I have a mix of MC4 connectors in my solar panel installation. One thing I noticed is that not all MC4 connectors match well with different brands. I've tried connecting these MC4 connectors to others and they seem to connect fine. The female pins are 36mm, so they are more likely to connect to different brands. I used them perfectly with 10 gauge wire. They curl well, stay tight in their case and I've used them 4 times with success. They appear to be well designed and made and I will exclusively use them in the future.
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