Friends:
I found the problem: There was a damaged wire immersed in water in the conduit. The voltage was fluctuating at the inverter end and solid at the module end. After testing the Isc a few times the conductor burned through and I was able to pull one end out of the conduit. So, the inverter was doing its job. We still have some wire nut splices which are working fine. I will eliminate them once I replace all of the wire, which is warranted since this is the second conductor failure. The conductors are all TWHN-2 which are wet rated. I need to upgrade to a better conductor. I have never had this type of failure at any other location. I suspect I should consider USE-2. I'd appreciate comments on this subject. My thanks to Steve Jefferson for personal attention to this problem and to everyone who responded. And lastly, I still wonder about the concept of "internally arcing" wire nuts. I wonder if there is any scientific basis for the claim. I will not be using them in PV circuits on general principles. If I do need to splice I will probably use a gangable tubular terminal block. There are more parts to this connector than a wire nut so maybe those might arc. We will see. William Miller Gradient Cap_mini Lic 773985 millersolar.com <http://www.millersolar.com/> 805-438-5600
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