Leshen Posted March 25, 2021 Share Posted March 25, 2021 Totally cloudy day today in Jhb. Sun was out for 2 mins and production from a 9360w array reached 10400w. Yellow Measure, Paul Greeff and Chloe 2 1 Quote Link to comment Share on other sites More sharing options...
JaseZA Posted March 25, 2021 Share Posted March 25, 2021 Probably a combination of low temps and cloud edge effect - but it's always great to see more coming out than you paid for! Although I've still never got a better total for the whole day when it's cloudy/cool vs clear/hot... Calvin and P1000 2 Quote Link to comment Share on other sites More sharing options...
Coulomb Posted March 25, 2021 Share Posted March 25, 2021 2 hours ago, leshen said: Sun was out for 2 mins and production from a 9360w array reached 10400w. You're gonna bend that needle! ibiza 1 Quote Link to comment Share on other sites More sharing options...
Leshen Posted March 25, 2021 Author Share Posted March 25, 2021 1 minute ago, Coulomb said: You're gonna bend that needle! Lol amazing what cold panels can do Quote Link to comment Share on other sites More sharing options...
PaulinNorthcliff Posted March 26, 2021 Share Posted March 26, 2021 Yep. Noticed that also yesterday. Quote Link to comment Share on other sites More sharing options...
Adri Posted March 26, 2021 Share Posted March 26, 2021 What are "çold panels" ? How do they differ from conventional PV panels? Quote Link to comment Share on other sites More sharing options...
hoohloc Posted March 26, 2021 Share Posted March 26, 2021 18 minutes ago, Adri said: What are "çold panels" ? How do they differ from conventional PV panels? They are PV panels but because of the rainy/cloudy weather, their temperature is cool/cold when compared to when it is sunny Quote Link to comment Share on other sites More sharing options...
PaulinNorthcliff Posted March 26, 2021 Share Posted March 26, 2021 Further to this. I see MANY rooftop installations where the installer has mounted the panels less than 200mm from the roof surface. These panels generally overheat and will deliver sub-par performance. Most of my installations are free-standing so that the air can circulate freely and the panels stay cooler. ibiza and Richard Mackay 2 Quote Link to comment Share on other sites More sharing options...
Yellow Measure Posted March 26, 2021 Share Posted March 26, 2021 This is exactly why the sizing of an array is important. VoC matters. Quote Link to comment Share on other sites More sharing options...
Paul Greeff Posted March 27, 2021 Share Posted March 27, 2021 On 2021/03/25 at 1:11 PM, leshen said: Totally cloudy day today in Jhb. Sun was out for 2 mins and production from a 9360w array reached 10400w. Did you happen to take note of the change in voltage between warm and cold panels? Here you get almost 15% more power, so presumably this gain is split between voltage and current increase. It will be interesting to see how much this can increase the Voc so we get an idea of how much room we need to leave so we never hit the inverters max voltage. Quote Link to comment Share on other sites More sharing options...
Leshen Posted March 27, 2021 Author Share Posted March 27, 2021 35 minutes ago, Paul Greeff said: Did you happen to take note of the change in voltage between warm and cold panels? Here you get almost 15% more power, so presumably this gain is split between voltage and current increase. It will be interesting to see how much this can increase the Voc so we get an idea of how much room we need to leave so we never hit the inverters max voltage. Quote Link to comment Share on other sites More sharing options...
Leshen Posted March 27, 2021 Author Share Posted March 27, 2021 2 hours ago, leshen said: Much lower voltage with warmer panels Quote Link to comment Share on other sites More sharing options...
Speedster Posted March 27, 2021 Share Posted March 27, 2021 Same amps, 10% change in voltage Quote Link to comment Share on other sites More sharing options...
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