Hey James, Line 1 and Line 2 switched in the inverter combiner panel from any of the inverters? ( line 1 connected to line 2 of inverter 2 or 3 or vice versa)? Good luck!
Sunny Regards, Kirpal Khalsa Oregon LRT#25 Oregon Solarworks LLC www.oregonsolarworks.com 541-299-0402 On Thu, May 20, 2021 at 9:52 AM James Reismiller <ja...@abundantsolar.com> wrote: > Hi Folks, > > I’m wondering if anybody has ideas on what could be causing grid > over/undervoltage errors on an install we did about a year ago that now has > these issues. The site is a 24 kW DC ground mount array with (3) SMA > SB7.0-1SP-US-40 inverters. I’ve checked and done the following: > > 1. Measured voltage min/max at inverter terminals and AC combiner. Min > – 228VAC (with no inverter output) Max - 269 VAC (when inverter trying to > connect)! > 2. Had utility check service and transformer with load meter (with no > PV running). No issues found and utility engineer stated he thinks it’s on > our side. > 3. Checked all AC connections including neutral (seemed like neutral > issue) from inverters back to supply-side tap (fused disco). > 4. Changed SMA upper voltage window in grid guard settings to 272V max > and 264V reconnection. This helped for a while but now is faulting again. > > > > Have any of you ran into this issue and how did you solve it? Or what’s > the next thing to check? > > > > Thanks in advance! > > > > Be Well, > > James Reismiller > > He/Him/His > > NABCEP Certified Solar PV Installer® > > Abundant Solar > > 541-231-8072 xt. 3 > > CCB#175919 > > www.abundantsolar.com > <http://www.abundantsolar.com/abundantsolar/Home.html> > > > > "Don't get me wrong: I love nuclear energy! It's just that I prefer fusion > to fission. And it just so happens that there's an enormous fusion reactor > safely banked a few million miles from us. It delivers more than we could > ever use in just about 8 minutes. And it's wireless!" > > > > ~William McDonough > > > _______________________________________________ > List sponsored by Redwood Alliance > > Pay optional member dues here: http://re-wrenches.org > > 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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