<div dir="ltr">The Radian grid AC in is connected to the utility side of the transfer switch. You may need a service rated fused disconnect on that line, probably 60A. Then you can feed the AC out to the generator input on the transfer switch to power the main house panel. It's best and usually required by code (depending on UL1741 or UL9540) to use a manual transfer switch or adequate load control, or total house loads that the Radian can handle. Getting the aux on the Radian to start/stop the generator involves tracing the signal wires in the transfer switch (if automatic) and using those.<div><br></div><div>Brad</div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Dec 17, 2022 at 9:44 AM William Miller 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="auto">Dana:</div><div dir="auto"><br></div><div dir="auto">I have never incorporated a transfer switch with a battery inverter. The inverter’s internal transfer relay with the smarts it provides has always been preferred. </div><div dir="auto"><br></div><div dir="auto">I have of course used a transfer switch for generator-only systems. In some cases the generator is rated smaller than the utility feed and the user needs to live within the capabilities of the generator on the rare occasion when the utility is down. </div><div dir="auto"><br></div><div dir="auto">So your scenario brings up an interesting option: using a full 200 amp transfer switch means the Radian is not a 50 amp bottleneck when the utility is up. The Radian would become an ersatz generator connected to the gen input on the transfer switch. </div><div dir="auto"><br></div><div dir="auto">The wrinkle is: how do you provide an AC input to the Radian to charge batteries when the grid is up without triggering the transfer switch? </div><div dir="auto"><br></div><div dir="auto">When the Radian sees AC input it wants to through-transfer. There must be some way to configure the transfer switch to not trigger when the grid is up. Then a breaker from the main panel feeds the Radian, the Radian charges batteries and the Radian output goes nowhere. </div><div dir="auto"><br></div><div dir="auto">However when the grid does go down and the transfer happens you have a power flow loop which will shut down the Radian. </div><div dir="auto"><br></div><div dir="auto">I imagine there is some scheme of running the Radian input through a contractor that would be opened when the transfer switch connects the Radian output to the load. I think if you solve that you may have a working option. This does add a layer of complexity, however. </div><div dir="auto"><br></div><div dir="auto">Good luck. </div><div dir="auto"><br></div><div dir="auto">William Miller </div><div dir="auto"><br></div><div dir="auto">PS: You could use an outboard battery charger, however that is a waste of the very good battery charger built into the Radian</div><div dir="auto"><br></div><div dir="auto">Wm</div><div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Dec 17, 2022 at 8:28 AM Dana Orzel via RE-wrenches <<a href="mailto:re-wrenches@lists.re-wrenches.org" target="_blank">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 lang="EN-US" style="overflow-wrap: break-word;"><div><p class="MsoNormal"><span style="font-size:14pt;font-family:"Century Gothic",sans-serif">Hey All a Cheery Season to you all!<u style="font-family:"Century Gothic",sans-serif"></u><u style="font-family:"Century Gothic",sans-serif"></u></span></p><p class="MsoNormal"><span style="font-size:14pt;font-family:"Century Gothic",sans-serif"><u style="font-family:"Century Gothic",sans-serif"></u> <u style="font-family:"Century Gothic",sans-serif"></u></span></p><p class="MsoNormal"><span style="font-size:14pt;font-family:"Century Gothic",sans-serif">I inherited a backup system that had “failed”. It was unwired, & poorly labeled.<u style="font-family:"Century Gothic",sans-serif"></u><u style="font-family:"Century Gothic",sans-serif"></u></span></p><p class="MsoNormal"><span style="font-size:14pt;font-family:"Century Gothic",sans-serif"><u style="font-family:"Century Gothic",sans-serif"></u> <u style="font-family:"Century Gothic",sans-serif"></u></span></p><p class="MsoNormal"><span style="font-size:14pt;font-family:"Century Gothic",sans-serif">1200 AHR AGM Battery – 1 Radian 8KW inverter – 200 amp Generac transfer switch – No solar - Feeding a 200 amp house panel.<u style="font-family:"Century Gothic",sans-serif"></u><u style="font-family:"Century Gothic",sans-serif"></u></span></p><p class="MsoNormal"><span style="font-size:14pt;font-family:"Century Gothic",sans-serif"><u style="font-family:"Century Gothic",sans-serif"></u> <u style="font-family:"Century Gothic",sans-serif"></u></span></p><p class="MsoNormal"><span style="font-size:14pt;font-family:"Century Gothic",sans-serif">First I explained the there were too many loads for an 8KW inverter. It could & may overload the 8KW inverter. They said “it had worked fine for 5 years & they were OK with it as is please get it back up”…<u style="font-family:"Century Gothic",sans-serif"></u><u style="font-family:"Century Gothic",sans-serif"></u></span></p><p class="MsoNormal"><span style="font-size:14pt;font-family:"Century Gothic",sans-serif">Replaced the existing Eaton transfer switch as the Generac controller was shot, with a Generac 200 amp Xfer switch complete with controller & transfer switch.<u style="font-family:"Century Gothic",sans-serif"></u><u style="font-family:"Century Gothic",sans-serif"></u></span></p><p class="MsoNormal"><span style="font-size:14pt;font-family:"Century Gothic",sans-serif">Rewired & had to recharge the 48 volt battery from 20volt back up to full with a pair of IOTA chargers in series.