April 20, 20215 yr 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 :(. Edited April 20, 20215 yr by igg
April 20, 20215 yr Take the suspect panels down and set them up on the ground. Measure the volts of each panel..
April 20, 20215 yr What I've commonly seen in the field is faulty connections so before removing the panels completely I would suggest doing an inspection on any joints and then testing the cables from the panels to the inverter. If no problems are found then test each panel individually.
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