[RE-wrenches] One renewable disconnect.

[John Wadley]

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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