question

Hello Victron community,

I am having an issue with my SmartSolar 75 10 - it displays varying battery voltage not matching DMM readings across the MPPT solar terminals, battery terminals, and the SmartBatterySense. It is not charging despite battery ~11V.

My system is very simple and was working in a very similar setup recently.
I have a single 60W 18V panel on 7M of 4mm2 MC4 in sunlight. Load is off.

SmartSolar and SmartBatterySense disagree on voltages
These were taken seconds apart and show the charge state changing and voltage fluctuating - these fluctuations are not shown on SmartBatterySense or DMM.
Also note that the Yield today jumps back and forth between 0Wh and 40Wh.

VE.Smart Networking seems fine

Similar Posts

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Seems to be the same issue in a more complex setup

https://community.victronenergy.com/questions/255411/issue-with-the-mppt-reading-battery-voltage.html

Similiar issue, but voltage across MPPT battery terminals did not match the BMV and DMM as is case for me

https://community.victronenergy.com/questions/122377/smartsolar-mppt-10020-normal-voltage-but-no-curren.html

Different voltages at MPPT vs terminals due to incorrect crimp

https://community.victronenergy.com/questions/195795/discrepancy-between-smart-solar-battery-voltage-an.html

Thank you kindly in advance,

someoneinterested