photo sharing and upload picture albums photo forums search pictures popular photos photography help login
Type your message and click Add Comment
It is best to login or register first but you may post as a guest.
Enter an optional name and contact email address. Name
Name Email
help private comment
Compass Marine How To | all galleries >> Welcome To >> Terminating Solar MC-4 Connectors > Solar MC4 Connectors
previous | next
Solar MC4 Connectors

Solar MC4 Connectors

These are solar MC4 connectors the FEMALE on the bottom and the MALE plug on top.. Today more and more solar panels are shipping with MC-4 terminals and less and less with actual junction boxes. I still personally prefer a water tight j-box, and water tight gland nut, but not all panels ship that way.

The MC4 solar connectors are UL rated for 600V and up to 50A of maximum current. They also range from IP65 to IP68 rated (depends upon brand) which means they are fully "dust & water jet tight" (IP65) and can be submersed to 1 meter for 1 hour and still retain water resistance (IP68). The MC4 connectors are available in 14, 12, 10 & 8GA sizes.

MC4 Sizing:
14GA = 22.5A
12GA = 37A
10GA = 43A
8GA = 50A

They work quite well but on boats, but if not carefully installed, they can be a tad bulky and prone to being caught on things. That said, they are one of the better water tight electrical connections available for marine use. You don't have to use them only on solar connections and they could certainly be used for other applications.

Like any other project on boats this project will add yet another tool to your tool box.

other sizes: small medium large original
comment | share
Bruce Braley 03-Aug-2017 22:41
Yes, the previous comment is correct and the photo depicts these connectors on the wrong wires. + should be on red and - should be on black.
Guest 31-Oct-2014 21:23
The red wire should be wired to the positive which is termed the female in the description. The black wire should be wired to the negative or male