AIMTOM 6.6Ft Heavy Duty Waterproof Solar Male/Female Connector to DC 5.5mm x 2.1mm Solar Panel Adapter Cable for Charging SPS-155 SPS-194 Power Stations, Solar Generators or Rechargeable Battery Pack;

How to Charge Portable Solar Generator with Solar Panels
Expand your solar panel under the Sun.
Plug the cable's MC4 connectors to solar panel's MC4 connectors.
Plug the DC connector to your portable solar generator's input port.

How to Calculate Runtime of Your Device Powered by AIMTOM Solar Generators
Run time = Watt-hour of your AIMTOM power station* 0.88 / rated power of your device
For example, assuming your device has a rated power of 30W, runtime of your AIMTOM SPS-155 will be 155Wh*0.88/30W=4.54 hrs (roughly calculated)
Actual runtime varies from every single application. Consult AIMTOM tech support for details.

CHARING AIMTOM POWER STATION WITH SOLAR PANEL
Note that this AIMTOM MC4 Charging Cable is engineered to be:
Male connector - Negative
Female connector - Positive

In some case, if your solar panel is found not charging your power station, just try to switch positive and negative MC4 connectors on your solar panel side, it will change the polarity and start charging.