[RE-wrenches] Wiley Asset

Thu Sep 9 09:55:18 PDT 2010

Hi Kent:
    I am sure that aerial wires have very little impact on system outputs.  I 
just checked the Enphase Enlighten data for a system I recently installed, which 
had a 1-2" to 3/4" wire bundle running just 5' above a solar modules.  The wire 
cast a distinct shadow on the module in question, but upon reviewing the output 
of that module, compared with all other modules at the same orientation, I have 
found that there is absolutely no effect on the production.  I am surprised that 
I can not even see any difference.  That module has always produced within 99% 
of the other modules on that roof, and the total output of that module is as 
high or higher than the other modules!
Nick Soleil
Project Manager
Advanced Alternative Energy Solutions, LLC
PO Box 657
Petaluma, CA 94953
Cell:   707-321-2937
Office: 707-789-9537
Fax:    707-769-9037

________________________________
From: Kent Osterberg <kent at coveoregon.com>
To: RE-wrenches <re-wrenches at lists.re-wrenches.org>
Sent: Thu, September 9, 2010 9:38:55 AM
Subject: Re: [RE-wrenches] Wiley Asset

  Benn,

At 25 ft a 1-inch power line subtends an angle of 0.2 degree.  The sun subtends 
an angle of  0.5 degree, so the power line will not make a dark shadow on the 
modules - only 50% of the light can be blocked.  Depending on the distance from 
the module to the wire, along the ray to the sun, the wire will probably block a 
little less light.  But a 50% reduction in the light on a few cells will 
probably reduce the entire module output by 50%.  A shadow every day for the 
hours you are talking about sounds like a pretty serious issue.

Kent Osterberg
Blue Mountain Solar

benn kilburn wrote: 
Thanks for the feed back guys, much appreciated!   
>
>
>Now, how would you calculate for power/phone lines running thru the Pathfinder's 
>reflection.  There are about 6 of them (the largest being at least 1") at least 
>25-30 ft away directly east of the proposed array location, and they are running 
>straight north-south.  On the Pathfinder they run btwn 9 and 11am in June and 
>btwn 10:30 and 11:30 in December.  
>
>
>Would the pathfinder software, suneye or asset pick up on utility lines at that 
>distance?  How much effect do they have on available sun output? And while i'm 
>at it, how much do the 'software' tools pick up on the tips of leafless tree 
>branches at say 25ft, 50ft?
>
>
>i'll try out that spreadsheet idea, nice one!
>
>
>cheers,
>benn
>
>DayStar Renewable Energy Inc.  
>benn at daystarsolar.ca
>780-906-7807 
>HAVE A SUNNY DAY 
>
>
>
>________________________________
Date: Wed, 8 Sep 2010 20:05:08 -0700
>To: re-wrenches at lists.re-wrenches.org
>From: william at millersolar.com
>Subject: Re: [RE-wrenches] Wiley Asset
>
>Benn:
>
>A colleague has used the Wiley took and calls it 'marginal.'
>
>I use the Pathfinder and I like the features Ray described.  I wrote a very 
>simple spreadsheet using the teeny numbers on the month lines to create 100% of 
>any month.  I highlight and delete any of the numbers that are shaded and the 
>remainder is the percent of exposure for a given month.  You can multiply the 
>output of PV watts or any other production result for a complete production 
>prediction.  Easy and free.
>
>William Miller
>
>
>At 05:38 PM 9/8/2010, you wrote:
>
>I've used the Pathfinder for decades, so I'm partial to them. Great for on-site 
>discussions of shading issues with the customer, as multiple people can see the 
>shading at the same time on the spot.
>>I've also used their Assistant software, and it works pretty well. You take a 
>>photo of the actual pathfinder from above, and then download the photo into 
>>their software.
>>You can then calculate total annual impact of any shading in Kwh, or percentage 
>>of annual production.
>>I've been quite happy with the system, and the price for a Pathfinder, and the 
>>software is much less than the Suneye, I believe.
>>
>>R. Walters
>>ray at solarray.com
>>Solar Engineer
>>
>>
>>
>>
>>On Sep 8, 2010, at 3:46 PM, benn kilburn wrote:
>>
>>
>>Wrenches,
>>>
>>>I'm looking at trying out another 'solar site evaluation tool', the ASSET (Acme 
>>>Solar Site Evaluation Tool) from Wiley Electronics.  I'm looking for feedback on 
>>>its performance and user-ability.
>>>I have been using the pathfinder which is great, but not the pathfinder 
>>>software.
>>>
>>>Any comments on the ASSET or Pathfinder software would be greatly 
appreciated.
>>>
>>>Cheers,
>>>benn
>>>
>>>DayStar Renewable Energy Inc. 
>>>benn at daystarsolar.ca
>>>780-906-7807 
>>>HAVE A SUNNY DAY
>>>
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