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crunch42 avatar image

Huge difference between battery voltage reading for MPPT in VictronConnect and multimeter

VictronConnect shows battery voltage around 12.1, but a multimeter on the battery terminals themselves and on the MPPT 100/20 charge controller's battery terminals both show 12.8. Defective unit?

MPPT - Solar Charge ControllerVictronConnect
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2 Answers
crunch42 avatar image

Thanks, it turned out to be a bad multimeter.

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Paul B avatar image

Two posibilites here


1. the testing volt meter is not correct, as a lot these cheaper meters can give incorrect readings

2. then the MPPT unit is faulty, take it back for testing/ replacement. ( I see very few to nill mppt units with this sort of issue)

3. MAYBE have you anything else conected ie tempature compensation for battery charging, is the regulator in a hot place, are the batteries and the regulator at the same tempature. etc ceck all the settings using the victron connect app

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It seems this is resolved, but just to add further possibilities to anyone reading this in future with a similar issue:

4. it’s possible cable from battery to charge controller is too long and/or thin causing unacceptable losses and hence lower voltage reading at the controller.