Power dropped - Fronius


#1

Hi,
I was monitoring the solar generation today and observed a sudden drop in power generation at around 12:45 PM although the temperature was about 29 degree celius.

I was expecting a higher generation today, but it was below my expectation - https://pvoutput.org/list.jsp?id=86865&sid=77040

Has anybody experienced this before? Any thoughts?

Regards
Harsha


#2

I had a big cloud come over about a half-hour later than yours, making the same big dip - maybe more severe.
https://pvoutput.org/intraday.jsp?id=64310&sid=57175
The pattern up to around 4pm when the spike indicates the cloud cover blew away is also similar.
Solar panels work from light, not heat - it can swing up and down like a yoyo if there is scattered cloud blowing over and covering the sun, and vary greatly from day to day, while the air temperature may not move much at all.


#3

Completely normal response to clouds passing overhead, or anything else that shades the panels from receiving the sun’s light.

They are photovoltaic panels, not thermovoltaic panels.


#4

Thanks, was wondering something was wrong with my panels!


#5

Just out of interest, you have a flat roof?


#6

@u9026a, I have a single storey house with the roof pitch at around 22, however I have a double next to me which casts shadow after 4:30 PM now