Everyone, Just to add to this, I've seen multiple melted connectors that couldn't be traced to anything other than mixing manufacturers. I've seen some connectors where you can clearly seeing arcing on the pin itself and nowhere else. The crimps and the housing were fine. I've postulated it had to do with slightly different metals expanding/contracting at different rates. I've made it a very hard rule at my company to never mix manufacturers of connectors. When we order modules, we specifically have the PO call out the manufacturer of the connector (can't just be "MC4 compatible"). Typically we order that same brand of connectors, but sometimes we end up getting 6" jumpers made by a harness company (there are some connectors out there that can only work with #12 wire. Can't use them on #10 homeruns). It's drastically cut down on the number of melted connectors. We've averaged maybe 1 or 2 on 6MW projects over a year with this hard requirement versus 100+ we had on a 1MW rooftop project that mixed multiple manufacturers.
Steven Lawrence
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