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<p>Ashley,</p>
<p> I am not too surprised by the 100W output with 1000W incident;
PV panels are not very efficient and depending on ambient
conditions such as temperature and windspeed a 10% efficiency is
not unreasonable. It is a little more troubling that increasing
the array area does not have an impact on the output power. If you
are using Trnsys17 then please send the project as well as any
other files needed in order to run the project to your
distributor's tech support hotline. If you're not sure who to
contact then please send me an email containing the information in
your user17.id file (it can be opened with a text editor) and I
can put you in contact with the appropriate person. NOTE: please
do not reply to the entire mailing list with the information
above. Please send an email directly to me. <br>
</p>
<p><br>
</p>
<p> As to your question about parameter 20; I_L is called the light
current and is one of the five parameters used to describe the
behavior of an equivalent circuit that is used to model PV
behavior. Be very careful in modifying those parameters; they are
all highly interlinked with one another and cannot realistically
be changed independently of one another. For additional
information on the variable and on the model I would recommend you
look at the Type194 section of the 04-MathematicalReference
manual.</p>
<p>kind regards,</p>
<p> David</p>
<p><br>
</p>
<br>
<div class="moz-cite-prefix">On 07/20/2016 09:35, Easterling, Ashley
J via TRNSYS-users wrote:<br>
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<p>I am modeling a solar array using Type 194. The weather file
(Type 109-TMY2) is supplying an appropriate amount of incident
radiation (~1000 W/m^2 in the summer in Richmond VA). However,
when I connect to Type 194, the solar panel outputs a maximum
of ~100 W/m^2. I have 2 questions:</p>
<p><br>
</p>
<p>1) Increasing the array area is not increasing the output.
Can anyone explain why that might be?</p>
<p>2) What is parameter 20 (value of parameter I_L at reference
conditions)? Increasing it increases output.</p>
<p><br>
</p>
<p>Any help would be appreciated.</p>
<p><br>
</p>
<p>Ashley<br>
</p>
</div>
<br>
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<pre class="moz-signature" cols="72">--
***************************
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
<a class="moz-txt-link-abbreviated" href="mailto:d.bradley@tess-inc.com">d.bradley@tess-inc.com</a>
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