Chris; Of course as Kent points out, the equipment does not appear to be UL listed, so would not pass inspection. But, I realize there are situations where a UL listing is not required. It appears to me that the Growatt/Huawei setup this person bought is very similar to the architecture of the SolarEdge StorEdge solution. It uses an autotransformer in exactly the same way, to split 240VAC output into a pair of 120VAC legs, but the SE AT is only needed when powering household loads from only the battery bank.
In a purely off-grid situation, of course this would be all the time. But autotransformers are certainly more efficient than dual winding transformers, and I think the In/Out voltage ratio would be low if the secondary is simply dual tapped....but that is WAY beyond my pay grade. Perhaps you can glean some efficiency info from the StorEdge documentation, or even better, from one of the power electronics experts here. All in all, though, a great example of how NOT to design an off grid system, as you've likely already informed the potential client! Dan Fink Owner, Buckville Energy Consulting LLC NABCEP Certified PV System Inspector NABCEP PV Associate NABCEP Registered Continuing Education Providers d <dan.f...@greendustrialtraining.com>anbo...@gmail.com 970-672-4342 On Mon, Jan 4, 2021 at 4:33 PM Chris Schaefer <ch...@solarandwindfx.com> wrote: > G'Day and Happy New Year's All, > > Just wanted to share this with you all. A potential client purchased a > somewhat complete system off the internet and is now seeking an installer. > I know, same old story. The package came with two Growatt SPF-5000 ES > inverters with two Huawei HW-TX-5000 transformers. The twist to the story > is apparently the inverters put out 230vac on a single leg and the > transformers are required to split the 240vac into two legs of 120. I've > never come across an inverter like this. As an off gridder the first thing > I think of is the inefficiencies of the additional transformers to do > something like this when we have plenty of manufacturers that don't require > this. I'd love to hear your thoughts on this setup and possible experiences > and pitfalls to beware of. > > PS the client is kicking themselves in the butt, lol. > > Gratefully, > Christopher-- > > Chris Schaefer’s > <http:www.solarandwindfx.com> > > *Tel/Fax 585-229-2083 or Cell 585-748-1870 * > *5115 South Hill Road ~ Canandaigua New York 14424**www.solarandwindfx.com > <http://www.solarandwindfx.com> ~ E-mail: ch...@solarandwindfx.com > <ch...@solarandwindfx.com>* > > > Thomas Jefferson, the author of our great Constitution, once said, > "democracy" will cease to exist when you take away from those who are > willing to work and give to those who would not." > _______________________________________________ > List sponsored by Redwood Alliance > > 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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