[TRNSYS-users] Problem withType 194b PV panel efficiency

[David BRADLEY]

Santeri,
   I would recommend that you run the plugin for Type194 (click on the 
magic wand icon in the lower left corner of the parameters tab of the 
proforma). The plugin will take the parameters that you can get from the 
PV panel manufacturer and will give you back the various values that the 
Type requires. I would not recommend changing those parameters (a, IL, 
IO, series resistance, etc.) arbitrarily.

   I would also recommend that you run the PV without the inverter in 
order to make sure there isn't a mismatch between the two.
Kind regards,
  David



On 9/4/2012 09:48, Santeri Siren wrote:
> Dear Trnsys users,
>
> I am simulating a PV system in Finlands conditions using component 
> 194b. My problem is that system efficiencies are pretty low (7...8% at 
> summer time). By efficiency I mean produced power at maximum power 
> point divided by the total radiation of the sun [W/m2/W/m2].
>
> I can affect the efficiency by growing parameter number 20 (IL). If I 
> grow this parameter, my efficiency also grows.  I checked the 
> matematical reference, and it says that IL = photocurrent. However I 
> have no Idea what kind of values should I give to this parameter. Does 
> anyone know that should I chande the default value of this parameter 
> to something else?
>
>
> Here are the products I used for parameters:
>
> PV panels: 
> http://am.suntech-power.com/images/stories/pdf/datasheets/jun2012/STP240_Wde_Poly_35mmFrame.pdf 
> <https://mail.aalto.fi/owa/redir.aspx?C=8LHY1PC5HU2JpAvOUvOogdFHYkwoXs8ImeeuOqFfiahYYb-xE77mmUM_w1LaswdMN3VtECxKbS8.&URL=http%3a%2f%2fam.suntech-power.com%2fimages%2fstories%2fpdf%2fdatasheets%2fjun2012%2fSTP240_Wde_Poly_35mmFrame.pdf>
>
> Inverter (sunnyboy 5000TL): 
> http://www.sma-uk.com/en_UK/products/solar-inverters/sunny-boy/sunny-boy-3000tl-3600tl-4000tl-5000tl.html 
> <https://mail.aalto.fi/owa/redir.aspx?C=8LHY1PC5HU2JpAvOUvOogdFHYkwoXs8ImeeuOqFfiahYYb-xE77mmUM_w1LaswdMN3VtECxKbS8.&URL=http%3a%2f%2fwww.sma-uk.com%2fen_UK%2fproducts%2fsolar-inverters%2fsunny-boy%2fsunny-boy-3000tl-3600tl-4000tl-5000tl.html>
>
>
> Best regards,
>
> Santeri Siren
>
>
> _______________________________________________
> TRNSYS-users mailing list
> TRNSYS-users at cae.wisc.edu
> https://mailman.cae.wisc.edu/listinfo/trnsys-users

-- 
***************************
David BRADLEY
Principal
Thermal Energy Systems Specialists, LLC
22 North Carroll Street - suite 370
Madison, WI  53703 USA

P:+1.608.274.2577
F:+1.608.278.1475
d.bradley at tess-inc.com

http://www.tess-inc.com
http://www.trnsys.com

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