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bomadsen avatar image
bomadsen asked

SmartShunt SOC synchronization with SmartSolar MPPT

I know! This question have been asked before, and I think I have read every answer twice...and I am still not able to get my system to behave as I want.

System consists of 2x24V 100Ah LiFoPo4 batteries wired in parallel, SmartShunt, SmartSolar Charger MPPT 100/50, MultiPlus-II 24/3000/70-32, Cerbo GX and some other bits that are not important here.

I tried to configure the SmartShunt as per. the manual:

Charge Voltage: 26,7 ( SmartSolar float - 0,3v)

Tail Current: 2%

Charged detection time: 3 minutes

But this resulted in SOC resetting to 100% every morning when the SmartSolar started charging.


Based on the description of what the parameters does, and the graphs I could pull from vrm, I then tried to set the charge voltage to 28V and lowered the detection time to 2 min. But now the SOC does not reset even when the SmartSolar is done charging.

Below are graphs of such a scenario:

battery-info.png

I do not understand why the SOC was not reset to 100% when the voltage was >28V and amperage was close to zero for many minutes?

Settings for the SmartShunt are:

1619185733358.png


Settings for the SmartSolar are:

1619185761638.png


I hope you guys can help here, because I don't understand it :)

MPPT ControllersSmartShuntSOC
battery-info.png (71.2 KiB)
1619185733358.png (233.4 KiB)
1619185761638.png (216.3 KiB)
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1 Answer
raulag avatar image
raulag answered ·

I have a setup quite close to yours and experience the same problem. And I find it strange that after more than one year nobody replayed, even though this is such a large community.

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kevgermany avatar image kevgermany ♦♦ commented ·
Please post your charger settings, shunt settings and tell us what's in your system. Prints of the charger display would help a lot,
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