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Hello.
System:24 volt
I have two mppt (ve direct) connected to Cerbo GX. Also smart shunt connected to Cerbo. Normal charger is Victron ip22 which is set on float 27 volt. This charger is (and can not) connected to Cerbo. What is the big advantage for using DVCC and are the charge settings which I can access normally via Victron connect completely ignored now? What are the disadvantages?
The SmartShunt must be connected by VE Direct cable not a Smart Network.
On DVCC in this case you should set up sharing of voltage (STVS) and current (SCS). The MPPTs will now use the battery current and voltage provided by the SmartShunt not the values in the MPPTs. Therefore, if there is any voltage drop in the cables from the MPPTs to the battery this is ignored and any loads on the system are also ignored. With DVCC current sharing you can now set up the MPPTs to end absorption based on tail current knowing that the tail current is the actual battery tail current. Finally, if you have lead acid batteries then connect a temperature sensor to the SmartShunt or Cerbo GX and you can share this (STS) so that the MPTTs use the actual battery temperature not their internal temperature for compensation. The settings in VE Connect are still valid.
