We tend to do this on every install in the Bahamas, except that we install a manual transfer switch instead of an automatic one. 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
Daryl On Tue, Jan 14, 2025, 3:13 PM david quattro via RE-wrenches < [email protected]> wrote: > 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. > 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. > https://youtu.be/rT_3JYZS9Mg?si=7EarqHXTddLSpKXe > 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. > David Q > > > > On Tue, Jan 14, 2025 at 11:36 AM William Miller via RE-wrenches < > [email protected]> wrote: > >> Stuart: >> >> >> >> I understand the concern and appreciate the consideration to provide more >> reliability. The approach you suggested sounds like a band-aid, not a >> cure. >> >> >> >> 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. >> >> >> >> 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. >> >> >> >> William Miller >> >> >> >> Miller Solar >> >> 17395 Oak Road, Atascadero, CA 93422 >> >> 805-438-5600 >> >> www.millersolar.com >> >> CA Lic. 773985 >> >> >> >> >> >> *From:* RE-wrenches [mailto:[email protected]] *On >> Behalf Of *Stuart Kriendler via RE-wrenches >> *Sent:* Tuesday, January 14, 2025 11:09 AM >> *To:* [email protected] >> *Cc:* Stuart Kriendler >> *Subject:* [RE-wrenches] ATS models to bypass GT hybrid inverters for >> maintenance/faults >> >> >> >> Good day Wrenches, >> >> >> >> 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 >> >> i.e. Utility - Hybrid Inverter - House Loads >> >> >> >> 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. >> >> 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. >> >> This could save an emergency truck roll or late night phone call for >> installers. >> >> >> >> Anyone have experience on good value-for-money Listed automatic transfer >> switches that would do the job, 200A, 120/240V? >> >> >> >> Two name brand options that came up on the less expensive end of the >> spectrum are: >> >> - Generac RXSW200A3 ( >> https://www.generac.com/residential-products/standby-generator-transfer-switches/automatic/rxsw200a3/ >> ) >> >> >> >> - *Kohler 200-amp, Service Entrance RXT ATS | RXT-JFNC-200ASEQS4 (* >> https://www.kohler.com/content/dam/kohler-com-NA/Lifestyle/PDF/PDF-g11152.pdf >> ) >> >> >> >> However, they each say their ATSs must be used with the corresponding >> generator. >> >> >> >> 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. >> >> However I don't want to end up with an expensive surprise in a relatively >> remote location where I operate! >> >> >> >> Would appreciate any feedback with experience with the above or other ATS >> models or how people are future proofing for this scenario? >> 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. >> >> >> >> Thanks and best. >> >> >> >> Sunniest regards, >> >> Stuart >> >> 441 599 2105 >> _______________________________________________ >> List sponsored by Redwood Alliance >> >> Pay optional member dues here: http://re-wrenches.org >> >> List Address: [email protected] >> >> Change listserver email address & settings: >> http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org >> >> There are two list archives for searching. When one doesn't work, try the >> other: >> https://www.mail-archive.com/[email protected]/ >> http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org >> >> List rules & etiquette: >> http://www.re-wrenches.org/etiquette.htm >> >> Check out or update participant bios: >> http://www.members.re-wrenches.org >> >> _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > List Address: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > There are two list archives for searching. When one doesn't work, try the > other: > https://www.mail-archive.com/[email protected]/ > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > http://www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > http://www.members.re-wrenches.org > >
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