Plug in a Charge Wizard Module and your Inteli-Power 9100 Converter becomes a completely automatic, intelligent, 12-volt charging system with three operating modes: Normal; Constantly monitors power usage, provides good charging capability, and reduces water consumption. Output charging voltage is set to nominal 13.6 volts. When system is inactive for some time, Charge Wizard automatically switches to Trickle mode. TRICKLE; Ensures battery remains charged and reduces water boil-off during storage or long periods of inactivity. Output charging voltage is set to a nominal 13.2 volts. BOOST; Constantly monitors battery for voltage drop (predetermined level) and quickly recharges battery or boost power when need. Boost mode can also be manually operated.