performance degradation [RE-wrenches]

[Ray Walters]

<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/caadtrVbz8Qcsbz9JC9a/DiscoverCard
-------------------------------------------------------------------


>  Operating voltage range is far more important.
>
>AMEN to what Brother Bill said!!!!!
>
>I call the low-end of the input window "the toilet". . . .  For a reason.  I
>recommend staying out of the toilet.
>
>Matt Lafferty
>

I second that. With an MPPT system in1988 (Grundfos Pumping System) We had 
hell with the narrow voltage window. It practically ruined the project, as 
cell temperatures were so high in Africa, that Voc dropped below the 
threshold of systems that were designed as high as Voc in cool weather 
would allow. I ended up rewiring modules (Solarex MSX60s) 7&1/2 in series 
(they could be wired in6 or 12 volt) The villagers went out every 30 
minutes and sprayed the modules with water to cool them down enough to 
operate the pump. With cell degradation, I bet those pumps don't work at 
all now.


Ray Walters
ray at solarray.com
President, SolarRay, Inc.
NABCEP Certified Solar PV Installer
BS Mechanical Engineering, UT Austin 88
Returned US Peace Corps Volunteer 

Your free subscription is supported by today's sponsor:
-------------------------------------------------------------------
Get a Free T-Mobile Sidekick II plus $500 towards service! 
Click here.
http://click.topica.com/caaduFNbz8Qcsbz9JC9f/ProductTestPanel
-------------------------------------------------------------------

- - - -
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>