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

[August Goers]

Hi Kirpal -

Here in California we use the CSI EPBB Calculator which calculates the AC size. Go to http://www.csi-epbb.com/ . The users guide in the upper right hand corner will help explain how it works.

In a nutshell, you can enter your module and inverter information and it will spit out an AC system size. The AC size is the product of the PTC (CEC) module rating, the CEC inverter efficiency, and the module count. Wire losses do not come into play. 

I wouldn't simply use the inverter size to calculate the AC system size. We often purposely oversize our inverters to either allow for future expansion or to help reduce the load a bit on the inverter. In otherwords, you could have a 3 kW AC system with a 4 kW inverter.

-August

 August Goers


Luminalt Energy Corporation






----- Original Message ----
From: Kirpal Khalsa <solarworks at gmail.com>
To: RE-wrenches at topica.com
Sent: Wednesday, June 11, 2008 8:30:01 PM
Subject: DC to AC Conversions Calcs.... [RE-wrenches]

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


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