Panel Relationship:I join the cables on the solar panel wire terminals, making sure the polarity is suitable. Connectors are wanted to connect multiple solar panels alongside one another into a string. (Solitary panels do not need to have connectors.) They can be found in 'male' and 'female' types built https://6mmsolarpvcable77777.amoblog.com/6mm-dc-solar-cable-for-dummies-51782740