HQRP Pair MC4 Solar Panel Connector male & female (M&F) for PV / Photovoltaic System plus HQRP Coas

I disagree with reviewers who say these connectors are overpriced. They are not, for what they do. They provide a positive latching seal, and as important they seem to be completely waterproof. I imagine they could be totally immersed in water and would not leak. Both male and female connectors have a tight wide soft silicone seal at the back of the connectors. The mating side of the "positive" connector has a red O ring that seals into the "negative" connector when they are mated together. However there are no instructions, so it takes a bit of pondering to understand how they should be assembled. It is important to crimp them correctly, not so much to make a good connection (I would recommending soldering them after crimping) but so they will fit into their respective shells and allow the rear seal to be pushed in completely. After crimping and soldering be sure they are straight and the edges of the crimp do not protrude. Be sure to examine the female connector on your cable or solar panel and notice how far the metal is recessed in the shell. Yours should be about the same.

Another hint to avoid getting + and mixed up when the stripped end of your cable is connected to the controller: Remember that your female connector that you will connect to the cable or solar panel male connector with the red O ring WILL BE HOT OR + END and the stripped end should be connected to the + side of the controller. The female that you attached to your wire is +. Your connector with the Red O ring will be negative, -. Clear as mud? Re-read this as you sit at your workbench until you puzzle them out.

One star knocked off for lack of documentation.

the mc4 solar panel connectors are just want i needed to connect my solar panels to a combiner box.it worked great!!!the shipment came on time as promised.i also requested extra internal clips for these connectors and they sent me two free.i really appreciated the excellent service.

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These connectors are very easy to put together and use. Why the 4 star....I don't believe they will acommodater any wire larger than 10 gauge, and you MUST solder the wire to the connector. No big deal, if you use a butane tourch/solder apparatus. Very happy with them myself.

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I purchased these connectors for my 100 watt solar system for my camper. I used them with 12 gauge outdoor lighting cable and they worked fine. I crimped them with a cheap standard crimping tool and then soldered them.

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These are the exact same parts that I have now..I ordered this part to make an even number of pairs..will buy more of the same when needed. Going to be using them in my motorhome for more than just solar panels.