calculation (point of attachment)[RE-wrenches]

[William Miller]

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Keith:

As am I.  However, you did indicate that the service upgrade was 
"challenging" and I thought I'd suggest an option to doing it your self.

William Miller


>William
>
>I am a licensed electrician....
>
>Keith Cronin
>President
>Island Energy Solutions Inc.
>270 Kuulei Rd. Suite 106
>Kailua, HI 96734
>808-262-3268 Tel
>808-263-0338 Fax
>keith at islandenergy.net
>www.islandenergy.net
>
>
>
>-----Original Message-----
>From: William Miller [mailto:wrmiller at charter.net]
>Sent: Wednesday, January 18, 2006 12:24 PM
>To: RE-wrenches at topica.com
>Cc: Keith Cronin
>Subject: Re: calculation (point of attachment)[RE-wrenches]
>
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>
>Keith:
>
>If the loads require a service upgrade without PV, the addition of PV does
>not change that.  Furthermore, a battery based inverter system creates
>additional load (battery charging).  Hopefully the engineer figured on the
>battery charging load as well.
>
>If you feel daunted by the service upgrade, subcontract a licensed
>electrician.  Every one has their own expertise and the job goes better
>when everyone stays within theirs!
>
>If anyone has questions about the application of the code section with
>battery-less systems, I have created a spreadsheet to help me (and others)
>evaluate these conditions.  It will be available at my web site in a few
>minutes:
>
>http://mpandc.com/
>
>Click on Downloads
>
>Click on the link "Point of connection spreadsheet."  Instructions are
>included.
>
>I have included the values for several common residential inverters.  You
>can add your own models and copy across the formulas easily.
>
>Please note that Excel is not my preferred spreadsheet application, so I
>can not guarantee the results.  Input is appreciated.
>
>
>William Miller
>
>
>
>
>
>At 12:44 PM 1/18/2006, Keith Cronin wrote:
> >We have a client that has an existing 200 amp electrical service. They are
> >doing a complete remodel, addition with some heavy AC and other stuff-
> >pools, water features etc.
> >
> >
> >
> >The engineer did a calculation of 298 amps. The work involved to bring the
> >service up to 325 amps (next standard size here) is lengthy, costly, and
> >somewhat challenging.
> >
> >
> >
> >We are installing 10KW of PV, 4 - 3048 Outback's, and a small battery
> >system.
> >
> >
> >
> >They are eager to not upgrade to 325 amps, and I know the limitations
> >outlined, Per NEC- 690.64 B 2 exception regarding the busbar rating.
> >
> >
> >
> >Any thoughts on this?
> >

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