<div dir="auto">We tend to do this on every install in the Bahamas, except that we install a manual transfer switch instead of an automatic one. <div dir="auto">It's a bit of a (minor) pain for the customer, but a very reasonably priced add on as "emergency" backup. We haven't had any trouble selling the logic of it to the client, either </div><div dir="auto"><br></div><div dir="auto">Daryl</div></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Tue, Jan 14, 2025, 3:13 PM david quattro via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org">re-wrenches@lists.re-wrenches.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto">I’ve been doing this for a few years now, but not on every install. They’re pretty expensive, more labor, one more component to fail, and takes up significant wall space/aesthetic factor. </div><div dir="auto"> GENERAC transfer switch requires you to rig a separate 12v power supply, (normally this 12vdc comes from the generator start battery) to triggers transfer you have to trick the control module by shorting “23Transfer” to Ground. Here is an excellent YouTube video demonstration. <div><a href="https://youtu.be/rT_3JYZS9Mg?si=7EarqHXTddLSpKXe" target="_blank" rel="noreferrer">https://youtu.be/rT_3JYZS9Mg?si=7EarqHXTddLSpKXe</a></div></div><div dir="auto"> KOHLER: use their RDT model ! Don’t use the RXT model, as their RXT really does need a complex computer handshake signal from a true Kohler generator. The _RDT_ is sweet - senses primary versus secondary, and switches back and forth automatically.</div><div dir="auto">David Q</div><div dir="auto"><br></div><div dir="auto"><br></div><div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Tue, Jan 14, 2025 at 11:36 AM William Miller via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank" rel="noreferrer">re-wrenches@lists.re-wrenches.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-style:solid;padding-left:1ex;border-left-color:rgb(204,204,204)"><div lang="EN-US" link="blue" vlink="purple"><div><p class="MsoNormal"><span style="font-family:Verdana,sans-serif;color:rgb(31,73,125)">Stuart:</span></p><p class="MsoNormal"><span style="font-family:Verdana,sans-serif;color:rgb(31,73,125)"> </span></p><p class="MsoNormal"><span style="font-family:Verdana,sans-serif;color:rgb(31,73,125)">I understand the concern and appreciate the consideration to provide more reliability. The approach you suggested sounds like a band-aid, not a cure. </span></p><p class="MsoNormal"><span style="font-family:Verdana,sans-serif;color:rgb(31,73,125)"> </span></p><p class="MsoNormal"><span style="font-family:Verdana,sans-serif;color:rgb(31,73,125)">I do not know if this complete shutdown is required by the listing (a feature) or is just a bug. Does anyone have information on this? If it is not required, the manufacturers should certainly correct these problems. </span></p><p class="MsoNormal"><span style="font-family:Verdana,sans-serif;color:rgb(31,73,125)"> </span></p><p class="MsoNormal"><span style="font-family:Verdana,sans-serif;color:rgb(31,73,125)">This may be a case against All-in-on inverters. If there is a PV arc fault on systems with separate charge controllers the inverter will not curtail operation and it’s pass-through capabilities.</span></p><p class="MsoNormal"><span style="font-family:Verdana,sans-serif;color:rgb(31,73,125)"> </span></p><p class="MsoNormal"><span style="font-family:Verdana,sans-serif;color:rgb(31,73,125)">William Miller</span></p><p class="MsoNormal"><span style="font-family:Verdana,sans-serif;color:rgb(31,73,125)"> </span></p><p class="MsoNormal"><span style="font-family:Arial,sans-serif;color:rgb(31,73,125)">Miller Solar</span></p><p class="MsoNormal"><span style="font-family:Arial,sans-serif;color:rgb(31,73,125)">17395 Oak Road, Atascadero, CA 93422</span></p><p class="MsoNormal"><span style="font-family:Arial,sans-serif;color:rgb(31,73,125)">805-438-5600</span></p><p class="MsoNormal"><span style="font-family:Arial,sans-serif;color:rgb(31,73,125)"><a href="http://www.millersolar.com/" style="font-family:Arial,sans-serif" target="_blank" rel="noreferrer"><span style="font-family:Arial,sans-serif;color:blue">www.millersolar.com</span></a></span></p><p class="MsoNormal"><span style="font-family:Arial,sans-serif;color:rgb(31,73,125)">CA Lic. 773985</span></p><p class="MsoNormal"><span style="font-size:11pt;font-family:Calibri,sans-serif;color:rgb(31,73,125)"> </span></p><p