DC to AC Conversions Calcs.... [RE-wrenches]

[Kirpal Khalsa]

Thanks all for your input on DC to AC calcs......gives me a wide range
of ideas to try to help formulate some background in my reasoning with
Oregon officials to consider giving us definitions on their
limits.....right now it is guesswork...........
I know industry wide the Califonia PTC calcs are most commonly
used.........and are clearly defined.....In Oregon we are lacking the
clear definition.......
the sun is shining, the weather is sweet, makes me want to go install some pv!
Cheers,

-- 
Sunny Regards,
Kirpal Khalsa
NABCEP Certified Solar PV Installer TM
Renewable Energy Systems

On Thu, Jun 12, 2008 at 9:08 AM, Jeff Clearwater, Village Power Design
<jeffc at villagepower.com> wrote:
>
> Hi Kirpal,
>
> I use PTC (AC) (PTC DC x CEC weighted inverter efficiency) as a standard in
> my contracts (in the language about any possible disputes on system
> performance).
>
> I don't know the OR regs or if they have provided a standard calculation,
> but If you want to maximize the DC vs AC and keep AC below 25 KW then you
> might be able to use:
>
> PTC (AC) x all the loss factors listed in the PVWATTs derate calculation
> screen including of course shading
>
> or the Max AC of the inverter if it is less than that.
>
> Hope that helps!
>
> Jeff Clearwater
>
>
>> Hi All......In Oregon the license for non electrician solar installers
>> is a LRT license.......This license is valid when working on a
>> permitted system up to 25kW AC.......What calculations might you all
>> use when determining the AC size of the system.........besides the
>> obvious.....Inverter efficiency losses de-rating and wiring losses
>> de-rating?   I am trying to determine what the maximum size in terms
>> of a DC system would be able to be installed and not exceed the 25kW
>> AC system cap.....How might you all interpret that?
>> Thanks.....
>>
>> --
>> Sunny Regards,
>> Kirpal Khalsa
>> NABCEP Certified Solar PV Installer TM
>> Renewable Energy Systems
>
>
> --
> ~~~~~~~~~~~~~
> Jeff Clearwater
> Village Power Design
> Sustainable Energy & Water Solutions for Home & Village
> http://www.villagepower.com
> gosolar at villagepower.com
> NABCEP (tm) Certified Solar PV Installer
>
> Voice: 413-259-3776
> Fax: 413-825-0703
> 65 Schoolhouse Rd
> Amherst, MA 01002
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~`~
>
>
> - - - -
> Hosted by Home Power magazine
>
> To send a message: RE-wrenches at topica.com
>
> Archive of previous messages: http://lists.topica.com/lists/RE-wrenches/read
>
> List rules & how to change your email address:
> www.mrsharkey.com/wrenches/etiquette.php
>
> Check out participant bios: www.mrsharkey.com/wrenches/
>
> Moderator: michael.welch at homepower.com
>
>


- - - -
Hosted by Home Power magazine

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

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

List rules & how to change your email address: www.mrsharkey.com/wrenches/etiquette.php

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

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

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
--^----------------------------------------------------------------