On 10/9/12 9:45 AM, David Robbins wrote:
The NEC rules (and similar.. NFPA 780 for lightning) are evolving fairly
rapidly for solar panels. Solar panels raise all sorts of complex
issues.. For instance, you can't turn them off.. if there's light on
them, there's power coming out.
John's, like mine and many other new installations, use a system that does kind
of turn-off... each panel has a micro-inverter that takes the output
from the one panel and converts it to 220vac and feeds it back into the house
and grid. they sync with the grid and if they don't sense the incoming
grid voltage they shut off. this is a safety requirement to prevent
backfeeding the street in case of power outage. see
http://enphase.com/products/microinverters/
yes.. the microinverter systems are great for just the reasons you
list.. The firefighters especially like them. They're none-too-wild
about taking an axe to a conduit with HV DC at many amps..
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