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Olaf,<br>
I have used multiple instances of Type94 to compute the output of
differently oriented PV arrays a number of times and have gotten
good results so I suspect that there may be a problem in the way the
model has been defined. One complexity of Type94 is that it has two
power outputs; one that gives the power at the maximum power point
(and therefore assumes that the array is equipped with a maximum
power point tracking (MPPT) device) and another that gives the array
power at a particular load voltage. This second output is used for
direct-connected systems that do not have an MPPT and in this case,
the load voltage is an input to the model. Make sure that you are
looking at the maximum power point power when you compare the output
of the three arrays; otherwise, the problem may be that the load
voltage on the array is so low that the power output of the array is
minimal no matter what its orientation. If you are unable to find
the solution then I would recommend that you send your project to
your distributor for further assistance.<br>
Best,<br>
David<br>
<br>
<br>
<div class="moz-cite-prefix">On 1/8/2013 03:12, Olaf Scholz wrote:<br>
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<p class="MsoNormal"><span lang="EN-US">I created a PV collector
field consisting of three fields (type 94a) for 3 incident
directions (east, south, west) all 94a- modules are
connected tot o a type109 weather generator. The total
incident radiation for the three directions seems to be
calculated correctly (output of type109 for three different
surfaces). But the power output of the PV modules seems to
be always the same, which is not correct. Do you have a
solution for that ?<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US">It seems to be the used
input variable in type 94a is always the same, so that only
the last value is used for the calculation.<o:p></o:p></span></p>
<p class="MsoNormal"><span lang="EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span
style="font-size:12.0pt;mso-fareast-language:DE">Olaf</span></b><span
style="mso-fareast-language:DE"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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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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