two arrays [RE-wrenches]

[Dean T. Newberry]

<x-flowed>
Your free subscription is supported by today's sponsor:
-------------------------------------------------------------------
Sign up today for a No Annual Fee Discover® Platinum Card and get

0% Intro APR on Purchases & Balance Transfers for 8 Months, Up to 
2% Cashback Bonus® reward on your purchases & 100% fraud 
protection.
http://click.topica.com/caadlRMbz8Qcsbz9JC9a/DiscoverCard
-------------------------------------------------------------------

Hi y'All,
I think David's idea is to just put the zener across one panel, the 
zener would have to handle the current of one module, perhaps 7 to 8 
amps , in the case of these old modules perhaps much less current.
Another idea is to disconnect the string with a White Rodgers 1609-101 
remote bulb thermostat. This is a  22 Amps at 240VAC resistance contact 
rating, -30 to 90 F thermostat. Use the close on rise contact, and set 
it for the design temperature. The thermostat is $48 @ Graingers, and 
has zero current drain. I don't see the outdoor version of that anymore, 
so just mount it in a raintite jbox.

cul  deant



Darryl Thayer wrote:

>Your free subscription is supported by today's sponsor:
>-------------------------------------------------------------------
>Buy Stocks and Index Funds for just $4 No Account or 
>Investment Minimums and No Inactivity Fees Automatically 
>invest weekly or monthly and build your future.
>http://click.topica.com/caadlVFbz8QcsbdulIia/Sharebuilder
>-------------------------------------------------------------------
>
>I think the zener idea might require some high power
>Zeners.  If I put a zener diode across a 3KW array and
>it only had to absorb 10% of the power, that is still
>300 watts.  This is doable using a high power
>transistor and Zener but maybe not practical.  
>
>At one time Bob Gudgel of Outback was working on a
>clipper circuit that chopped the power to reduce the
>voltage.  I think that it may have fallen into the
>category of good idea not enough time, or use.  
>Darryl
>
>--- Warren Lauzon <windsun at wind-sun.com> wrote:
>  
>
>>Or you could maybe just put Zener diodes across the
>>panels or a set of 
>>panels.
>>Northern Arizona Wind & Sun, Inc.
>>    
>>
>
>  
>
>>----- Original Message ----- 
>>From: "David Katz" <david at aeesolar.com>
>>Hi Jeff,
>>I have ad an idea for a long time about a device
>>that shorts one module
>>in a series at a preset low temperature. It would
>>act like a bypass
>>diode on a shaded module controlled by a thermistor
>>so at a preset
>>temperature the array would drop in voltage. This
>>would probably not
>>cause much loss of power because as soon as the sun
>>hit the array
>>directly, it would warm up and drop in voltage.
>>I will work on the idea.
>>    
>>
>
>  
>
>>David Katz
>>    
>>
>
>
>__________________________________________________
>Do You Yahoo!?
>Tired of spam?  Yahoo! Mail has the best spam protection around 
>http://mail.yahoo.com 
>
>==========================================================
>Extra! Extra! Read all about it! Get the latest weather,
>sports, and lifestyle news you can't afford to miss, all
>at a price you can afford to pay!  Click now!
>http://click.topica.com/caaa9eYbz8QcsbdulIif/TopOffers
>==========================================================
>- - - -
>To send a message: RE-wrenches at topica.com
>
>Archive of previous messages: http://lists.topica.com/lists/RE-wrenches/read
>
>List rules & etiquette: www.mrsharkey.com/wrenches/etiquette.php
>
>Check out participant bios: www.mrsharkey.com/wrenches/
>
>Hosted by Home Power magazine
>
>Moderator: michael.welch at homepower.com
>
>
>  
>


-- 
Dean T. Newberry

http://www.TalbottSolar.com
Email:  deant at dcn.org

Cell:      530 867-2392
Fax:      530-758-8187

Your free subscription is supported by today's sponsor:
-------------------------------------------------------------------
Buy Stocks and Index Funds for just $4 No Account or 
Investment Minimums and No Inactivity Fees Automatically 
invest weekly or monthly and build your future.
http://click.topica.com/caadlVFbz8Qcsbz9JC9f/Sharebuilder
-------------------------------------------------------------------

- - - -
To send a message: RE-wrenches at topica.com

Archive of previous messages: http://lists.topica.com/lists/RE-wrenches/read

List rules & etiquette: www.mrsharkey.com/wrenches/etiquette.php

Check out participant bios: www.mrsharkey.com/wrenches/

Hosted by Home Power magazine

Moderator: michael.welch at homepower.com
--^----------------------------------------------------------------
This email was sent to: michael.welch at homepower.com

EASY UNSUBSCRIBE click here: http://topica.com/u/?bz8Qcs.bz9JC9.bWljaGFl
Or send an email to: RE-wrenches-unsubscribe at topica.com

For Topica's complete suite of email marketing solutions visit:
http://www.topica.com/?p=TEXFOOTER
--^----------------------------------------------------------------




</x-flowed>