<div dir="ltr">Hi Dan,<div><br></div><div>You can use a Santon Arc fault detection unit. This has arc detection and some low voltage contacts to drive power relays in case of an arc fault. You need to provide a power supply and the power contactors. You can buy all of the stuff on the website: <a href="http://www.dcsunvolt.com/">http://www.dcsunvolt.com/</a></div><div>It turns out to be expensive and it may make more sense to upgrade charge controllers.</div><div>Maybe there is a cheaper way, but I haven't ran across it.</div><div><br></div><div>Thanks</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Aug 28, 2016 at 6:35 AM, Dan Fink <span dir="ltr"><<a href="mailto:danbob88@gmail.com" target="_blank">danbob88@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="ltr">Esteemed Wrenches;<div><br></div><div>How are folks here dealing with NEC 690.11 AFCI PV DC requirements on ground-mount, off-grid and multimode systems? My client purchased his equipment for 2 systems prior to 2013, when Colorado started enforcing 690.11 in the NEC 2011 code and we haven't done the installs yet due to construction delays; they just got their CO a month ago.</div><div><br></div><div>His grid-tie battery backup system has 3 Morningstar MPPT-60 600Voc controllers, and his off-grid system 2 Morningstar MPPT-60 150Voc controllers.</div><div><br></div><div>I've been out of the loop on this one for a couple years since I've been installing all Midnite Classics that have AFCI built in. I'm not seeing any options for in the combiner box from my regular suppliers of breakers and such (he already has the combiner boxes).</div><div><br></div><div>690.12 is also going to be an issue now that Colorado is enforcing it for ground mount arrays. The Midnite combiners he bought in 2013 are not compatible with the Birdhouse. </div><div><br></div><div>Perhaps installation will be delayed further, and 690.12 will be waived for ground mount arrays in NEC 2017? I can only hope.</div><div><br></div><div>Any input appreciated. </div><span class="HOEnZb"><font color="#888888"><div><div class="gmail_extra"><br clear="all"><div><div data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><span style="font-size:12.8000001907349px">Dan Fink</span><div style="font-size:12.8000001907349px">Adjunct Professor of Solar Energy Technology, Ecotech Institute</div><div style="font-size:12.8000001907349px">IREC Certified Instructor™ for: </div><div style="font-size:12.8000001907349px">~ PV Installation Professional</div><div style="font-size:12.8000001907349px">~ Small Wind Installer</div><div style="font-size:12.8000001907349px">Executive Director, Buckville Energy</div><div style="font-size:12.8000001907349px">NABCEP Registered Continuing Education Providers™<br><a href="tel:970.672.4342" value="+19706724342" style="color:rgb(17,85,204)" target="_blank">970.672.4342</a></div><br> </div></div></div></div></div></div></div></div></div></div></div></div></font></span></div>
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