The HV (=High Voltage) model requires a 7V…28V power supply with open wires. The wires are held by tightening in a screw terminal on the top side of the board. The external power supply must be capable of supplying the Raspberry Pi and charging the supercapacitors at the same time. The required current depends on the voltage of the power supply. This model contains a Front-end DC/DC converter for stepping down the power supply voltage to 5.1V.
Part number for ordering: J4H-HV-TRM