Wrenches,
I am designing a system with both wind and solar backfeed and I'm having
an issue with the utility. They say we need to have a single renewable
disconnect switch before the grid backfeed. The solar is designed to backfeed
3-phase through a meter, then a fused AC disconnect to the line-side to avoid
upsizing the MDP. The wind inverter output is 120/240V split-phase (10A) which
I had planned to do load-side backfeed through a wind meter with a seperate AC
disconnect since it was so small. To meet the single renewable disconnect
requirement, I'm thinking I may need to backfeed the wind on the load-side to
one of the three phases. I guess my question is can I use a single 5 pole
fused AC disconnect to control both with one switch handle or is that an NEC
violation wrt to merging separate systems within the same conduit? Or, should
I keep them in separate switch boxes with some kind of gang handle? I have a
3-phase aggregation panel for the solar inverters (6 total, 2 per phase, 240
delta), but if I integrate the wind there in order to simplify the AC
disconnect issue, the solar meter will register both solar and wind production.
What is the best practice in this situation?
Thanks,
John Wadley, MSEE, PE
NABCEP Certified Solar PV Installer (TM)
Wadley Engineering
214-557-3841
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