Off-ideal Array Tilt Output [RE-wrenches]

[Bill Brooks]

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Don and Allan,

The problem that Tim Townsend was having with PV Design Pro is that there is
a calculation bug in the program that overpredicts the impact of wire
losses. Essentially, if your wire losses are 2%, it will calculate them to
be 3 or 4%. This yields a more conservative production number which is
generally erring on the right side of safety. However, his point is that if
a bug is found, it should be fixed because it raises questions about the
code in general. I think most people that use the program have been happy
with it. However, if I used it (which I don't), I would feel much better if
the bug was removed.

Bill.

-----Original Message-----
From: Don Loweburg, Offline [mailto:i2p at aol.com]
Sent: Saturday, April 03, 2004 10:45 AM
To: RE-wrenches at topica.com
Subject: Re: Off-ideal Array Tilt Output [RE-wrenches]



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In a message dated 4/3/2004 10:20:44 AM Pacific Standard Time,
tony at appliedsolarenergy.com writes:
According to my calculations: (using the weather data for Albuquerque)
the annual total for tilt at 30 degrees, south is
5420 kwh (for a specific combination of panels and inverter)
and at tilt 26 degrees, azimuth 50 degrees west of south the annual total is
5002 kwh
so the relative performance is 92.3%.



I ran the simulation using PV Design Pro and got the result that the off
south orientation yields 93 % of true south yield.  So at least our software
yields similiar results, now for the real world.

In my experience the software is doing a good job for me predicting actual
vs
real output.


Tim Townsend has some issues with Design Pro and the way the program sizes
wire, but for me the real- theoretical is close enough --(a few percent
generally)

best, Don

[Non-text portions of this message have been removed]

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