With an SBV, the only option is to keep the solar inverters on the grid side and connect the SBV AC input to the grid as well. Then power your loads through the output of the SBV (consider the maximum output power/amperage of that output though!). I believe this is also what the home panel (when it finally becomes available) will do, just wiring the SBV's output back into your fixed mains wiring. Set up an AC charging schedule to recharge the SBV during daytime, hopefully mostly from solar.