<u style="font-family:"Century Gothic",sans-serif"></u><u style="font-family:"Century Gothic",sans-serif"></u></span></p><p class="MsoNormal"><span style="font-size:14pt;font-family:"Century Gothic",sans-serif"><u style="font-family:"Century Gothic",sans-serif"></u> <u style="font-family:"Century Gothic",sans-serif"></u></span></p><p class="MsoNormal"><span style="font-size:14pt;font-family:"Century Gothic",sans-serif">The original trigger was 3 wires from the Radian to the 12 volt & AUX output to the input on the Generac controller. These were disconnected on the Generac end. So no clue or labeling there.<u style="font-family:"Century Gothic",sans-serif"></u><u style="font-family:"Century Gothic",sans-serif"></u></span></p><p class="MsoNormal"><span style="font-size:14pt;font-family:"Century Gothic",sans-serif"><u style="font-family:"Century Gothic",sans-serif"></u> <u style="font-family:"Century Gothic",sans-serif"></u></span></p><p class="MsoNormal"><span style="font-size:14pt;font-family:"Century Gothic",sans-serif">I called Outback & they called it Redneck engineering & send me a few articles to read.<u style="font-family:"Century Gothic",sans-serif"></u><u style="font-family:"Century Gothic",sans-serif"></u></span></p><p class="MsoNormal"><span style="font-size:14pt;font-family:"Century Gothic",sans-serif"><u style="font-family:"Century Gothic",sans-serif"></u> <u style="font-family:"Century Gothic",sans-serif"></u></span></p><p class="MsoNormal"><span style="font-size:14pt;font-family:"Century Gothic",sans-serif">Has anyone configured a backup in this manner?<u style="font-family:"Century Gothic",sans-serif"></u><u style="font-family:"Century Gothic",sans-serif"></u></span></p><p class="MsoNormal"><span style="font-size:14pt;font-family:"Century Gothic",sans-serif"><u style="font-family:"Century Gothic",sans-serif"></u> <u style="font-family:"Century Gothic",sans-serif"></u></span></p><p class="MsoNormal"><span style="font-size:14pt;font-family:"Century Gothic",sans-serif">All suggestions appreciated, thanks & wishing you all a safe & sane season!<u style="font-family:"Century Gothic",sans-serif"></u><u style="font-family:"Century Gothic",sans-serif"></u></span></p><p class="MsoNormal"><span style="font-size:14pt;font-family:"Century Gothic",sans-serif"><u style="font-family:"Century Gothic",sans-serif"></u> <u style="font-family:"Century Gothic",sans-serif"></u></span></p><div style="border-style:none none solid;border-bottom-width:1.5pt;padding:0in 0in 1pt;border-bottom-color:windowtext"><p class="MsoNormal" style="border:none;padding:0in"><span style="font-size:14pt;font-family:"Century Gothic",sans-serif"><u style="font-family:"Century Gothic",sans-serif"></u> <u style="font-family:"Century Gothic",sans-serif"></u></span></p></div><p class="MsoNormal"><span style="font-family:"Century Gothic",sans-serif;color:rgb(0,32,96)"><u style="font-family:"Century Gothic",sans-serif"></u> <u style="font-family:"Century Gothic",sans-serif"></u></span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:"Century Gothic",sans-serif">Dana Orzel Great Solar Works, Inc. <u style="font-family:"Century Gothic",sans-serif"></u><u style="font-family:"Century Gothic",sans-serif"></u></span></p><p class="MsoNormal"><b><span style="font-size:14pt;font-family:"Century Gothic",sans-serif">C - 208.721.7003 <a href="mailto:dana@solarwork.com" style="font-family:"Century Gothic",sans-serif" target="_blank">dana@solarwork.com</a><u style="font-family:"Century Gothic",sans-serif"></u><u style="font-family:"Century Gothic",sans-serif"></u></span></b></p><p class="MsoNormal"><span style="font-size:12pt;font-family:"Century Gothic",sans-serif">Idaho Contractor - # 028765 Idaho PV # 028374<u style="font-family:"Century Gothic",sans-serif"></u><u style="font-family:"Century Gothic",sans-serif"></u></span></p><p class="MsoNormal"><span style="font-size:12pt;font-family:"Century Gothic",sans-serif"><a href="http://www.greatsolarworks.com/" style="font-family:"Century Gothic",sans-serif" target="_blank">www.greatsolarworks.com</a> <a href="http://www.solarwor.com" style="font-family:"Century Gothic",sans-serif" target="_blank">www.solarwor.com</a> <u style="font-family:"Century Gothic",sans-serif"></u><u style="font-family:"Century Gothic",sans-serif"></u></span></p><p class="MsoNormal"><u><span style="font-size:12pt;font-family:"Century Gothic",sans-serif">"Responsible Technologies for Responsible People since 1988" </span></u><u><span style="font-size:12pt;font-family:"Century Gothic",sans-serif"><u style="font-family:"Century Gothic",sans-serif"></u><u style="font-family:"Century Gothic",sans-serif"></u></span></u></p><p class="MsoNormal" style="background-color:white"><b><span style="font-size:18pt;font-family:Webdings;color:green"><u style="font-family:Webdings"></u> <u style="font-family:Webdings"></u></span></b></p><p class="MsoNormal" style="background-color:white"><b><span style="font-size:18pt;font-family:Webdings;color:green">P</span></b><span style="font-family:Helvetica,sans-serif;color:navy"> </span><span style="font-size:10pt;font-family:Arial,sans-serif;color:green">Please consider the environment before printing this email.</span><span style="font-family:Helvetica,sans-serif;color:black"><u style="font-family:Helvetica,sans-serif"></u><u style="font-family:Helvetica,sans-serif"></u></span></p><p class="MsoNormal"><u></u> <u></u></p><p class="MsoNormal"><u></u> <u></u></p></div></div>_______________________________________________<br>
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