I have a working system with PV panels charging 220Ah/48V victron batteries connected to a MultiPlus providing AC, and optionally recharged by grid or (soon) a fuel generator. It is monitored by a VenusOS device.
I have the opportunity to have a second different battery bank (I already got them) and I would like to use it to extend the capacity of the system. The batteries are very differebt and I'd not want to connect them in DC with the first bank.
I wanted to know if it was possible to connect them on the AC local grid, possibly giving more power (sometimes the loads exceeds the first multiplus capacity). I'd imagine connecting them to a Quattro or Multiplus. Is it possible ? How can the second battery bank be instructed to recharge when the generator is up or on excess solar energy, and discharge when load is needed ? Is it automatic somehow ?
Additional question. When I have excess solar energy available, I'd like to power up some devices (heat up the water tank). Is there some way to do that ? At a distance (much like how the electrical grid sends signals over the wire to trigger the day/night mode)