Ah. Mathematicians. I went up on my roof and measured the Sun's position at several times during a day. And along with this I measure the "horizon" due to some of my, and my neighbors, trees to see what shadowing they would produce. Brent On 6/29/2020 7:50 AM, Henry Baker wrote:
I'm considering putting a solar PV system on my roof, and I thought that I should be able to calculate most of the numbers myself from first principles. I have searched for so-called online 'calculators', but found that most of them are aimed at idiots.
Here's what I expected to find:
A formula giving the exact sun position throughout the year, given latitude and longitude, as well as a factor which handles the distance from the sun w.r.t. time.
Now this only provides the *input* energy.
I now need to overlay this with average *weather* data on a per-hour basis to get the expected net energy.
Finally, I need to *integrate* these data over an entire year to get the values for my own house.
There may be such an online calculator, but I haven't been able to find it yet.
It may be possible to factor the weather info out of the integration, so that I could 'correct' my location sunlight & weather data with my own lat/lon azimuth (angle of my house) and roof angle, but I'd need to see the equations to find out if this factoring is possible.
I presume that someone on this list has already done these calculations for their own home?
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