Learning about Direct Coupling [RE-wrenches]
Jeff Clearwater
clrwater at earthlink.net
Tue Apr 15 12:39:51 PDT 2003
<x-flowed>
Hi All,
I can imagine a cap/small battery buffer that would deal with this
but then you'ld also have to have a way to supply grid AC when
needed. Like Jeff says it sounds like the hassle wouldn't be worth
the expense but do you know otherwise? Is this a seriously emerging
industry?
jc
>"Direct Coupling of PV to lighting loads in commercial buildings. Has
>anybody had any experience with this? Anybody want to learn with me?"
>
>All fluorescent and HID commercial lighting fixtures require ballasts
>which are an AC device. Of course you could use custom DC ballasts
>but that is not your main problem. I think you will find the direct
>coupling of the pv array to the lighting loads without any kind of
>electrical "buffer" device to stabilize system voltage such as a
>battery bank, voltage regulator, or inverter, the voltage and currents
>will be all over the place and either destroy your ballasts or at
>least cause constantly changing light output levels. What happens if
>a cloud passes over?
>
>You will also find it very expensive for retro-fit DC electronic
>ballasts in this size range. Bottom line, probably cheaper to use
>grid tied inverter system and lower cost (but high efficiency) AC
>ballasts.
>
>Jeff Yago
>
>- - - -
>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
>
--
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Jeff Clearwater
Village Power Design Associates
Sustainable Energy & Water Solutions for Home & Village
Office: (413) 256-6777, Cell: (720)480-8455
Fax: (413) 825-0372
61 Baker Road
Shutesbury, MA 01072;
PO Box 764
Boonville, CA 95415
(707) 895-9015
Council Member - Ecovillage Network of the Americas - http://www.ecovillage.org
Advisory Board - Living Routes - Ecovillage Education -
http://www.livingroutes.org
Founder: Ecovillage Research, Development, and Demonstration Program:
http://www.home.earthlink.net/~clrwater/RDD/rdd.html
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
- - - -
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 sbcglobal.net
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>
More information about the RE-wrenches
mailing list