<div dir="ltr">If the PV home runs are below 600V, you shouuld be OK using 600V CAT 5 as far as NEC 300.3(C)(1) goes.<div>But it sounds to me like an RFI / noisy signal nightmare on the CAT 5 waiting to happen.</div><div><br></div><div>This Blackout Relay scheme for preventing battery overcharge when AC coupling is not optimal...it provides only 1-stage battery charging, 5 minutes in bulk then 5 minutes off (UL1741). Much better to use a diversion load controller and diversion load for 3-stage charging, though with a large PV array that can get expensive fast. Or SMA sunny-boy/sunny-boy/sunny-island clusters which can do 3-stage by frequency shifting, but he already has Outback.</div><div><br></div><div>I guess it boils down to how often there are grid blackouts. If they are rare and short, 1-stage charging shouldn't hurt anything. If he's prepping for the end of the world as we know it, he should go the diversion controller route IMO.<br><div><br></div></div></div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature" 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>
<br><div class="gmail_quote">On Mon, Aug 22, 2016 at 7:25 AM, John Blittersdorf <span dir="ltr"><<a href="mailto:john.blittersdorf@gmail.com" target="_blank">john.blittersdorf@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">Wrenches,<div> I have a customer who has pulled a cat 5 cable through his power conduit (2" PVC) to a new barn for about 120' and wants to use it for ethernet and telephone. Wants me to use a pair if wires in the cable to trigger a relay to disconnect a direct grid tie inverter (AC Coupling) when batteries are full on his double GVFX3648 backup system He wants it in writing from experts that it is not a good idea. Has anyone done this and had good luck with it or have opinions?</div><div><br></div><div>John Blittersdorf</div><div><br></div><div>formerly owner of Central Vermont Solar & Wind</div><div>now working for the new owner Rob Stubbins Solar </div><div>(I get a regular paycheck and (usually) regular hours. </div></div>
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