Inteli-Power 9100® Converter/Charger, 40 Amp 9100 Series Intellipower Converters provide safe, reliable, filtered DC power to all 12 volt lighting and appliance circuits. The built-in Total Charge Management System (TCMS) allows for easy addition of the optional Charge Wizard, a microprocessor-controller that constantly monitors the RV battery status and automatically selects one of four charging modes; Boost Mode - (14.4) to quickly bring the battery to 90% of full charge, Normal Mode - (13.6) safely completes the charge, Storage Mode - (13.2) automatically activates after 30 hours of non-use or Desulfation Mode - (14.4) for 15 minutes every 21 hours to prevent battery sulfation and stratification (THE leading cause of battery malfunction and failure.)