I have a CerboGX connected to a Multiplus in my travel trailer. Here is my problem. I have implemented ignoring AC to prioritize PV/batteries over AC in my system. However, I would like to be able to tell the batteries to charge or accept all AC without having to connect my Cerbo GX to a computer. For example, a storm is coming and I want to keep the batteries charged. It seems this is possible with ESS. Is it possible without ESS. The only reason I haven't used ESS is there is not a grid code for the United States, and I was warned that the system could leak power back if I implement ESS.