calculation (point of attachment)[RE-wrenches]

[William Miller]

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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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