I need to replace an entirely broken 12V offgrid system of a remote northern cabin in real cold climate. The new setup is: Smart Solar 100/50 & BMV-712, Panels 2 x 250Wp, Batteries 2 x 6V AGM DeepCycle 190Ah. So far the old system was shut off during the winter period where there is twilight for 4 hrs only. (Batteries fully loaded , then disconnected for 6 months). Now I am wondering if it would make sense to leave the System powered up so the Batteries would be at least kept alive. However I did not find any clear information if the Smart Solar's self consumption of 30mA is always the same or if will be less if solar power is gone. Appreciate any information and hints how to keep the batteries alive.