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Incorrect battery voltage reading on MPPT 150/45

The MPPT 150/45 charge controller is connected to a battery of 4 x 12V cells and is set to 48V. Although the multimeter indicates a Voltage of 55V across the battery, the MPPT is only indicating a Voltage of 18.89V across the battery. Does anybody have any advice?

MPPT SmartSolar
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klim8skeptic avatar image klim8skeptic ♦ commented ·
Have you checked the voltage at the mppt's battery terminals?
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johann-weinmann avatar image johann-weinmann klim8skeptic ♦ commented ·
The voltage at the MPPT’s battery terminals measures the same as over the battery itself. The MPPT however displays/measures a lower voltage by a factor of 3, e.g. the battery voltage is 51V but the MPPT only displays/measures 17V.
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