Jeff, I suggest high AC volts is the issues. The second inverter may not have the same settings as the first. The voltage is already being pushed up by the first inverter, maybe the second one is adjusted a little tighter. The SMA config tool can show the settings.
Thank you, Maverick Maverick Brown BSEET, NABCEP Certified Solar PV Installer ® President & CEO Maverick Solar Enterprises, Inc. Office: 512-919-4493 Cell: 512-460-9825 Sent from my HondaJet! On Oct 24, 2011, at 8:10 AM, "Jeff Yago" <jry...@dtisolar.com> wrote: > We have installed many Sunny Boy grid tie inverters in all size ranges with > no problems until this head scratcher. For this client we installed a 4 kW > grid tie system 2 years ago that included a 4 kW Sunny Boy inverter. At the > time we anticipated this client would want to upsize the ground mounted > array located about 180 feet from his home that was all landscaped, so we > installed an empty conduit with the required conduit when we dug the trench. > A few dollars of PVC might come in handy later. > > This system has worked perfectly for 2 years. Almost a year ago we were > called back to install the second system, which was an exact duplicate of > the first. Same modules, just lengthened the racking so same orientation, > same model inverter, same wire size using the empty conduit we left the > first time, and supplying the same breaker panel. Starting several months > ago the second Sunny Boy inverter has started to go off line for no known > reason. The first inverter right beside it is "seeing" the same grid, yet > it is not having this problem. > > We suspected the added circuit breaker was flaky and replaced it but this > did not resolve. The error message always indicates no grid AC. This last > time the inverter was off line for 2 days then came on by itself again and > is now working just fine. During all this the first inverter worked > perfectly. After 3 trips to check out and finding nothing out of place, is > it time to send this one back to the factory? > > Jeff Yago > > > _______________________________________________ > List sponsored by Home Power magazine > > List Address: RE-wrenches@lists.re-wrenches.org > > Options & settings: > http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org > > List-Archive: > http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org > > List rules & etiquette: > www.re-wrenches.org/etiquette.htm > > Check out participant bios: > www.members.re-wrenches.org > _______________________________________________ List sponsored by Home Power magazine List Address: RE-wrenches@lists.re-wrenches.org Options & settings: http://lists.re-wrenches.org/options.cgi/re-wrenches-re-wrenches.org List-Archive: http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org List rules & etiquette: www.re-wrenches.org/etiquette.htm Check out participant bios: www.members.re-wrenches.org
