3kVA Multi; Venus GX; 3 x 2.4kWh PylonTech's and 3.96kW PV in ESS mode with feed-in allowed and 'Keep batteries charged'. DVCC on as should be, 2.31 Venus firmware and all other firmware no later than 3 months. Battery voltage rapidly drops to below 50V and SOC progressively during night from 99% to 94% in early morning just before sunrise. Is this normal? If not, how do I correct?