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Jordn

Pitch and orientation

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Hi everyone & Valentin,

we're creating an orientation and pitch chart to show others clearly the kind of performances to expect. Like a compass - difference in Orientation axis follows around the chart, and difference in pitch runs from the centre to the circumference in smaller to larger circles (0 degrees to 80 degrees pitch). So the first circle from the centre represents 10 degrees pitch, the second circle from the centre represents 20 degrees pitch and so on. It's quite smart and will hopefully give clarity to others than Northern facing systems still produce an acceptable level of generation. This is what we've made so far as an example;

2058553254_solarlossesPVSol3.png.a3c34a354507768974ed068861760807.png

 

...All we've done above is estimated what we think the chart would look like.

We'd like to make a PV Sol experiment on what the chart would actually look like. So to do this I'm noting down the PV Sol PV Generator Energy (AC Grid) value for every different combination of orientation and pitch. I've made one for Newquay UK using 14 SunPower Maxeon2 350 panels and a solis 3.68kw inverter (no shading). Just as an illustration;

Screenshot_Screenshot04.thumb.jpg.402b103b6e32a5bf32d1e84b996791d5.jpg

 

Just using my simple head I would have initially thought East and West orientations would mirror eachother down the South line, as in East and West would give equal or similar energy - lets say 20° due West would provide the same amount of energy as 20° due East.

But then this is Newquay, there's the ocean to the West which would skew the results to favour the West though a big water body Albedo.

newquay.thumb.png.b3f51495d659b885f21098ece619d1ba.png

 

So then I tried other locations; Baldhu UK, Norfolk UK, Riyadh SA and PV Sol shows West orientations generate more PV Generator Energy (AC Grid) than East orientations.

Couple of questions please;

  • is there a location in the world where East and West orientations match PV Generator Energy (AC Grid)?
  •  am I missing something here... generally speaking is it normal for West orientations to generate more than East?

 

Thank you everyone!!
 

Yours,

 

Jordan

 

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Hi Jordn,

this is a very interesting project you are working on there! Thank you for sharing this.

In general, the climate data used to simulate the PV system have the strongest influence on the symmetry of the results. Other influences can come from the models used to calculate the irradiance on the tilted plane and so forth, the synchronity of the sun's coordinates with the climate data and the like.

I just checked this for some locations and climate data sources, and compared the orientations 90° (East) and 270° (West) with 180° (South), all at 30° inclination.

  • Berlin with data from DWD: East brings 82,4 %, West 80,6 %
  • Berlin with TMY data, also DWD, but different source: East brings 82,7 %, West 77,7 %
  • Severn England, SAP 2012 dataset: East brings 82,6 %, West 81,9 %
  • Newquay UK, interpolated in PV*SOL with Meteonorm 7.2: East brings 82,6 %, West 81,4 %

So, in contrast to your results, we have a higher irradiation on the East facing systems. This seems strange to me, could you provide a project file, perhaps? You can also send it via private message. Which version of PV*SOL are you using?

Kind regards,

Martin

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I checked out the Severn England SAP 2012 dataset and these are the results;

14 x SunPower Maxeon2 350 + Solis 3.68kW (no external shading)

 

    Orientation from South (Clockwise)    
    90 105 120 135 150 165 180 195 210 225 240 255 270    
Pitch 60 3861 3489 3105 2742 2423 2175 2070 2116 2317 2599 2919 3260 3599 60 Pitch
50 4090 3732 3357 2999 2691 2497 2417 2443 2593 2862 3176 3508 3836 50
40 4286 3961 3622 3301 3053 2902 2833 2849 2955 3165 3488 3748 4047 40
30 4445 4176 3903 3648 3455 3334 3278 3287 3363 3516 3737 3984 4236 30
20 4568 4376 4186 4013 3870 3777 3734 3739 3794 3899 4047 4219 4401 20
10 4640 4541 4446 4359 4288 4237 4210 4211 4239 4290 4361 4448 4544 10
0 4640 4640 4640 4640 4640 4640 4640 4640 4640 4640 4640 4640 4640 0
10 4640 4735 4819 4887 4935 4959 4957 4932 4884 4817 4734 4641 4544 10
20 4568 4747 4906 5034 5123 5167 5166 5120 5033 4909 4756 4584 4401 20
30 4445 4694 4913 5091 5213 5272 5272 5211 5093 4924 4718 4483 4236 30
40 4286 4585 4847 5060 5207 5279 5277 5206 5067 4865 4618 4341 4047 40
50 4090 4420 4712 4946 5106 5191 5186 5101 4954 4733 4458 4156 3836 50
60 3861 4208 4505 4751 4921 4999 4996 4916 4754 4526 4245 3926 3599 60
    90 75 60 45 30 15 0 345 330 315 300 285 270    
    Orientation from South (Clockwise)    

