<div dir="ltr"><div>Hi Stuart -</div><div><br></div><div>Many grid tied PV/ESS manufacturers (Enphase, SolarEdge, Franklin, Tesla to name a few) now have a Microgrid Interconnect Device (MID) that essentially acts as a smart transfer switch thus eliminating the need for a 3rd party automatic transfer switch. What brands equipment are you looking at?</div><div><br></div><div>Best, August</div></div><br><div class="gmail_quote gmail_quote_container"><div dir="ltr" class="gmail_attr">On Tue, Jan 14, 2025 at 11:10 AM Stuart Kriendler 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:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr"><div>Good day Wrenches,</div><div><br></div><div>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</div><div>i.e. Utility - Hybrid Inverter - House Loads</div><div><br></div><div>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. </div><div>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.</div><div>This could save an emergency truck roll or late night phone call for installers.</div><div><br></div><div>Anyone have experience on good value-for-money Listed automatic transfer switches that would do the job, 200A, 120/240V?</div><div><br></div><div>Two name brand options that came up on the less expensive end of the spectrum are:</div><div><a style="box-sizing:border-box"><font color="#222222">- </font></a><a style="font-family:Roboto,sans-serif;font-size:16px;box-sizing:border-box">Generac RXSW200A3 (https://www.generac.com/residential-products/standby-generator-transfer-switches/automatic/rxsw200a3/)</a></div><div><br></div><div>- <span style="color:rgb(0,0,0);font-family:Aptos,Aptos_EmbeddedFont,Aptos_MSFontService,Calibri,Helvetica,sans-serif;font-size:14.6667px;font-weight:700">Kohler 200-amp, Service Entrance RXT ATS | RXT-JFNC-200ASEQS4 (</span><a href="https://www.kohler.com/content/dam/kohler-com-NA/Lifestyle/PDF/PDF-g11152.pdf" target="_blank">https://www.kohler.com/content/dam/kohler-com-NA/Lifestyle/PDF/PDF-g11152.pdf</a>)</div><div><br></div><div>However, they each say their ATSs must be used with the corresponding generator.</div><div><br></div><div>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.</div><div>However I don't want to end up with an expensive surprise in a relatively remote location where I operate!</div><div><br></div><div>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.</div><div><br></div><div>Thanks and best.</div><div><br></div><div><div dir="ltr" class="gmail_signature"><div dir="ltr">Sunniest regards,<div>Stuart</div><div>441 599 2105</div></div></div></div></div>
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