Originally posted by teknatronik
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It really depends on where you are located and what angle the panels are facing. But even if you are at the Equator with total sunshine those panels may not provide more then 90% of their nameplate wattage. That 255 watts is really Lab results and not true field results.
Your system may also have wire that is too small to stay below the 2% voltage drop. Your system will lose if it is not properly wired or if you have a inefficient charge controller.
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