RD DPS-5015 Boosted PSU

Published on Sep 10, 2016
“RD DPS5015 Constant Voltage current Step-down Programmable digital Power Supply buck Voltage converter color LCD voltmeter 15A” from AliExpress (link below)
i want to use it with my solar battery bank. So I need to boost the battery power first and manage it before applying that power to the DPS5015 for me to use.