Off-ideal Array Tilt Output [RE-wrenches]

[William Korthof]

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Interesting subject to bring up...

If your wire losses at peak power are 2%, your actual wire
losses will be significantly lower. At half power, the losses
would be half as much (1%). At 25% power, losses would
be one quarter (0.5%). The overall losses are the production-
weighted wire loses over the total production cycle. I think
the overall wire losses for a typical system would be maybe
50-60% of the loss at peak power.

/wk


At 08:28 PM 4/4/2004, Bill Brooks wrote:

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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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