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Old 05-24-2019, 06:18 PM   #1
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Default Latest REC solar modules and "smudges" under the glass

Has anyone out there had experience with solar modules from REC having marks on them that look like a grease mark but turn out to actually be under the glass due to a manufacturer defect? The solar company that I work for in New England has seen a few dozen of these. Some have installed them for customers who don't care about asthetics. However, my concern is that these defects could actually cause problems in the future. I'v seen some string inverter systems have problems with constantly throwing arc fault errors and some happen to have REC mods on them. I'm wondering if there could be a connection with these "smudges" and electrical noise on the system. What do you all think?
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Old 05-31-2019, 05:24 PM   #2
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We haven't used REC mods lately. As far as the arc-fault codes go:
- are you using Solar Edge inverters?
- are you megging all your DC conductors after the array has been bonded to the EGC?
- do the arc fault codes follow the inverter or the strings?
- are your homeruns direct (no splice) between the strings and the inverters?
- if there are splices, are you changing from #10 to #8 using a touch safe photovoltaic connector (mc4)?
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manufacture defects, rec modules, solar, solar energy, string inverters

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