... common negative. its suitable for RVs, Caravans and boats.Model no: 1. SLC20-DB, 12/24V, 10A (for both PV and load) 2 ... . SLC20-DB, 12/24V, 15A (for both PV and load) 3 ... . SLC20-DB, 12/24V, 20A (for both PV and load)Product Features: 1. State of charge(SOC) 2. PWM ...