Smartshunt 500A SOC not in sync with Meritsun BT battery SOC

I have two panels with separate Victron regulators with - connected to the smartshunt and + to my Lithium Bluetooth Heat Pro III 200Ah battery. All load is also connected the same way.

The built-in Meritsun battery monitor shows far less remaining capacity than the smartshunt does. Is there anything I can do to keep them more in sync?

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Alexandra ♦ commented · Jul 15, 2023 at 03:55 PM

@henrik

Can you share your bmv settings. They probably need tweaking

Does the meritsun show discharge AH?

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henrik commented · Jul 15, 2023 at 04:13 PM

@Alexandra Thanks for the swift reply!

The Meritsun is pretty stupid and doesn't show anything more than the picture (except for voltage/current) :/

Here are the smartshunt settings:

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screenshot-20230715-180919.png (168.7 KiB)

mvas henrik commented · Jul 15, 2023 at 04:19 PM

This is what matters ...

At what voltage does the Smart Shunt re+calibrate to 100% SOC. At what voltage does the MeritSun re-calibrate to 100% SOC. When these two voltages are exactly the same then the two % SOC's should have minimal difference, assuming the both shunts can accurately ( or identically ) measure amps flowing in/out and both compute % SOC the exact same way (math formula) with given parameters.

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