The efficiency of commercially available PV panels averaged less than 10% in the mid-1980s, increased to around 15% by 2015, and is now approaching 25% for state-of-the art modules.
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A panel's rated watts (also called its solar panel rating) help estimate how much power it can produce, how many panels you may need, and how your system might perform over time. Here's the tricky part: two systems with the same total kilowatts can generate very different amounts of.
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Shading is the single biggest variable between actual and simulated solar output. A chimney that covers 2% of a panel's area can reduce string output by 20–30% if bypass diodes don't activate correctly.
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As always, please feel free to call the Licensing Board for General Contractors at 919-571-4183, Licensing Board for Electrical Contractors at 919-733-9042 or the Department of Insurance/Office of State Fire Marshall at 919-647-0000.
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