Hello,
for photovoltaic systems installed afterwards, it is clear that they are simply mounted on the roofs, but why is it done this way for new buildings as well? It would be simpler and probably cheaper if a basic metal tray were installed under the solar panels.
What speaks against this?
Regards, dieter_m
for photovoltaic systems installed afterwards, it is clear that they are simply mounted on the roofs, but why is it done this way for new buildings as well? It would be simpler and probably cheaper if a basic metal tray were installed under the solar panels.
What speaks against this?
Regards, dieter_m
T21150 schrieb:
Yes – unfortunately, the solar cells become very warm, which reduces their efficiency (a common frustration for every photovoltaic system owner).That’s why my highest daily output last year was on a day in April. (At least, I have no other explanation for it.)
f-pNo schrieb:
That’s why my highest daily output last year was also on a day in April. (At least, I don’t have any other explanation.)Neither do I.
For example, on the west side, I have about 410 V (volts) at no load, without power. When the modules warm up in the afternoon, this drops to about 360 V (volts).
My forecast also predicts lower yield for June compared to May, probably because the reduction in performance due to heat has the greatest impact.
T21150 schrieb:
Me neither.
Example: On the west side, I have about 410 V (volts) at no load, without power. When the modules heat up in the afternoon, it drops to around 360 V (volts).
My forecast also predicts lower output for June than for May. Probably because the reduction in performance due to heat has the greatest impact.Last year, the total production in June was already higher than in May. July was higher as well. August was, I believe, lower (but the weather was terrible).
f-pNo schrieb:
Last year, the total production in June was already higher than in May. July was higher as well. I think August was lower (but the weather was terrible then).I'm honestly curious. I don’t have any actual data yet. Last summer here was basically a downpour.
Despite a weak second half, May is already over 150 kWh above the forecast.
Today, however, the severe storm made it feel like the North Pole here. Output was nearly zero. It just started again—20 watts from the roof, rain, darkness like 9:15 PM.
Our best photovoltaic day last year was in July, with 50.15 kWh. This year, it was in early May (May 5th) with 48.79 kWh. We have a purely south-facing system, and on those days the sun was shining fully, which means it must have gotten quite warm—especially the July day was certainly very warm. However, the heat didn’t seem to have much effect. Much more significant was the low consumption around that time on the May day when the peak yield occurred. So the system had to be throttled; otherwise, it would certainly have produced more than 48.79 kWh. You can clearly see in the picture how the consumption peaks (green) generate yield peaks... In our case, the system is not throttled when there is matching consumption, so we can use not just 70% but the full 100% of the yield.
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