The Intelli Power PD4590AV is the ultimate all-in-one 240V input, 50-amp AC/DC distribution panel / 90-amp converter with lithium Switch. The lithium switch can be used with lead acid batteries or lithium ion batteries; just flip the switch. With the built-in Charge Wizard. Our patented Charge Wizard 4-stage system uses microprocessor technology to add intelligent charging capability. It constantly monitors the RV battery and automatically adjusts the converter output voltage based on the battery’s charge status – designed to eliminate battery over & under charging problems associated with most other battery chargers and provide rapid yet safe battery recharging after dry camping.