January 11, 20233 yr I don't know how best to frame it, but if it has been answered, apologies, please point me to a post. I have 2 strings on a 8kw sunsynk Artsolar - 6 x 350 Watt - Mono - Full Black (They are the large square cells) Artsolar - 8 x 545Wp 144 Cell Mono Black (they look like half cells) They are mounted as two rows on the roof, identical orientations. I've noticed on cloudy days that when the illumination is low, their output is very close together, but on sunny days, they would be far apart. One would think that the one being more than twice as big that if the smaller string is doing 240W, the other would be doing 500W, but it is more like 240W/320W. I wouldn't normally nitpick, but it adds up and it is interesting. So i am interested in thoughts and ideas how that would happen, or if it is even a feature of the type of panel, the bigger panels being a different construction resulting in less efficiency in lower light? Running close together Almost double you can clearly see how they quickly deviate to twice as much as intensity changes during the day, but "squish" together when it is low. I've checked several days and it is about the general theme, that the 545W string is outputting less in similar (but low) light conditions than the other string in a non-linear fashion. Cheers!
January 11, 20233 yr 11 minutes ago, Vertigo said: I've noticed on cloudy days that when the illumination is low, their output is very close together, I'm guessing that at this low illumination, you get only, say 400W/m^2 and under the right conditions/low enough W/m^2 you may get identical output between the two strings... this may be a reason to rather go for lower W panels, since under cloudy conditions you may effectively be getting more ! for your $... in fact usually the lower W panels also cost less/W than the higher powered panels... Edited January 11, 20233 yr by Kalahari Meerkat grammatik
January 11, 20233 yr 7 hours ago, Vertigo said: I don't know how best to frame it, but if it has been answered, apologies, please point me to a post. I have 2 strings on a 8kw sunsynk Artsolar - 6 x 350 Watt - Mono - Full Black (They are the large square cells) Artsolar - 8 x 545Wp 144 Cell Mono Black (they look like half cells) They are mounted as two rows on the roof, identical orientations. I've noticed on cloudy days that when the illumination is low, their output is very close together, but on sunny days, they would be far apart. One would think that the one being more than twice as big that if the smaller string is doing 240W, the other would be doing 500W, but it is more like 240W/320W. I wouldn't normally nitpick, but it adds up and it is interesting. So i am interested in thoughts and ideas how that would happen, or if it is even a feature of the type of panel, the bigger panels being a different construction resulting in less efficiency in lower light? Running close together Almost double you can clearly see how they quickly deviate to twice as much as intensity changes during the day, but "squish" together when it is low. I've checked several days and it is about the general theme, that the 545W string is outputting less in similar (but low) light conditions than the other string in a non-linear fashion. Cheers! If in Gauteng then the date of the graphs we had pretty low yields and peaks from PV. Yes I saw you mentioned in low sun conditions. Only when seeing Watts x panels at about 80% of PV can one see that each string is producing as expected on a clear day. I doubt that normal vs half cut sells will make a difference under the same irradiation. No reference is made of battery SOC or load on the inverter. Edited January 11, 20233 yr by Scorp007
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