Sanyo panels [RE-wrenches]

[Dean T. Newberry]

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Hi y'All
A note from the "Solar Energy Thermal Processes ", chapter 3, 40 pages 
are devoted to discussion and calculation of diffuse radiation.

cul deant

Kurt Nelson wrote:

> 
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>I also own a daystar and was surprised to see 1,200 w/m^2 during a day
>that had heavy haze or something going on.  Must be that all directions
>of the sky are radiating down at the array rather than a clear sun just
>coming from one point??  Something like that -- Kurt 
>
>-----Original Message-----
>From: Bill Brooks [mailto:billb at endecon.com] 
>Sent: Monday, June 28, 2004 6:11 PM
>To: RE-wrenches at topica.com
>Subject: RE: Sanyo panels [RE-wrenches]
>
> 
>
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>
>
>Ken and Kirk,
>
>Just so we're clear, power output numbers from an inverter are
>meaningless
>unless there is a corresponding irradiance and module temperature (or
>ambient temperature with mounting information).
>
>I would like to challenge our list to only list performance information
>when
>the corresponding irradiance or irradiation information is available as
>a
>minimum. Comparisons are okay as long as all the variables are the same
>(tilt, mounting, array size specified).
>
>I have read 1250W/m^2 for a 15 minute period at a site. That means the
>system should be putting out nearly 125% of what I would see at peak
>sun.
>2167Watts sounds great, but it may be not so good if the irradiance is
>enhanced. If you don't own a little hand-held irradiance meter like the
>Daystar meter, it is a must-own item for every installer. Without
>something
>to compare irradiance, you are shooting in the dark (sorry for the pun).
>
>Bill.
>
>-----Original Message-----
>From: Ken Hulet, Engineering Services Co.
>[mailto:Ken.Hulet at redwoodalliance.org]
>Sent: Monday, June 28, 2004 3:58 PM
>To: RE-wrenches at topica.com
>Subject: Re: Sanyo panels [RE-wrenches]
>
>How about 2167 W on 11 Sharp 175 Watt, 1925 W total with a SB2500?
>
>
>On Sunday, May 9, 2004, at 02:57  PM, Kirk Herander wrote:
>
>  
>
>>
>>Last week I commisioned my first system using the Sanyo 167 watt
>>modules. -14- total, -2- subarrays of seven into a Sunnyboy 2500USBD
>>inverter, total array wattage of 2.338 kwp. I and the homeowner were
>>pleasantly surprised to observe the SunnyBoy putting 2.42 Kw into the
>>grid
>>in the middle of a hazy sun day. No chance of reflected sunlight
>>adding to
>>output, I would think. The panels are fixed at 35 degree pitch in our
>>45
>>degree N latitude. The panels are apparently exceeding their nameplate
>>rating, even after efficiency hits inherent in connections, wire,
>>    
>>
>dc/ac
>  
>
>>conversion(inverter) , ect. Has anyone else seen a similar impressive
>>performance?
>>
>>Kirk
>>
>>
>>Vermont Solar Engineering
>>Kirk Herander
>>North American Board of Certified Energy Practitioners
>>Certified Solar PV Installer(TM)
>>Xantrex Certified Dealer Charter Member
>>NYSERDA-eligible installer
>>Vermont Solar and Wind Partner
>>
>>PO Box 697
>>Burlington, VT. 05402
>>www.vermontsolar.com
>>www.backeastsolar.com
>>800.286.1252 - 802.863.1202
>>fax 802.863.7908
>>
>>    
>>
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