25 kW inverter [RE-wrenches]

[Paul Israel]

Wrenches,  

1.  Most Utility Interconnection Applications use the inverter nameplate to
determine system size for interconnection. 

2.  The NEC uses it to size the OCPD.

3.  The manufacturers vary as to which inverter can handle power above the
nameplate rating.  Some will process the extra power others will not.
However, by the time we follow the manufacturers or figure for ourselves how
much wattage the inverter can efficiently process we are probably darn close
to the rated nameplate.  Time, that stringent beast, will limit it anyway.

4.  Oversizing an inverter for future expansion would limit us to installing
a 25kW inverter.  Installing a 50kW inverter and then putting 25kW of panels
would be questionable at best.  A loophole that would be quickly closed.

Hey, let's just change the law!

 

 
Paul N. Israel, President
paul at sunlightsolar.com
www.sunlightsolar.com
541/389-3480 (Oregon)
203/878-9123 x103 (CT)
860/617-6527 (Cell)
-----Original Message-----
From: Jeff Oldham [mailto:starpower4u at juno.com] 
Sent: Thursday, June 12, 2008 12:48 PM
To: RE-wrenches at topica.com
Subject: Re: 25 kW inverter [RE-wrenches]



For sure don't use Inverter nameplate as pointed out, however it will see to
it that you do not exceed the AC by much. I say "much" as most of us have
seen an inverter exceed nameplate more then a few times for short periods.
At the same time I can't see any engineering review assume it will exceed
nameplate. I'm not sure if the CSI calculator will accept out of State Zips
or not. If it does you will error on the safe side as the calc is a bit
optimistic by 5-15% depending on site conditions and equipment. Another
approach is to use the online inverter manufacturers calculators and plug in
your temperature ranges. Here it tends to be a bit conservative depending on
the manu. If you add 10% to their output numbers you should be safe.
Finally pick a hazy day for your inspection (just kidding!).
Good luck,
-jeff


>From the Solar, Wind and Hydro powered office of Jeff Oldham/Regenerative
SOLutions
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