Hello Victron peeps,
I successfully setup the ESS function with a Multiplus II, charge controller, smart shunt, cerbo GX, and a 48V lithium bank. I set it to sell excess DC coupled energy, which it does well. it is also setup not to discharge the battery unless the grid is lost The problem is when the charger (Multiplus) reaches the absorption voltage, the system starts oscillating between discharging the battery (sometimes by several hundred watts) and immediately charging it back up to the set voltage. I know that can't be good for the battery and it seems unnecessary. I also noticed that the Multiplus really doesn't want the battery voltage to go up or down from that set level, so it keeps oscillating in order to "clamp" that voltage. How do I tell the Multi to chill and leave the battery alone once the set voltage is met? Meaning, let the voltage go down on it's own according to the chemistry of the pack. Can it not bypass the battery and just use the charge controller current to invert back to the grid?