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--></style></head><body bgcolor="white" lang="EN-US" link="blue" vlink="purple"><div class="WordSection1"><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">Mark:</span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">I think the task is to measure battery voltage and, if it gets too high, generate a signal to disconnect the AC coupled feed to the AC bus. Therefore the sample is DC, not AC. Simple matter of voltage dividing into an acceptable range.</span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">I submit that there are probably a lot of ways to skin this cat. For example a Trace C40 charge controller in diversion mode should give you a high state signal to open an AC relay on the grid-tied inverter AC output:</span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">Battery</span><span style="font-family:Wingdings;color:#1f497d">à</span><span style="font-family:"Verdana","sans-serif";color:#1f497d">C40 in diversion</span><span style="font-family:Wingdings;color:#1f497d">à</span><span style="font-family:"Verdana","sans-serif";color:#1f497d">Relay on output of GT inverter</span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">The question is, what application is robust enough to allow adequate confidence? Some people with experience can \u201croll-their-own\u201d and build solid assemblies that can handle the rigors of field use. If I am applying a solution to a remote site with a high requirement for reliability, I am looking for professionally manufactured off-the-shelf equipment. At home, I can Rube Goldberg as much as I want.</span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d">William</span></p><p class="MsoNormal"><span style="font-family:"Verdana","sans-serif";color:#1f497d"> </span></p><div><div style="border:none;border-top:solid #b5c4df 1.0pt;padding:3.0pt 0in 0in 0in"><p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif";color:windowtext"> RE-wrenches [mailto:<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org">re-wrenches-bounces@lists.re-wrenches.org</a>] <b>On Behalf Of </b>Mark Frye<br><b>Sent:</b> Saturday, November 2, 2019 7:32 PM<br><b>To:</b> <a href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a><br><b>Subject:</b> Re: [RE-wrenches] Parts List For AC Couple Disconnect</span></p></div></div><p class="MsoNormal"> </p><p>Glenn,</p><p>OK, while I would prefer to not get into compiling code onto an ARM, my main question would be, how do you get the voltage value into the Arduino?</p><p>Rectify the AC voltage and then voltage divide down to the chip input pin?</p><p>Mark</p><div><p class="MsoNormal">On 11/2/2019 10:14 AM, Glenn Burt wrote:</p></div><blockquote style="margin-top:5.0pt;margin-bottom:5.0pt"><div><div><p class="MsoNormal"><span style="font-size:10.0pt">Sounds like a job for an Arduino...</span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt"> </span></p></div><div><div><p class="MsoNormal"><span style="font-size:10.0pt">-Glenn</span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt">Sent from my 'smart'phone, so please excuse typos and spelling errors.</span></p></div></div></div><div><div id="LGEmailHeader"><div><p class="MsoNormal"><span style="font-size:10.0pt"> </span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt">------ Original message------</span></p></div><div><p class="MsoNormal"><b><span style="font-size:10.0pt">From: </span></b><span style="font-size:10.0pt">Mark Frye</span></p></div><div><p class="MsoNormal"><b><span style="font-size:10.0pt">Date: </span></b><span style="font-size:10.0pt">Sat, Nov 2, 2019 1:05 PM</span></p></div><div><p class="MsoNormal"><b><span style="font-size:10.0pt">To: </span></b><span style="font-size:10.0pt"><a href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a>;</span></p></div><div><p class="MsoNormal"><b><span style="font-size:10.0pt">Cc: </span></b><span style="font-size:10.0pt"></span></p></div><div><p class="MsoNormal"><b><span style="font-size:10.0pt">Subject:</span></b><span style="font-size:10.0pt">[RE-wrenches] Parts List For AC Couple Disconnect</span></p></div><div><p class="MsoNormal"><span style="font-size:10.0pt"> </span></p></div></div><pre>Folks,</pre><pre> </pre><pre>Can anyone share a parts list for setting up a AC couple disconnect?</pre><pre> </pre><pre>I want to couple a</pre><pre> non-frequency response grid-tied inverter to a </pre><pre>battery based stand-alone inverter.</pre><pre> </pre><pre>I have only 8 amps output from the GT inverters, so can use 10A relay </pre><pre>contacts.</pre><pre> </pre><pre>I want a device to monitor AC voltage and latch a coil on when it raises </pre><pre>above a set point (250VAC). I then want a timer to release the latch </pre><pre>after about 1 hour.</pre><pre> </pre><pre>Sound about right? Are any vendors selling such a device? How about a </pre><pre>parts list from Digikey?</pre><pre> </pre><pre>Thanks,</pre><pre> </pre><pre>Mark Frye</pre><pre> </pre><pre>_______________________________________________</pre><pre>List sponsored by Redwood Alliance</pre><pre> </pre><pre>List Address:<a href="mailto:%20RE-wrenches@lists.re-wrenches.org"> RE-wrenches@lists.re-wrenches.org</a></pre><pre> </pre><pre>Change listserver email address & settings:</pre><pre><a href="http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org">http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org</a></pre><pre> </pre><pre>List-Archive: http<a href="mailto:://www.mail-archive.com/re-wrenches@lists.re-wrenches.org">://www.mail-archive.com/re-wrenches@lists.re-wrenches.org</a>/<a href="http://maillist.ht">maillist.ht</a>ml</pre><pre> </pre><pre>List rules & etiquette:</pre><pre><a href="http://www.re-wrenches.org/etiquette.htm">www.re-wrenches.org/etiquette.htm</a></pre><pre> </pre><pre>Check out or update participant bios:</pre><pre><a href="http://www.members.re-wrenches.org">www.members.re-wrenches.org</a></pre><pre> </pre></div></blockquote></div></body></html>