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Solar panel fault finding help


igg
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Over the last week or so I've been noticing my solar yield has dropped off sharply. I have a 2x2 array of 405w CS panels.

It looks like at some point in the day, one of the strings will stop producing. I've just pulled the fuses on the string 2 with no drop in solar yield. All 4 panels are currently in full sun; string 1 is measuring a 68-70v, while string 2 is all over the place from 22-38v.

What would be my next diagnostic step here? I'm assuming one of the panels in string 2 is faulty.

Also, does anyone know the warranty duration on CS panels; this install isn't even a year old with the panels being extremely difficult to access :(.

image.png.fa92825e847ee3e54233f6a8b4322ff1.png

Edited by igg
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