I have a solar system from Victron Energy, the main control unit is a Venus GX and all the units are linked together via VeDirect. I have a main battery is monitored by BMS712 and charged by MPPT 100/20 and MPPT 150/60. In parallel with this, I have a separate starting battery for an generator that I have an extra MPPT 100/20 connected to and controls the charging from a separate solar panel. The setup is also set up for this to be standalone, however it does not show the voltage of the actual starting battery it is connected to, but instead chooses to show the voltage of the main battery. It seems to me that this is because of DVCC. When I turn off DVCC, the correct voltage is displayed for the separate battery.
Is there any way to turn off DVCC for a single unit and at the same time monitor charging and voltage via VenusGX without deactivating the whole DVCC system?
No there isn’t.
A GX is designed for one battery system.
The simplest way is to disconnect the mppt from the GX and let it run itself with just a simple monitor from the start battery to keep an eye on it.
Maybe you can have the battery monitor set to none (i do not know have never tried it) but then the purpose of DVCC is removed.