Will ask that information from the installer10-15% due to heat alone. Again, check the NOCT rating on your panels.
appreicate the help
Will ask that information from the installer10-15% due to heat alone. Again, check the NOCT rating on your panels.
As measured from flat? Horizontal? Up and down is 90⁰3kW array at 29° tilt.
As measured from flat? Horizontal? Up and down is 90⁰
OK but am asking theoretically , say you have an array facing the optimal direction, simplest form, but bloody hot like where i am, in that situation , how bad is the degrading due to heat ?
Sorry. Got sidetracked by your 29° reference. I'll send you a DM.Not sure what we're debating. OP was asking:
I presented him with day's worth of data from a nearly perfectly oriented array in a warm-ish climate only a few degrees cooler than his, but with delightfully minimal humidity.
The sun moves 46° between the winter solstice and the summer solstice in the sky. Therefore if you point your panels at the equinox position (the point where the day and the night are equal ) then the Sun moves 23° above that plane in the summer and 23° below that plane in the winter.
Sorry. Got sidetracked by your 29° reference. I'll send you a DM.
At equinox, sun is at 0 latitude.
I'm at 34° latitude. Array at 29° will be perfectly aligned when the sun is at 5° shortly before the autumnal equinox. I'm calling <5° off perpendicular as "nearly perfectly oriented."
The data provided was for about 16 days before the equinox. For calculation convenience, assuming 90 days from summer solstice to autumnal equinox and a linear progression of change in latitude from 23.5° to 0°, sun is at 5° latitude 19 days before the equinox.
Meets my "close enough" gauge quite nicely.
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I think I figured out our disagreement. Your graph above and your comment about 29° being perfect was dated 3 months ago. But the conversation you're engaged in is happening today 3 months later at the solstice. Thus the confusion I thought you were saying 29° tilt for today was perfect when clearly it's not. Actually it should be more like 57 degrees tilt measured from 0° horizontal for the winter solstice on December 21st.
29° tilt at 34° north latitude biases summer production. It is a more shallow tilt than even the equinoxes.
I have seen on some days that my solar production ramps up in the morning and then stops at around 2.8kW where it stays for a few hours before it goes down during evening.
I have a 5kW Deye, 5kW Volta battery and 6 x 545W = 3270W solar panels. I have seen the panels produce near that maximum during cooler lightly cloudy days where the clouds scatter the sunlight.
Flagish3kW array at 29° tilt. Almost perfect tilt.
Clearly not a perfect day with intermittent cirrus clouds. Ambient was 29°C.
View attachment 124922
About 12% below rated.
This is also at 6500 ft elevation. Thinner atmosphere means a little more sun than average.