Different perspectives, was: Rain-X on module glass? [RE-wrenches]

[Windy Dankoff, Dankoff Solar]

<x-flowed>
Another piece of perspective -- old conventional wisdom is that array 
output drops off suddenly at a critical temperature. That's only true 
for battery charging systems (where the load voltage is relatively 
constant). However, even that is not true if the array is designed 
for excess voltage, to be dropped through a MPPT controller.

In that case, a little higher temp causes a little decrease in 
output, but not the sudden drop sometimes presumed.

The same should be true for any properly-designed grid-tie system, 
and for PV-direct water pumping systems, BTW.

So heat is merely a proportional loss factor, as far as I understand it.

Windy


>
>
>>Boy - these grid-tie guys think all that matters with PV is the peak
>>summer output...
>
>
>
>Christopher:
>
>This is an excellent point-- that different systems require 
>different mind sets.  Some of do only one type of PV or the other 
>(grid-tie vs. off grid) and some do both.  It is a miracle that the 
>grid-tie technology has come of age and is starting to see 
>acceptance.  But we should not forget that different applications 
>have different needs.
>
>William Miller

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

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

List rules & etiquette: http://www.mrsharkey.com/wrenches/etiquete.htm

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

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

TOPICA - Start your own email discussion group. FREE!
http://www.topica.com/partner/tag02/create/index2.html
--^----------------------------------------------------------------


</x-flowed>