The PD2120 is a 20-amp Electronic Marine Converter/Charger able to charging as much as three separate banks of batteries on the same time. It accommodates a microprocessor that repeatedly monitors battery voltage, then mechanically selects one in all four operating modes to make sure protected, rapid recharging cycles. The Storage Mode and the Equalize Mode of operation ensures minimum battery gassing and water loss at the same time as preventing battery stratification and sulfation. All Inteli-Power chargers are designed to satisfy the stringent requirements of the Marine environment and are UL listed for safety. A digital meter displays current, voltage, operation mode, blown fuse indication, and battery kind. Four-Stage Charging System- patented Microprocessor repeatedly monitors battery voltage and mechanically selects probably the most four charging modes; BOOST, NORMAL, STORAGE or EQUALIZE. 3 Diode Isolated Outputs- permits the converter/charger to charge three separate banks of batteries. Each and every output is able to handling the entire rated current of the charger. Patented Reverse Battery Protection- prevents converter/charger from being damaged if the batteries are unintentionally attached to the charger in reverse. Over Voltage Protection- prevents high voltage spikes from damaging the converter/charger. Electronic Current Limiting- limits the output current to the utmost rating of the charger to stop overheating and damage as a result of shorts or over the top quite a bit. Variable Speed Intelligent Cooling Fan- most effective runs as fast as required to care for a more constant operating temperature throughout the converter/charger. This option reduces thermal stress as a result of fans that cycle off and on. Programmable within the Field- to offer optimum charging profiles for lead-acid, gel-cell, or AGM batteries. Regulated Output Voltage- prevents AC Line voltage variations from being transmitted to the batteries and 12 volt circuits.