Stand Alone PV system volt / amp problem [RE-wrenches]

[Phil Undercuffler]

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Jeremy Rodriquez had the same problem not one month ago.  Search your
wrenches for subject: "100amp Service from an Inverter?"

The answer is 690.10(A), where the ac inverter output shall be permitted to
supply ac power to the building at current levels below the rating of that
disconnecting means, and 690.10(C) where the inverter output of a standalone
system shall be permitted to supply 120v to 120/240v service equipment where
there are no 240v outlets or shared neutral circuits.

The final trump card is 690.3, which states that wherever the requirements
of other articles of the Code and 690 differ, the requirements of 690 win.

Good luck, and if there is an AHJ that is pressing for unreasonable
requirements, perhaps it is time for a little friendly education.

Was it Matt that had all the good lines about bringing donuts?
 
Phil Undercuffler ext.238
Technical Support
phil at dankoffsolar.com

Dankoff Solar Products
    
The Premier Manufacturer and Distributor of Solar Water Pumps, and
Wholesale Distributor of Solar Electric, Wind, and Solar Heating Equipment

888-396-6611 toll free
505-473-3800 phone
505-473-3830 fax
www.dankoffsolar.com




on 4/7/05 10:24 AM, Chris Anderson at chris at borregosolar.com wrote:

> Any help on this one would be appreciated.
> 
> We have an off grid home, where we have installed 12 Shell 160's 6x2 on
> an Outback VFX 2548 with 8 6v Concorde Batteries. The system is feeding
> a 100 amp Square D main distribution center. Given the inverter output
> is only 120 volt, we fed inverter output L1 to one leg of the 100 amp
> main breaker at the top of the main distribution panel and jumpered over
> to the second bus/lug on the main breaker in order to electrify both
> bus' in the panel with 120v power. There is a 50amp breaker on the AC
> output circuit of the inverter.
> 
> I have two problems.
> 
> 1. I have got an inspector who is saying that manufactured homes MUST be
> fed by 240V power. He is adamant that the main distribution panel must
> be fed by 240v. We have jumpered the bus in grid tie battery back-up
> systems like this before, but never on an off grid. Anyone have any
> thoughts here or can point me to a code section that either confirms or
> negates what we have done?
> 
> 2. The inspector is also saying that panel must be fed with the amps
> indicated on the main breaker. In this case, the main breaker is
> 100amps, therefore it must be fed with 100A. Either that or the main can
> be replaced if a load calc is done and the home is "de-amped". He has
> taken issue with the 100 amp main being fed by the inverter given the 50
> amp breaker on the AC output side of the inverter.
> 
> Any help/insight on these two issues would be greatly appreciated.
> Thanks in advance.
> 
> 
> 
> Chris Anderson
> Borrego Solar Systems, Inc.
> 727 Allston Way, Suite B
> Berkeley, CA 94710
> Tel. - 510-843-1113 x 105
> Fax - 510-843-1116
> Cell - 510-501-7062

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