When two panels operate in parallel the positive cables are connected and the negative cables are also shorted together. Paralleling increases the current at the max power point (Imp) while the voltage remains the same.

For example, the solar panels with 8Amps Imp and 18V Vmp, if two identical panels are connected the amps will be 16Amps and the voltage will remain at 18V. 

If only two panels are required the Multibranch MC4 connector is the easiest and safest method. The two positive males and two negative females can not be connected, that's why the multibranch connectors will fulfil this connection. 

What is the package?

- One branch connector accepts two male MC4s on the input and one male MC4 at the output

- One branch connector accepts two female MC4s on the input and one female MC4 at the output

As a result, the number of cables is reduced from two positives to one positive and two negatives to one negative. 

Wiring MC4 Equipped Modules in Parallel: