BakfietsouderDoes anyone know what this is?
It’s attached to the cable that goes to the solar panel.
k͕̽/\̲̻͍ͬ̾̽tn͑̿͐ǰi̘͕̒̿å 
@lilletale Connector to a battery maybe?
@katnjia that’s possible. I just don’t know what kind of battery
@lilletale Lead acid batteries are common IIRC.
Easiest way to check is with a multimeter.