question

trulsla avatar image
trulsla asked

Why is my SOC resetting to 100% every time my SmartSolar starts charging?

I'm struggling with system always resetting to 100% SOC when the solar charger kicks in. I've tried to increase the absorbtion voltage slightly (0,25V above the same in MultiPlus), but it still resets. Today it was showing 82% and as soon as the solar charger kicked in it reset to 100% again.

I have the following setup:
1x 300Ah lithium battery + 105Ah AGM starter battery
2x 160W solar panels
SmartSolar 100|20
MultiPlus C 12|1600|70
SmartShunt 500A
Cerbo GX + Touch 50


1617885437045.png1617885399843.png

MPPT Controllersbattery chargingSmartShunt
1617885399843.png (39.9 KiB)
1617885437045.png (15.0 KiB)
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klim8skeptic avatar image klim8skeptic ♦ commented ·

I have a somewhat similar system.. 95% solar input..

Proper setting of the Mppt chargers and BMV for solar input has to be considered.

Proper integration of your GX device and multi/mppts also needs to be considered.

You will need to post your battery details, Mppt settings for battery, and your BMV settings.

Also multi settings should you be regularly charging the batts.

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trulsla avatar image trulsla klim8skeptic ♦ commented ·

SmartShunt settings:

smartshunt-settings.jpg


SmartSolar settings:

smartsolar-settings.jpg


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smartsolar-settings.jpg (214.1 KiB)
klim8skeptic avatar image klim8skeptic ♦ trulsla commented ·

I was going to say bad things, but I read the manual.

Plz change your settings to match..

smart-shunt.png

Give it a few days and post back plz.

Cheers S.

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smart-shunt.png (75.1 KiB)
seb71 avatar image seb71 trulsla commented ·

SmartShunt

"Charged voltage: 0V"


That is the main problem. Some other settings are also incorrect.

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1 Answer
Stefanie (Victron Energy Staff) avatar image
Stefanie (Victron Energy Staff) answered ·

Hi @TrulsLA,

please check your Charged Voltage setting of your SmartShunt. For your Lithium this should be somewhere around 14.0V.

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klim8skeptic avatar image klim8skeptic ♦ commented ·

+1 to that.

Thanks Stefanie.

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trulsla avatar image trulsla commented ·

Thanks. Seems like that helped.

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