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marius123 avatar image
marius123 asked

MPPT 75/15 shows wrong Voltage

Everything worked perfectly fine for a quite a while but suddenly the solar charger shows a voltage that's not accurate. It is still charging though.

SmartSolar detects 12,95V battery voltage at night, so it's only the battery voltage, no charging voltage (Standard AGM).

A reliable multimeter shows 12,72V measured directly at the connection screws of the solar charger, so it cannot be some corrupt cable or anything.

The 20A fuse is fine.

Load output works fine.

I don't know whether there was any firmware update before the problem started, earlier this year everything was fine. Firmware is v1.59 now.


I could just modify the charging parameters accordingly, but that doesn't seem to be the best solution.

battery system voltage
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Wayne avatar image Wayne commented ·
@Marius123 so are you questioning the differential between 12.95 and 12.72?
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Paul B avatar image
Paul B answered ·

Please provide some screen shots of the displays and the multi meter. the difference may also just be your multi meter as well - also please send screen shots of the MPPT voltage setup pages

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rin67630 avatar image rin67630 commented ·

I have exactly the same behaviour.

LiFePo Battery voltage is 13,33 V (shown on the multimeter and the battery's BMS identically) and VictronConnect and Victron VE are both showing 14,18V.

Firmware is current V1.6.3


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