Date: Wed, 8 Apr 2009 16:03:40 -0700
Reply-To: Rocket J Squirrel <camping.elliott@GMAIL.COM>
Sender: Vanagon Mailing List <vanagon@gerry.vanagon.com>
From: Rocket J Squirrel <camping.elliott@GMAIL.COM>
Subject: Re: Solar Panel Fitment
In-Reply-To: <E006B104-AE9E-42A6-A099-207D76AADBD9@GMAIL.COM>
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Word.
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Mike "Rocket J Squirrel" Elliott
84 Westfalia: Mellow Yellow ("The Electrical Banana")
74 Utility Trailer. Ladybug Trailer, Inc., San Juan Capistrano
Bend, OR
KG6RCR
On 4/8/2009 3:43 PM Keith Ovregaard wrote:
> Yes, it is true that a bit of shade on the panel drops the output
> dramaticly, but in some situations, full sun is available for a limited
> amount of time due to trees, canyon walls, etc. and a higher output
> panel can help make up for the diminished exposure time.
>
>
> On Apr 8, 2009, at 1:22 PM, Rocket J Squirrel wrote:
>
>> On 4/8/2009 11:53 AM Keith Ovregaard wrote:
>>
>>> Some volks like the simple approach and permanently mount the panel to
>>> the roof. Using a larger higher output panel will help compensate for
>>> off-angle alignment to the sun and shady campsites.
>>
>> True that off-angle output doesn't drop panel output super fast like
>> shade does. But one could put a thousand watt panel up there and the
>> shade from a few branches would drop the output to 5W or less. BTDT.
>>
>> Hook an ammeter in series with the panel and shade a portion of the
>> panel with your hand. The output will go down faster than Lehman
>> Brothers.
>>
>> "Orientation of the modules to the sun is critical to the successful
>> operation of a PV system. Ideally, the modules will be at a 90° angle
>> to the sun's rays at all times. In practice, this is not always
>> practical. Tracking mounts are available which will automatically
>> reposition the modules continuously throughout the day, although they
>> are quite expensive, and installed only on large arrays. Most systems
>> are installed on a fixed-azimuth mount, which is adjustable seasonally
>> for elevation. This means that the modules are pointed due south
>> (Northern Hemisphere) or north (Southern Hemisphere), and the angle to
>> the horizon adjusted several times a year as needed to keep the
>> modules best aligned with the sun's rays. The result is slightly lower
>> output power during the morning and evening, but results also in a
>> much lower installed price. Even small areas of shade on a module will
>> decrease the output dramatically, so location is an important
>> consideration during installation."
>>
>> http://www.mrsharkey.com/busbarn/electrics/chapt1.htm
>>
>> --
>> Mike "Rocket J Squirrel" Elliott
>> 84 Westfalia: Mellow Yellow ("The Electrical Banana")
>> 74 Utility Trailer. Ladybug Trailer, Inc., San Juan Capistrano
>> Bend, OR
>> KG6RCR
>>
>>
>
>
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