If 6Volt panels are used, output would be 6 or 12V depending on setting.
4 Input ports: Female 3.5 x1.1mm
2 Outputs: Male 5.5×2.1, and a female 3.5×1.1mm plug.
A blocking diode prevents charge flowing from a battery back through your panel(s).
Battery Storage Options…
6V Setting charges USB batteries…