Buy DC to DC step down converter module – buck convertor – CA1235
Amazon.com: Boost Buck Converter, DROK DC 5.5-30V to 0.5-30V 5V 12V 24V Output Adjustable Power Supply Regulator Module, 4A 35W High Power Voltage Step Up Down Converter Board with Case LCD Display :
30V~10A Auto Step-Up/Step-Down DC-DC Converter Module – HandsOn Tech