Things that please you...

Neuk_ said:
Asks the Durbanite, what do you know about cold weather?
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I know that PV panels are rated at 25 degrees and that every degree lower increases voltage a percentage or so. Thats why some mppts blow up during winter because they didn't plan enough headroom.
 
wingnut771 said:
I know that PV panels are rated at 25 degrees and that every degree lower increases voltage a percentage or so. Thats why some mppts blow up during winter because they didn't plan enough headroom.
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They should've had enough head room for summer, cause even with the cooling effect the sun rays don't hit the panels as directly as they do in summer. I mean my peak in winter is now 3.2, in summer it's 4.3
 
wingnut771 said:
I know that PV panels are rated at 25 degrees and that every degree lower increases voltage a percentage or so. Thats why some mppts blow up during winter because they didn't plan enough headroom.
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Didn't know this until now. Time to do some adjustments.

You're a veritable gold mine of knowledge.
 
wingnut771 said:
10% headroom should be enough as we are not in Canada.
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For what? In summer yes, not in winter. If you've built in the head room for summer you'll be fine.
In winter you'll be happy to get 75% of your installed capacity, it spiking up past 110% in winter would require a very rare solar flare.
 
Lupus said:
For what? In summer yes, not in winter. If you've built in the head room for summer you'll be fine.
In winter you'll be happy to get 75% of your installed capacity, it spiking up past 110% in winter would require a very rare solar flare.
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What about cloud edge effect?
 
wingnut771 said:
What about cloud edge effect?
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Which is why you take this into account for JHB in summer ;-) in winter the cloud edge effect may get you to your peak in summer for a very very brief period. But in winter have never seen it come close to summer peaks, overall it averages out cause of less clouds, but peaks nah, CPT and DBN are already behind for solar generation capabilities compared to JHB so, doubt it would help there much either.
 
Lupus said:
Which is why you take this into account for JHB in summer ;-) in winter the cloud edge effect may get you to your peak in summer for a very very brief period. But in winter have never seen it come close to summer peaks, overall it averages out cause of less clouds, but peaks nah, CPT and DBN are already behind for solar generation capabilities compared to JHB so, doubt it would help there much either.
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What about east facing panels?
 
wingnut771 said:
What about east facing panels?
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Doubt that would make a massive difference, you'd build in the peak already and if you somehow go over your summer peak in winter it's a solar flare or the sun is being magnified.
 
wingnut771 said:
How much of that is the cold weather?
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First Pic is today, 2nd pic is 1 July. Fairly similar days. I'm fortunate enough to be able to monitor my load, and will add more consumption if the generation allows, mostly to the UF heating, and will stretch the charging of the battery to as late as possible. Big difference in sustained production, as well as what I was able to produce earlier and later in the day.

Side note, please explain regarding the headroom stuff above?Screenshot_20250704_181238_SOLARMAN%20Smart.jpgScreenshot_20250704_181302_SOLARMAN%20Smart.jpg
 
Hazy_Living@79 said:
First Pic is today, 2nd pic is 1 July. Fairly similar days. I'm fortunate enough to be able to monitor my load, and will add more consumption if the generation allows, mostly to the UF heating, and will stretch the charging of the battery to as late as possible. Big difference in sustained production, as well as what I was able to produce earlier and later in the day.

Side note, please explain regarding the headroom stuff above?View attachment 1832524View attachment 1832525
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Headroom for max mppt voltage. Panels output more voltage when it’s cold so allow 10% less than max mppt.
 
Can the solar queens please take your discussion back to the solar thread.
 
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