class="MsoNormal"><span style="font-family:Verdana,sans-serif;color:rgb(31,73,125)"> </span></p><p class="MsoNormal"><b><span style="font-size:10pt;font-family:Tahoma,sans-serif">From:</span></b><span style="font-size:10pt;font-family:Tahoma,sans-serif"> RE-wrenches [mailto:<a href="mailto:re-wrenches-bounces@lists.re-wrenches.org" style="font-family:Tahoma,sans-serif" target="_blank" rel="noreferrer">re-wrenches-bounces@lists.re-wrenches.org</a>] <b style="font-family:Tahoma,sans-serif">On Behalf Of </b>Stuart Kriendler via RE-wrenches<br><b style="font-family:Tahoma,sans-serif">Sent:</b> Tuesday, January 14, 2025 11:09 AM<br><b style="font-family:Tahoma,sans-serif">To:</b> <a href="mailto:re-wrenches@lists.re-wrenches.org" style="font-family:Tahoma,sans-serif" target="_blank" rel="noreferrer">re-wrenches@lists.re-wrenches.org</a><br><b style="font-family:Tahoma,sans-serif">Cc:</b> Stuart Kriendler<br><b style="font-family:Tahoma,sans-serif">Subject:</b> [RE-wrenches] ATS models to bypass GT hybrid inverters for maintenance/faults</span></p><p class="MsoNormal"> </p><div><div><p class="MsoNormal">Good day Wrenches,</p></div><div><p class="MsoNormal"> </p></div><div><p class="MsoNormal">2025 looks to be the year for installing more grid tied (GT) battery back up hybrid inverters on new and existing GT PV systems in a whole house backup scenario</p></div><div><p class="MsoNormal">i.e. Utility - Hybrid Inverter - House Loads</p></div><div><p class="MsoNormal"> </p></div><div><p class="MsoNormal">With these newer GT hybrids so 'sensitive', any fault on the PV side can cause them to shut down, thus stopping power to the house. </p></div><div><p class="MsoNormal">To minimise this it seems sensible to add an ATS to the system such that if/when the hybrid faults, the ATS w switch to grid power, bypass the hybrid, and power the house.</p></div><div><p class="MsoNormal">This could save an emergency truck roll or late night phone call for installers.</p></div><div><p class="MsoNormal"> </p></div><div><p class="MsoNormal">Anyone have experience on good value-for-money Listed automatic transfer switches that would do the job, 200A, 120/240V?</p></div><div><p class="MsoNormal"> </p></div><div><p class="MsoNormal">Two name brand options that came up on the less expensive end of the spectrum are:</p></div><div><p class="MsoNormal"><span style="color:rgb(34,34,34)">- </span>Generac RXSW200A3 (<a href="https://www.generac.com/residential-products/standby-generator-transfer-switches/automatic/rxsw200a3/" target="_blank" rel="noreferrer">https://www.generac.com/residential-products/standby-generator-transfer-switches/automatic/rxsw200a3/</a>)</p></div><div><p class="MsoNormal"> </p></div><div><p class="MsoNormal">- <b><span style="font-size:11pt;font-family:Aptos;color:black">Kohler 200-amp, Service Entrance RXT ATS | RXT-JFNC-200ASEQS4 (</span></b><a href="https://www.kohler.com/content/dam/kohler-com-NA/Lifestyle/PDF/PDF-g11152.pdf" target="_blank" rel="noreferrer">https://www.kohler.com/content/dam/kohler-com-NA/Lifestyle/PDF/PDF-g11152.pdf</a>)</p></div><div><p class="MsoNormal"> </p></div><div><p class="MsoNormal">However, they each say their ATSs must be used with the corresponding generator.</p></div><div><p class="MsoNormal"> </p></div><div><p class="MsoNormal">I would imagine a simple 'grid sense' functionality would mean that if the hybrid's output was connected to the Grid/Normal lugs and the grid was connected to the Gene/Backup lugs in the ATS it should work.</p></div><div><p class="MsoNormal">However I don't want to end up with an expensive surprise in a relatively remote location where I operate!</p></div><div><p class="MsoNormal"> </p></div><div><p class="MsoNormal">Would appreciate any feedback with experience with the above or other ATS models or how people are future proofing for this scenario?<br>To do future maintenance/torque checks etc. in a GT hybrid whole home backup situation, it would be nice to bypass the inverter and keep the house powered for safety and homeowner convenience in general.</p></div><div><p class="MsoNormal"> </p></div><div><p class="MsoNormal">Thanks and best.</p></div><div><p class="MsoNormal"> </p></div><div><div><div><p class="MsoNormal">Sunniest regards,</p><div><p class="MsoNormal">Stuart</p></div><div><p class="MsoNormal">441 599 2105</p></div></div></div></div></div></div></div>
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