I have a battery monitor on my Mastervolt Combi system control panel with the shunt on the -ve side of the battery bank (420Ah 12V). I have 2 banks of PV into 2 Smartsolar MPPT 100/20's.
Three hours after coming off shore power at 100% charge the Mastervolt says 30% power left, 313ah used and discharging at about 7.5A with 13.56V. Victronconnect on the MPPT's says Solar = 42V, 1 to 3A, 50W network. Battery 13.6V, 3.3A and Float.
What's going on? Am I assured that the Mastervolt is telling lies? Maybe I have the -ve side of the MPPT on the wrong side of the shunt. What side should it be on?