These code references should be all that is necessary to put the
inspector on the right path. His requirement that the source be capable
of 100 amps clearly conflicts with the intent of 690.10(A); it makes
clear that the inverter system only needs to be large enough to operate
the single largest load that it is intended to operate. Thus it is
permissible for combinations of loads to overload the inverter and cause
a nuisance shutdown.
You might also ask if he'd be happy with a utility service provided by a
15-kVA transformer. While capable of substantial overloads, it is only
rated to provide 63 amps continuously. Most 200-amp service panels don't
really have 200 amps available except for short durations.
Kent Osterberg
Blue Mountain Solar, Inc.
www.bluemountainsolar.com
t: 541-568-4882
On 12/12/2012 4:43 AM, Jason Szumlanski wrote:
See 690.10, 690.1, and 690.3.
*Jason Szumlanski*//
/Fafco Solar/
On Wed, Dec 12, 2012 at 1:00 AM, William Miller
<will...@millersolar.com <mailto:will...@millersolar.com>> wrote:
Jeff:
There is a code passage that specifically states that one does not
need to provide full rated ampacity to a service. I am sure you
can find it.
Find a way to prove, mathematically, that the system planned will
provide adequate power. Create or find a spreadsheet listing all
appliances and wattages and system watt hours provided. Dress it
up, put your logo on it and sell it to the building department.
William Miller
At 07:52 PM 12/11/2012, you wrote:
Content-Type: multipart/alternative;
boundary="----=_NextPart_000_0006_01CDD7F2.373D3CB0"
Content-Language: en-us
We have a client that just had assembled on his rural property
a pre-fab modular home with "normal" wiring and 200 amp main
panel and meter base. However, landowners around his property
will not grant access for electric utility to cross and he
needs to move in ASAP. He realizes that some day he should be
able to resolve this utility access but until then he wants us
to do an off-grid "basic" solar system with generator backup
so he can at least power lights, well pump, and basic
appliances. His budget will not allow a fully off-grid solar
system so we wanted to do reduced solar and battery system
with larger generator to fill in on bad solar days. He does
have good solar exposure and lots of cleared land, but figures
one day the solar and generator will become a backup system to
a future grid connection so does not want to spend any more
than absolutely necessary.
However ,this local inspector for this rural county has no
experience with solar and is expecting to see a 200 amp
service connection from the utility before allowing occupancy.
He did hint that a 100 amp service connection may be allowed
but nothing less. I know NEC does mention that a panel does
not have to be supplied with the amount of service capacity it
is rated for, but what other code issues can I point out to
get this accepted without getting into a pis----- contest?
Thanks,
Jeff Yago
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