 

And then turned them into %'s using the largest value as 100%.

 

    Orientation from South Clockwise    
    90 105 120 135 150 165 180 195 210 225 240 255 270    
Pitch 60 73 66 59 52 46 41 39 40 44 49 55 62 68 60 Pitch
50 77 71 64 57 51 47 46 46 49 54 60 66 73 50
40 81 75 69 63 58 55 54 54 56 60 66 71 77 40
30 84 79 74 69 65 63 62 62 64 67 71 75 80 30
20 87 83 79 76 73 72 71 71 72 74 77 80 83 20
10 88 86 84 83 81 80 80 80 80 81 83 84 86 10
0 88 88 88 88 88 88 88 88 88 88 88 88 88 0
10 88 90 91 93 93 94 94 93 93 91 90 88 86 10
20 87 90 93 95 97 98 98 97 95 93 90 87 83 20
30 84 89 93 96 99 100 100 99 96 93 89 85 80 30
40 81 87 92 96 99 100 100 99 96 92 87 82 77 40
50 77 84 89 94 97 98 98 97 94 90 84 79 73 50
60 73 80 85 90 93 95 95 93 90 86 80 74 68 60
    90 75 60 45 30 15 0 345 330 315 300 285 270    
    Orientation from South Clockwise    

 

And then rounding each value into a range;

 

    Orientation from South Clockwise    
    90 105 120 135 150 165 180 195 210 225 240 255 270    
Pitch 60 75 70 60 55 50 40 40 40 40 50 60 65 70 60 Pitch
50 80 75 65 60 55 50 50 50 50 55 65 70 75 50
40 85 80 70 65 60 60 55 55 60 65 70 75 80 40
30 85 80 75 70 70 65 65 65 65 70 75 80 85 30
20 90 85 80 80 75 75 75 75 75 75 80 85 85 20
10 90 90 85 85 85 85 85 85 85 85 85 85 90 10
0 90 90 90 90 90 90 90 90 90 90 90 90 90 0
10 90 95 95 95 95 95 95 95 95 95 95 90 90 10
20 90 95 95 95 95 100 100 95 95 95 95 90 85 20
30 85 90 95 95 100 100 100 100 95 95 90 90 85 30
40 85 90 95 95 100 100 100 100 95 95 90 85 80 40
50 80 85 90 95 95 100 100 95 95 95 85 80 75 50
60 75 85 90 95 95 95 95 95 95 90 85 75 70 60
    90 75 60 45 30 15 0 345 330 315 300 285 270    
    Orientation from South Clockwise    

 

And then quickly transferring (inc. handling the results to make symmetrical for illustration purposes) the results to the previous chart (using Microsoft paint);

463288219_PVSOLpitchandorientationlossestestcorrect.png.c3add04610a4d0621e002d2231e6fdba.png

 

Yes so it looks much better using the Severn dataset, thank you. (Unlike my inception of that chart ahha).

 

Quick question if anyone is up for it please; speaking to my colleagues we suggest Eastern orientations should generate more kWh than West generation because the panels experience less heat losses as they're cooler in the morning. What else would suggest a difference in generation between the East and West orientations? I'm guessing this is a solar designer elementary question. Thank you!

 

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