MultiPlus measuring wrong voltage

Q&A and troubleshooting
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1

Hey everyone,

I have a Victron MulltiPlus 12 / 1600 / 70 installed on my boat together with LiFePO4 batteries. The problem is that according to Victron connect, the Multi shows a battery voltage almost 1 V higher than the actual battery voltage measured directly at the batteries and by the SmartShunt (14,2 V measured by the Multi - 13,2 measured with a multimeter at the batteries). The same 13,2 V are also measured directly on the DC input of the Multi, so there is no fault in the cabling. This causes it to switch into Absorption thinking the batteries are full when they are at about 60% SOC in reality. Interestingly when I set the Absorption voltage up to 15,2 volts for testing, the Multi shows a rising battery voltage, when in reality it stays the same (measured by Shunt and Multimeter).

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That does not sound ok. Did you also try to use the extra battery voltage wiring to get a proper reading? This should only matter when charging, but just curious if this gives an other reading. Otherwise, when you connect the smartshunt with a bluetooth network to the multiplus, it should use that voltage reading as the truth. If all this does not help and you are sure youve done the right measurements something seems wrong with your multiplus.,as far as I am aware, there is no Voltage software calibration possible in the Multiplus.

1 Like
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Have you compared the readings between the app and multimeter when there is no load and no charge happening?