I have two adjacent properties about 40m apart running (more or less) twin systems each based on a Multiplus II 10kVA, Cerbo GX, solar charge controllers, a bank of LiFePO4 batteries and some legacy A/C coupled generation as well. For a bunch of reasons I don't think it's practical to get rid of one meter connection and merge the systems but it would be so much more efficient if I could have the two battery banks balance with each other and absorb any excesses first before losing any residue to the grid. Is there some gadget that could do this? I envision possibly even a new product that does some kind of isolated DC-DC connection between the two DC buses whilst appearing to each side as another charge controller that can potentially source or sink power. But I'm really open to any ideas here...anyone got at least a starting point for me?