https://www.altestore.com/store/Cables-Wiring/Solar-Panel-Wiring/c467/
Learn a low cost, easy way to connect two solar panels in parallel with MC couplers. Wiring two solar panels together in parallel keeps the voltage the same, but increases the current. This is helpful when wiring two 12V solar panels together to charge a 12V deep cycle battery with a PWM solar charge controller.