Also, it's unlikely in a tiny home, but double-check there are no multiwire branch circuits. Neutral could be overloaded once L1 and L2 are the same. There is a required label that states this in Article 710.15(C).
On Tue, Oct 18, 2022, 5:09 PM Vince McClellan via RE-wrenches < re-wrenches@lists.re-wrenches.org> wrote: > Hi Kris > I've successfully used a double pole double throw relay to handle this > issue with a couple of solar power trailers that I've built over the years. > You will need to bridge the inverter side of the transfer switch so that > the 120V single-phase inverter powers both the L-1 and L-2 buses of your > tiny home's electrical panel. Also if you use a relay or contactor make > sure that it is rated for the amperage that you need at *continuous use*, > or make sure that it is rated for way more amperage than you need. There > are a whole series of electrical contactors and relays that will say they > are rated at a much larger amperage than they can continuously handle. > > Your transfer switch idea may even work better if you have the physical > space for it. > > > > Vince McClellan > > Energy Design > > NABCEP PV Installation Professional > > p. (541) 485-8122 f. (541) 338-8202 > > If you have received this email and are not the intended recipient, please > delete this email. Copying or using any part, content, or attachment of > this email is strictly prohibited. > > > > On Tue, Oct 18, 2022 at 10:30 AM Kristopher Schmid via RE-wrenches < > re-wrenches@lists.re-wrenches.org> wrote: > >> Hi All, >> >> I am hoping that someone on the list can help me think this one through. >> >> I have a client that builds tiny portable homes. He is working on one >> where his client supplied the solar modules, charge controller, batteries, >> inverter, etc. They bought them through some dot com. The tiny home has a >> 240 volt mini split that they want to use when plugged into the grid. The >> inverter that they bought is a 120 volt. The inverter is not grid tied, >> but does have a 120 volt grid input for battery charging / pass thru. >> >> So, my issue is, how can I make this work? I am thinking of using a 50 >> amp automatic transfer switch like a Surge-Guard-40100 and connecting the >> solar inverter as primary and grid as backup but am not sure if that unit >> will disconnect the grid with only one leg energized. Physical space for >> components is very limited >> >> If anyone has some ideas here, I would sure appreciate it. >> (other than "just walk away" or buy a 240 volt inverter) >> >> Thanks, >> Kris >> >> >> Shine On! >> >> Kris Schmid >> Legacy Solar, LLC >> 137 West 1st Avenue >> Luck, WI 54853 >> www.legacysolar.com >> 715-653-4295 >> NABCEP Certified PV Installation Professional >> Licensed Wisconsin Master Electrician >> BSEE >> _______________________________________________ >> List sponsored by Redwood Alliance >> >> Pay optional member dues here: http://re-wrenches.org >> >> List Address: RE-wrenches@lists.re-wrenches.org >> >> 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/re-wrenches@lists.re-wrenches.org/ >> 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: RE-wrenches@lists.re-wrenches.org > > 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/re-wrenches@lists.re-wrenches.org/ > 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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