Hi,
i have 3 pcs MultiRS Solar 6000 with 15kWp Solarpanels AND AC SolarEdge and Fronius Inverters with 20kWp Solarpanels.
The AC inverters should only charge the batteries if it is foreseeable that the MPPTs will not be able to fully charge the batteries today.
Otherwise, the AC inverters charge the batteries via the MultiSolar in the morning with a poor overall efficiency level and in the afternoon when the batteries are full, the energy from the MPPT is fed into the grid via the MultiSolar with a poor overall efficiency level also. It would be better if the AC inverters were only allowed to charge the battery if the MPPTs do not provide enough power on that day, so that the battery charge comes primarily form the MPPTs.
Victron does not seem to offer this out of the box. Are there any solutions with NodeRed?
You can achieve this directly in the Settings of the Cerbo GX: Settings / DVCC /Limit charge current.
Setting it to 0A will activate ESS#6 and only allow the MPPT to load the battery. This might not be the expected behaviour, but this is the result.
To return set the charge current to -1.
I am doing this with NodeRed as it is a bit more comfortable to a UI with switch to do that (SetCtrl_MaxChargeCurrent). My goal was to shift the battery-loading to noon, when the Solar power is exeeding my allowed feeding limit to the grid. Additionally “Setting / Limit managed battery charge Voltage” can reduce loading current from MPPT but this has to carefully done near the actual battery voltage or you might have the effect of subtantial amount of feeding from the battery to grid! Tuened off by setting to 0V.
I hope this helps, regards
solarbone