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:
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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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