Hi Marco, SMA may have a solutions for this called the PV offset box. I think it would allow the negative ground without the degradation.
http://files.sma.de/dl/15437/PVOFFSETBOX-DEN1444-V10web.pdf I have never used this but thought it was an interesting product. On Sat, Aug 11, 2018 at 2:29 PM Marco Mangelsdorf <ma...@pvthawaii.com> wrote: > Hi Jerry, > > I'm talking about the need to ground one of the current carrying > conductors back to earth, not the metal equipment frame. > > The SunPower pre-Maxeon cells required that the positive conductor be > grounded. Which is not possible with TL inverters. > > There's no safety issue to let these older SPR arrays float. But the so > called surface polarization effect equals an output loss of 25 or more > percent. > > As transformer based inverters fail, us SunPower dealers will be in more > and more of a pinch. > > marco > > On Friday, August 10, 2018, Jerry Shafer <jerrysgarag...@gmail.com> wrote: > >> Marco >> Am I missing something, all arrays are grounded even in Hawaii, I have >> systems using the SMA Tripowers and ABB Trios, they are required to be >> grounded and tested as so. Now if the modules "Leak" this can cause >> resistance leaks in the array, its like a GFI. I have had issues with >> inverters in Hawaii along with other areas tripping out due to low >> resistance to earth, it can be the backing leaking, also from the edge of >> the module. SunPower Modules are still grounded just on the other side. >> Jerry >> >> On Thu, Aug 9, 2018 at 3:15 PM, Marco Mangelsdorf <ma...@pvthawaii.com> >> wrote: >> >>> Hi all, >>> >>> >>> >>> I’m in need of a vintage Xantrex 30 kW (PV 30208) inverter. >>> >>> >>> >>> Anyone happen to have one or know of someone who might? >>> >>> >>> >>> Can’t use a TL because the array needs to be grounded. >>> >>> >>> >>> Mahalo, >>> >>> marco >>> >>> >>> >>> >>> <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_-328387555879471101_m_-8959875205440361245_m_2606966111131649740_DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2> >>> >>> _______________________________________________ >>> 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 >>> >>> List-Archive: >>> http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html >>> >>> List rules & etiquette: >>> www.re-wrenches.org/etiquette.htm >>> >>> Check out or update participant bios: >>> www.members.re-wrenches.org >>> >>> >>> >> _______________________________________________ > 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 > > List-Archive: > http://www.mail-archive.com/re-wrenches@lists.re-wrenches.org/maillist.html > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out or update participant bios: > www.members.re-wrenches.org > > -- Mac Lewis *"Yo solo sé que no sé nada." -Sócrates*
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