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 <[email protected]>
To: RE-wrenches <[email protected]>
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.
>[email protected]
>780-906-7807
>HAVE A SUNNY DAY
>
>
>
>________________________________
Date: Wed, 8 Sep 2010 20:05:08 -0700
>To: [email protected]
>From: [email protected]
>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
>>[email protected]
>>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.
>>>[email protected]
>>>780-906-7807
>>>HAVE A SUNNY DAY
>>>
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