Bill, Watch out for the 480 delta with the SMA inverter. Even though the product literature says it works, it doesn't. If there's ever a ground fault (PV system or customer facility wiring) on one of the 480 legs, the other two legs will jump to 480V to ground (with much higher spikes along the way) and blow up the varistors on the inverter output stage which are not rated for this condition. We learned this the hard way with 10 out of 24 inverters suffering complete failures on one project shortly after they were installed. We're talking catastrophic component failure with bits of varistor all over the inverter boards and adjacent components scorched. In the end, we installed a 750kVA 480 wye to 480 delta isolation transformer to provide a reliable ground reference for the inverters. In the process of solving this problem, we learned of several other sites with the same issue...
Best, Blake Sun Light & Power On Thu, Apr 18, 2019 at 3:44 PM frenergy <[email protected]> wrote: > Wrenches, > > I'm tackling a huge residential system that requires > back-feeding the grid at 480 volts, delta (no neutral, right?). We're going > to GT 30-50 KW. The SMA SB30000TL-US-10 is one of the few inverters > (apparently) that can do this, which I'm planning to use. The inverter can > be fed up to 1,000 vdc,OC. 1,000 volt array is new to me. I assume they > have to accept the high voltage because its a 30K inverter with only 2 MPPT > strings. My question: Other than not getting fried during installation, > what's different about wiring the array or anything else on the DC side? I > don't see anything in our current (2014) code cycle on this that's > different than 600 volt. Tips, advice? > > Any links, past webinars, whatever else also helpful would be > welcome. > > Thanks, > > Bill > On 4/18/2019 2:32 PM, Starlight Solar Power Systems wrote: > > Hi Chris, > > SWRC is the remote part name. SW-4024 is the inverter/charge. > I believe all the Trace products from that era use the same BTS with RJ11 > plug so that should not be a problem. > > Larry > > > On Apr 18, 2019, at 10:33 AM, [email protected] > <[email protected]> wrote: > > Hi Folks: > > Does anyone have a line on a remote option and battery temp sensor for a > SW-RC4024 (in a customer’s motor coach)? If so, please contact me off > list. Thanks. > > Sincerely, > > Chris Daum > Oasis Montana Inc. > 406-777-4309 > 406-777-4309 fax > *www.oasismontana.com <http://www.oasismontana.com/>* > > > > > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: [email protected] > > Change listserver email address & > settings:http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/[email protected]/maillist.html > > List rules & etiquette:www.re-wrenches.org/etiquette.htm > > Check out or update participant bios:www.members.re-wrenches.org > > -- > Feather River Solar Electric > Bill Battagin, Owner > 4291 Nelson St. > Taylorsville, CA 95983 > 530.284.7849 > CA Lic 874049www.frenergy.net > > > > <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient&utm_term=icon> > Virus-free. > www.avast.com > <https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=emailclient&utm_term=link> > <#m_5858696282563267430_m_3869699995280723071_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> > _______________________________________________ > List sponsored by Redwood Alliance > > List Address: [email protected] > > Change listserver email address & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://www.mail-archive.com/[email protected]/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > > -- *Blake Gleason, PE* | Employee-Owner | *Director of Innovation & Technical Excellence* 510.845.2997 x128 Follow us on Facebook <https://www.facebook.com/pages/Sun-Light-Power/119675658118322?ref=hl>, LinkedIn <https://www.linkedin.com/company/sun-light-and-power> or our website <https://sunlightandpower.com/>.
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