[TRNSYS-users] Questions for TYPE 94 (PHOTOVOLTAIC ARRAY)

Diego A. Arias daarias at wisc.edu
Wed Jan 25 08:32:55 PST 2006

Dear Tony,

TNT Lam wrote:

> Hello,
> I am a fresh user of TRNSYS and I am going to model the TYPE 94
> photovoltaic system.
> The sloped PV array is connected to a battery, so as to observe the
> power generation. However, I got some questions.
> 1. For INPUT No.6 & 7 (Beam radiation and Diffuse radiation), ! are
> the values required to be normal to the sloped PV surface?

Yes, these are the beam an diffuse radiation normal to the surface.

> 2. Particularly INPUT No.7 (Diffuse radiation), does the value include
> ground-reflected radiation? Or, is ground-reflected radiation not
> included in INPUT No.7?

This term should include all terms for diffuse radiation. Type94 does
not know how you calculated this value.

> 3. For INPUT No.1 (Total incident radiation), is the value equal to
> the sum of INPUT No.6 & 7?

In theory, yes. However, when you are using weather data files, you may
find that during sunset or sunrise, as the radiation is so small, the
precision of the instruments may result in values that do not add up as
the theory.

Best regards,


> I am looking forward to r! eceiving reply.
> Thanks a lot.
> Regards,
> Tony NT Lam
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Diego A. Arias
TRNSYS Coordinator
Solar Energy Laboratory
University of Wisconsin - Madison
1500 Engineering Drive
Madison, WI 53706

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