Does anyone knows how the “Estimated Power” is calculated (formular) ?

I would like to write a script, that compares the “Estimated Power” with the “Generated Power” to count the hours of sunshine. Thanks for any hint

# How to calculate "Estimated Power"

**jogi19**#1

**Pedro14**#2

I use the efficiency figure on pvoutput which is calculated by Generation/system size, as to the hours of sunshine solar panels receive.

https://pvoutput.org/list.jsp?userid=545

**jimdcollie**#3

Hi, You might also like to look at< Live view page > then go to < Analyse > 5 over from live on the same line Jim

**jogi19**#4

Thanks for the answers. Maybe may question is not clear. I want to know, how the “Estimated Power” is calculated. So far, I’ve found a nice Python project “pysolor” that makes it easy to calculate the insolation, altitude, and azimut of the sun. Maybe this will help do calculate the estimated power on a sunny day.

If my generating power is in the range of the expected --> sun is shining

If my generating power is far below of expected --> no sun.

I guess this will work good during the day, but on dawn and dusk ???

**jimdcollie**#5

ok it worked out from what you put in settings for your system and the temperature at your location.

and i am think by estimated power you mean the isolation ???

**jogi19**#6

Click “Your Outputs”–>live–>Insolation

move your mouse over the blue curve. Here it says “Estimated Power”.

I just want to know, how this value is calculated. I know there are using the possition of the sun, array tilt, system size, and facing of the panel. I just want to know the formula (mathematical) for my own calculation