Duo battery solar controller 1.Battery type selection 2.Charging priority setting 3.Charging frequency selection 4.RoHS CE Duo battery solar controller 10A 12/24V charge 2 battery(bank) Duo battery solar controller 10A is designed for two battery(or two battery bank) charging, with common negative. its suitable for RVs, Caravans and boats.Model no: 1. SLC20-DB, 12/24V, 10A (for both PV and load) ...