I am an Electrical Engineer, and a radio Ham. I work with many types of connectors.
The contacts look like silver plated copper, which means excellent conductivity. The connector snap together so well, with a positive locking mechanism. I love them.
I would use a good quality crimp-er, and I suppose these could be soldered as well. Inserting some dielectric grease into the fitting before connecting would make them bomb proof. The grease ensures water can never get in, I'm not sure it could anyway with these in any case, because of the rubber seal, and the grease also prevents corrosion.
I'd say these connectors could stand up to outdoor exposure for the rest of my life and beyond.
My original plan was to use solder and shrink tubing, and make my own termination box. I am very glad I chose to spend a few bucks on this style connector.
Buy these and and the 2-1 junction connectors that mate...
These things fit perfect, at least the batch i got. They were better than the panel connectors because they had locking tabs, while the panel connectors did not have that little tab to lock the connectors together. One thing, i have a HEX crimper but decided to solder the conductor pin also since i don't want to deal with fixing anything on the roof for 20 years. Last thing, 8ga wire will fit thru the shell and pin will crimp perfectly.
Skip to 54 seconds to see pics of assembly. [...]
These worked well to parallel/series numerous 235w pv panels. They lock together firmly and will not come loose. However, don't bother getting removal tool--it's not necessary. They will come apart easily if both tabs are depressed simultaneously while pulling. I crimped and soldered without problem to #10 AWG copper. One caution: I mistakenly disconnected a string under a load of 72VDC at about 7 amps and it welded burrs and distorted the female and male pins which prevented reinsertion. I replaced the ends and all is well--but do not connect or disconnect under load. This, I am sure, is the case with all MC4 connectors and was a user mistake, item works well.
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