Hi All, So I went back today and updated all the programming. There was actually lots of sun too (a rare event in upstate NY this time of year)!
The inverters have not yet had any issues with powering the backed up loads so far. But there have been issues with selling back to the grid. One inverter was selling just fine, with the sell current right around the max sell setting. The other inverter would very quickly ramp up its sell and go way past the setting (set at 30A) and start selling at up to about 60A, and then would stop selling (but continue to power the backed up loads. When selling, the AC1 in good light would stay on green solid. Then when the one inverter would stop selling, that light would flash. Then 5 minutes or so later, it would click a bunch of times, start selling, and within about 10 seconds overshoot the setting again and kick off. I tried Tumps suggestion of removing the black jumper. When I did that in each inverter, neither one would sell, but they would continue to power the backed up loads. I also tried bypassing the GTI on the inverter that was having selling issues. When I did that, the AC1 in good light never came on at all, even though I verified AC voltage on the input. It never started selling, but it would at least continue to power the backed up loads. I only had it like this for about 15 minutes before I had to leave the site, so will be checking in on the system in the coming days. Last time I was there and fired it up, it worked fine to begin with and it was not until many hours later that the issues with powering the backed up loads started appearing. 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 Sun, Dec 22, 2019 at 5:11 PM b...@midnitesolar.com <b...@midnitesolar.com> wrote: > > Forgot to say that if the inverters ARE grid tied, then they will NOT > drift around in phase and will > > be synchronized and therefore will stay in sync and be passing through > from grid to output. > > boB > > > > On 12/22/2019 12:57 AM, Jerry Shafer wrote: > > Well l would start simple and get a sync cable and make sure that they are > al least staying g in correct phasing, then look closely at the > programming, look at the grid voltages and settings, take it out of IEEE > for test purposes only, you might find out you have a board that's out of > calibration causing the issue but start simple > Jerry > > On Fri, Dec 20, 2019, 9:44 AM 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 >> >> > _______________________________________________ > 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 > >
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