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BFL13's avatar
BFL13
Explorer II
Jun 15, 2019

DIY MC-4 Connectors- 2nd Photo Added

I suppose everyone knows about these except me until today, but in case anybody does not, here it is.

There is a Male and Female version, so you need one of each to join your wires to the panel pigtails. Beware the metal pins!!! They are also male and female. No second chances if you screw up! The whole thing is an IQ test, like a Chinese puzzle, so be careful.

Before I learned about these, I was cutting off the MC-4s on the pigtails and connecting the pigtail wires to my #8 wires using various ways such as with wire nuts all taped up. Not very good! With these little things, you crimp the #8 you have to the proper pin and fit it all together, and now you can connect to the panel no fuss no muss!

http://www.wegosolar.com/products.php?product=MC%252dMALE-MC%252d4-Male-Clip-with-Pin
  • The ones in the link, when assembled, cannot be undone. (so the guy explained---I have not done one yet.) No second chances if you get the sexes wrong with the metal pins and the outside parts. Too easy to mix up the metal pins which will fit either, but only work with one. It is the metal pin that fits into the other metal pin inside the housing (also sexed)

    If you have some MC-4s with some wire sticking out, AFAIK it is the same thing. All you can do is use the wire to attach it all to another wire. (wire nut and tape?)

    I knew about wires with MC-4s already on them, useless to me. I have seen on here about cutting the wire in half, but wrong lengths for my use. These DIY ones solve all that.

    These DIY things are a "game-changer" for me.
  • Wire Nuts and tape?

    for shame bfl....for shame
    ;)

    My portable panels I am using 45 amp anderson powerpoles, as I use these everywhere else. Have to destrand 8AWG to 10awg thickness and shave the insulation square to get them to fit the housings.

    I've started my engine through a pair of these in parallel.

    I've kept all the MC4's I've cut off leaving a pigtail, will use them when I need a weatherproof, less temporary connection.
  • I guess I was more ignorant than intrepid. I dug right in and made all my cables. Soldered all the pins. Amazon has all these connectors too.
  • I chickened out and bought mine premade. Although I did embrace them immediately.
    Thanks for the tips.
  • I feel your pain brother. I had a learning experience that included several expletives that I won’t go into here.