Victron smart mppt 100/20 showing wrong voltage

[Cragsmorton (Craig)]

Victron smart mppt 100/20 showing wrong voltage in the app

It jumps out of bulk charging mode very fast into absorption as the voltage is showing as wrong.

It jumps up to 13.8 or 14.2v in the app, but the terminal is only circa 12.5v .

Tried a few battery’s.

What will the reason for this be as I can’t charge my battery from 20% charge to full at a 1 or 2 amp max charge . Would take days

[pwfarnell]

This is often caused by the fuse in the bottom of the MPPT having blown, bottom left in the picture below. The MPPT internals are disconnected from the battery terminals.

[cyclemat (Maik)]

how big is your battery cable to the mppt and how long ?