[MudDog]

The MC-4 connectors seems pretty sturdy and seem like they would handle fairly frequent connecting/disconnecting.

They sell ends that you can attach to your own cable - for those you apparently need a special tool to make the connection water-tight.

For the pre-made cables they just click together. To release you squeeze a couple of tabs in and the connection comes apart.

I could actually probably get another 15-20' extension and use it to put one of the solar panels on a portable ground mount if I found myself someplace where there was too much shade on the roof.....hmmmm...