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Unrealistic Production Yields
https://forum.pvsyst.com/viewtopic.php?f=25&t=807
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Author:  David347 [ Fri Aug 09, 2013 5:31 pm ]
Post subject:  Unrealistic Production Yields

Hi,
I have been getting unrealistic readings for yield lately. I cannot find any values I changed that would cause that. An example
Location: Hamilton, OH Lat. 39.4, Long 84.6, Alt 181m, Albedo 0.20 (default). Modules: Forty LG 250 watt modules 10 kW rated capacity, Grid tie, South facing, fixed tilt of 35 deg, No shading. Inverter: Fronius IG Plus V 10.0-1-240 Inverter, 240V AC, 4 strings of 10
I get specific prod of 1367 kWh/kWp/year seems unrealistic, Energy of 13.67 MWh/year. It comes close to a PvWatts derate value of 0.88

Thanks

Author:  AndrĂ© Mermoud [ Mon Aug 12, 2013 12:41 pm ]
Post subject:  Re: Unrealistic Production Yields

Nobody cannot give any explanation if you don't mention the full parameters and data.
You don't mention the GlobInc irradiation value of your meteo data.
The best tool for analysing such results is to have a look on the Loss diagram.

Author:  David347 [ Wed Aug 14, 2013 4:26 pm ]
Post subject:  Re: Unrealistic Production Yields

Thanks Andre, I could not paste the pdf trying jpegs,
Attachment:
File comment: global irridiation figures
globi.JPG
globi.JPG [ 89.94 KiB | Viewed 6088 times ]
and here
Attachment:
File comment: part 2
globi2.JPG
globi2.JPG [ 70.88 KiB | Viewed 6088 times ]
Thx

Author:  David347 [ Thu Aug 29, 2013 4:36 pm ]
Post subject:  Re: Unrealistic Production Yields

Hi Andre,
Sorry I need your input based on the info I submitted. What is off in my values that would cause
the results shown. What Properties might need changing?
David

Author:  AndrĂ© Mermoud [ Thu Sep 12, 2013 11:36 am ]
Post subject:  Re: Unrealistic Production Yields

Why are you judging that this is an unreallistic yield ?

If you don't have shading, soiling, or other losses, and no doubt about the quality of your modules, I don't see any reason.
This result is usual for this climate.

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