[RE-wrenches] Rooftop DC disconnects

[Starlight Solar Power Systems]

Hello Howie,

I attached it to my email on 9-24-2015. In brief, a HV relay disconnects the PV array and optional relay disconnects the battery. Midnite plans to add the arc fault Aux feature. Here it is again:


I asked Midnite about using the Aux circuit for control for ground or arc faults. They said this will (should) be added on the next firmware update. This means if an arc fault is detected, the Classic will shut down AND conductors leaving the array would be de-energized by switching off the HV relay. All automatically. A second relay could be connected to the battery for total system shutdown. Should be easy to build a circuit to re-energize everything after a fault.

Wouldn't this automatic method be better than waiting for someone to throw a switch to shut things down? You would have to run the low voltage control wire and perhaps put the relays in an enclosure. A disconnect switch could be in series for manual shutdown. What am I missing?





On Sep 26, 2015, at 9:20 AM, Howie Michaelson <howie at suncatchervt.com> wrote:

Larry,
Could you possibly sketch out a rough schematic for what you are talking about here? It would help me understand your suggestion better.
Thanks, Howie

Howie Michaelson
NABCEP Certified Solar PV Installer™

Catamount Solar
Renewable Energy Systems Sales and Service
VT Solar Electric Incentive Partner
http://www.CatamountSolar.com <http://www.catamountsolar.com/>
802-272-0004


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