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

[Jeff Clearwater, Village Power Design]

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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
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