly fine most of the time, but this phenomenon occurs once a week or so and it messes up SOC.


After 2 hours ago it happened this morning , it is obviously still showing me 100% SOC , luckily it is going to be an OK day today to truly hit 100% , but if it was a winters day , it will falsely claim 100% early in the morning , when in reality the SOC could be 70% for example and it will never reach where it is supposed to be. So I will go into the night thinking batteries are 100% , where they obviously are not.
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teloth avatar image teloth commented ·

@mvader or other Victron Gurus , would you mind looking at this to see what might be causing the issue?

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nickdb avatar image nickdb ♦♦ teloth commented ·
Get yourself a proper installer instead of arguing with people trying to help.

You won’t get any official help for batteries that aren’t on the compatible list.

Having lithium batteries without a bms or a properly setup shunt will just cause issues.

There are tons of topics here you can search for with all the information you need.

Its not a glitch, you just haven’t set it up right.

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1 Answer
snoobler avatar image
snoobler answered ·

Why are you complaining? You clearly don't care about actual battery SoC since you're using one that can't count the incoming current from the PV.

Contact your reseller for support.

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