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Originally posted by David134
I dont know about the flex panels but the pv;s we just put up were schudeled to retain about 80% over 20 years. This was a commercial grade panel on a tracking system. One thing I did learn, When you lay it out, leave a air space under it if possible as the heat build up effects there output.
I think Dave Shapiro is still with them - (305) 358-7601. They do system quotes if you're not up to it. Peoplenomics subscribers can go reread Peoplenomics #362, from August of 2008 for details on how we designed and built-out our system here which is a modest 3.5kW of panels, a couple of 2 kW sine waves grid tied, etc. And been quite happy with the Interstate 6-volt golf cart batteries. All 16 of them (eight per bank).
Originally posted by mytheroy
reply to post by WatchRider
I would have checked that out before buying them, but that me.
I want to do the solar panel thing but I suck at soldering lol I'll go old school nothing beats old school
edit on 1-5-2012 by mytheroy because: (no reason given)
The output power of many panels slowly degrades at about 0.5%/year.
Crystalline modules are typically designed for a 30-year operational lifetime. Manufacturers perform accelerated life-cycle testing during the design phase to predict module longevity in the field. The actual silicon cells used in modules have an infinite life span and show no degradation after decades of use. However, module output can decrease over time. This performance degradation is the result of two main factors—the slow breakdown of a module’s encapsulant (typically ethylene vinyl acetate; EVA) and back sheet (typically polyvinyl fluoride films), as well as the gradual obscuration of the EVA layer between the module’s front glass and the cells themselves.
Module encapsulant protects the cells and internal electrical connections against moisture ingress. Because it’s impossible to completely seal out moisture, modules actually “breathe” to a very small degree.
The trapped moisture eventually leads to corrosion at the cell’s electrical connections, resulting in higher resistance at the affected connections and, ultimately, decreased module operating voltage.