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System Advisor Model (SAM)

Solar Azimuth by Altitude Beam Irradiance Shade Loss Table

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d.goodrick
Topic Author

31 Mar 2022 20:33 #10785 by d.goodrick

Solar Azimuth by Altitude Beam Irradiance Shade Loss Table was created by d.goodrick

I was looking at how to specify shade losses with the Solar Azimuth by Altitude Beam Irradiance Shade Loss Table but I couldn't tell from the documentation what the column row values should be. The help says:
```
3.In the top row (highlighted in blue), type a set of solar azimuth angle values in degrees between zero and 360 and increasing monotonically from left to right.4.In the leftmost column (highlighted in blue), type a set of solar altitude values in degrees between zero and 90 and increasing monotonically from top to bottom.```

Can I input just the angles I care about (90...270) and (20...45) or do I need 0-360 or 0-90?

Do the values need to be evenly spaced?

The documentation suggests that 0 and 360 are both invalid values (between). Is this the case?

I tried changing these values in the shading tool and changing them didn't seem to have an effect on the calculated production.Using SAM desktop on a Mac.

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pgilman

31 Mar 2022 21:02 #10787 by pgilman

Replied by pgilman on topic Solar Azimuth by Altitude Beam Irradiance Shade Loss Table

Hi Dan,

The values should increase monotonically, but do not need to be evenly spaced.

I think the acceptable range of values is 0 ≤ azimuth < 360, and 0 ≤ altitude < 90.

You can use the "Sun altitude angle," "Sun azimuth angle," and "Subarray [n] External shading and soiling beam irradiance factor" output variables to see how the factors are being applied.

If you need help troubleshooting, please attach copy of your .sam file with the shading data you entered.

Best regards,
Paul.

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