Hi all I have Panasonic 330w panels (x15). When temps are around 25C (best temp for the panels), I am seeing about 316W from each panel during peak. I am wondering if this (~4.3% efficiency loss) typical? If thats what you guys are seeing as well?
Ive yet to see my panels overproduce. And at this rate I dont think they will?
Today is our first day in the 90's F (~34C or so). They are producing 7% less due to the heat. Today I am seeing around 295W per panel, my particular panels say -0.258%/ 1C. So at 34C that is is today 34-25 = 9 degree over ideal temp 9 * 0.258 = ~2.3% efficiency loss. Which is a much smaller drop than what I am seeing at ~7%.
So I have three questions.
1) Should my base (at 25C) be higher? Or is ~4.3% efficiency loss due to AC -> DC conversion and other things typical?
2) The heat efficiency loss, is that talking about actual panel temp? Or ambient temp? Because I imagine the actual panels are much much hotter than the ambient temp of 34C? If we do the math assuming the 7% drop, the panels themselves must be around ~52C or so (assuming efficiency loss per 1C is correct). Anyhow, what is your guy's experience with this?
3) It seems like panels in the summer are less efficient than fall/spring, but this is made up for by having more hours of daylight? Is this your guy's experience?
Thanks!
Ive yet to see my panels overproduce. And at this rate I dont think they will?
Today is our first day in the 90's F (~34C or so). They are producing 7% less due to the heat. Today I am seeing around 295W per panel, my particular panels say -0.258%/ 1C. So at 34C that is is today 34-25 = 9 degree over ideal temp 9 * 0.258 = ~2.3% efficiency loss. Which is a much smaller drop than what I am seeing at ~7%.
So I have three questions.
1) Should my base (at 25C) be higher? Or is ~4.3% efficiency loss due to AC -> DC conversion and other things typical?
2) The heat efficiency loss, is that talking about actual panel temp? Or ambient temp? Because I imagine the actual panels are much much hotter than the ambient temp of 34C? If we do the math assuming the 7% drop, the panels themselves must be around ~52C or so (assuming efficiency loss per 1C is correct). Anyhow, what is your guy's experience with this?
3) It seems like panels in the summer are less efficient than fall/spring, but this is made up for by having more hours of daylight? Is this your guy's experience?
Thanks!
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