The solution is based on the EG1163 chip, using a non-isolated synchronous rectifier BUCK topology to achieve an output of 12V/24V, 20A. The input voltage range is 30V - 90V (customizable for a wider range), with a maximum efficiency of 97%. It features constant current control and temperature protection, and can be customized for charging 13.8V lead-acid batteries and 12.6V lithium batteries, with an optional enable control line.