The Multi II will charge from the grid if your SOC is too low much below the min SOC. It looks to be a value between 5-10%.
So say you have min SOC=50% and there was a power cut and your SOC went down to 35%. As soon as the grid is back up the Multi will charge the batteries to 50% (or perhaps 45%) using the grid if your solar is not producing enough current.
@jykenmynie what you can do is to set the max charge current for the Multi (Ve.Config or VictronConnect).
Each MPPT also has it’s own max charge current which can be different from the Multi, so you can set a low limit for the Multi and much higher for the MPPT(s).
What I am not certain about is if using ESS influence the charge current up if it is different like the above.
