calculation (point of attachment)[RE-wrenches]

[Keith Cronin]

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William

When I referred to "challenging", it was going to cost $40k to bring it up
to the site. A lot of trenching, concrete removal etc. It is about a 800'
conduit run. They already have an electrical contractor of "record" doing
the other electrical work on the house. We are just contracted to do the PV
system.

Thanks


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 4:16 PM
To: RE-wrenches at topica.com
Subject: RE: calculation (point of attachment)[RE-wrenches]

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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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