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

Thu Apr 7 13:18:28 PDT 2005

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Or maybe you can upgrade to a pair of OBs?

Matt T

Jerry Caldwell wrote:

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>Chris,
>
>I'm not sure which edition of the NEC your building
>department has adapted.  I have a 1999 code book
>handy, but I suspect there may have been some changes
>regarding manufactured homes in the last two editions.
>
>Some county jurisdictions use the California
>Electrical Code, which sometimes goes a little further
>than the NEC.
>
>NEC Article 550 covers manufactured homes, and 230
>covers services.  The 1999 code makes no mention of
>240 volts being required for manufactured homes
>specifically, but does say " mobile home service
>equipment shall be rated at not less than 120/240
>votts".  That might be where he's deriving his stance.
>
>I suspect it might boil down to what it says in the
>1999 code, Article 550-23(B)(2) -- the service
>equipment shall be "installed in a manner acceptable
>to the authority having jurisdiction."
>
>If he makes you add a transformer, you can tell your
>customer it was the inspector's desire to make you go
>beyond the code and there's nothing you could do about
>it.  If your customer doesn't want to pay for the
>transformer, having him speak directly to the
>inspector might at least help persuade him to spend
>the few extra bucks.
>
>It's possible your inspector never worked as an
>electrician or did electrical design work.  A lot of
>inpsectors just take code classes to become
>"qualified" for thier job.  That might explain why he
>doesn't like your functional solution for the
>situation at hand.
>
>Unfortunately, it all comes back to your ability to
>persuade this guy in the end - he's the a.h.j.
>
>Hope this helps,
>
>Jerry Caldwell
>Light Energy Systems
>
>--- Chris Anderson <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
>>    
>>
>
>Jerry Caldwell
>NABCEP Certified PV Installer
>Light Energy Systems
>965 Detroit Ave
>Concord, CA 94518
>
>925-680-4343 office
>510-205-2798 mobile
>
>
>		
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