Hi everyone - I have an odd situation that I hope someone can shed some light on. I have an MPPT 75/10 that has my 48V propulsion bank connected as PV in and the battery out goes to my starter battery. There is no load connected. In the Victron Connect app, everything looks great - battery voltage is 13.4V and it's in float. I just went to turn on the generator and got no power at the panel. Having checked the breakers I took a voltmeter to the starter battery and it's completely dead - 3.5V. I have no idea how the app can read healthy voltage and the battery is pretty much dead. Any thoughts? Thank you in advance.
EDIT 10 Aug 23 - I followed advice and measured voltage from MPPT + to battery - and from MPPT - to battery +. The first was 2.4V and the other 10.3V so there is an issue somewhere with the positive wire from the MPPT. I suspect a dodgy fuse holder. Thanks everyone for your input and advice.