Dave, Sorry, misspeak on my part. It is DC negatives and grounds that are tied together. No neutrals in the DC box. Cheers, Dave
*Dave Tedeyan, PE* Senior Engineer | Taitem Engineering, PC 110 South Albany Street | Ithaca, NY 14850 o. *607.277.1118 x121* f. 607.277.2119 www.taitem.com Solar • Sustainability • Energy • Design Certified B-Corporation since 2013 On Fri, Dec 20, 2019 at 12:57 PM Dave Angelini Offgrid Solar < offgridso...@sti.net> wrote: > Why would neutral be in the DC conduit box? This just wrong but I doubt > this is the problem. > > Since this never worked properly or has not in 13 years, I would suggest > replacement with modern equipment. SW from xantrex has been out of support > for around 15 years and always was a headache grid tied, in my opinion. > > *Dave Angelini Offgrid Solar > "we go where powerlines don't" > http://members.sti.net/offgridsolar/ <http://members.sti.net/offgridsolar/> > e-mail offgridso...@sti.net <offgridso...@sti.net> > text 209 813 0060* > > On Fri, 20 Dec 2019 12:44:42 -0500, Dave Tedeyan <dtede...@taitem.com> > wrote: > > Hi All, > > I am someone's last ditch effort to get their system working which has > been non-functional since a few months after installation, 13 years ago... > > After getting some new batteries in there, I can at least fire it up. It > is a grid tie with battery backup situation with two Xantrex SW4048 > inverters. Each inverter is kind of like its own system with two Outback > MX60 CC's per inverter, and each inverter powers its own 120V backed up > loads panel. They do not see each other until their 60A single pole > breakers in the main panel. > > What seems to be happening is that after turning on the inverters the AC1 > in good light will flash for about 30 seconds, then it syncs up to the grid > and the light stays on solid. But then after a little bit, that light will > start flashing, indicating that the utility power has been dropped, when it > has not actually been dropped. Then at some point the backed up loads would > lose power. The customer says that every 1-10 minutes, they would lose the > backed up loads for 10-90 seconds. This happened all night long until they > bypassed the inverters. > > There are a few other things of note: > 1. There is a Xantrex GTI for each inverter. > 2. I see in the manual there is information about stacking the inverters, > but I am guessing in this setup this not necessary or would even be counter > productive to stack the inverters. Not sure if the inverters not being > stacked could cause one of them to unsync with the utility? > 3. Neutrals and grounds are bonded in their main panel, but also in each > of the Xantrex DC breaker boxes. I was going to separate them in the DC > breaker boxes, but found that there is no way to isolate the battery > negative bus from the box itself, and figured it would be dodgy to unground > the enclosure. So I am also not sure if the multiple N-G bonds could be > causing these issues. > > Does anyone have any ideas? > Cheers, > Dave > > *Dave Tedeyan, PE* > Senior Engineer | Taitem Engineering, PC > > 110 South Albany Street | Ithaca, NY 14850 > o. 607.277.1118 x121 f. 607.277.2119 > www.taitem.com > > Solar • Sustainability • Energy • Design > Certified B-Corporation since 2013 > > -- > > > > > > _______________________________________________ > 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 > >
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