William Double check your voltage drop on the AC branch circuits, and make sure that you consider your wiring between inverters. Remember that voltage drop is additive and each inverter will see a slightly lower voltage drop which could account for the voltage over error, especially if you are seeing it at the end of the string. Enphase does have a white paper on that and they are now recommending splitting long strings int he middle to make to branch circuits out of one now to alleviate this problem. The White Paper explains this in more detail. There was also a Solar Pro article describing how voltage drop can result in voltage rise at the inverter, and I have seen and measured this with a meter. Maybe the inverters are correctly reporting the voltage rise?
Bill On Mon, Nov 26, 2012 at 12:46 PM, William Miller <will...@millersolar.com>wrote: > Friends: > > We have one site that is experiencing ongoing problems with errors > indicating, "AC Voltage Out Of Range." This has occurred on two of 17 M190 > inverters. Apparently the voltage is not really out of range, the inverter > is erroneously reporting. > > I have one replacement in hand and was just about to drive the 2 hours to > replace it when another inverter indicated the same problem. I ordered a > second replacement. > > I fear that soon after I return to my shop from the job I will see another > inverter with this problem. Has anyone else experienced this error? > > Thanks in advance, > > William > > Miller Solar > Voice :805-438-5600 > email: will...@millersolar.com > http://millersolar.com > License No. C-10-773985 > > ______________________________**_________________ > List sponsored by Home Power magazine > > List Address: > re-wrenc...@lists.re-wrenches.**org<RE-wrenches@lists.re-wrenches.org> > > Options & settings: > http://lists.re-wrenches.org/**options.cgi/re-wrenches-re-**wrenches.org<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<http://lists.re-wrenches.org/pipermail/re-wrenches-re-wrenches.org> > > List rules & etiquette: > www.re-wrenches.org/etiquette.**htm<http://www.re-wrenches.org/etiquette.htm> > > Check out participant bios: > www.members.re-wrenches.org > > -- Bill Hoffer PE NABCEP Certified Solar PV Installer™ Sunergy Engineering Services PLLC 2504 Columbia Ave NW East Wenatchee WA 98802-3941 bhof...@sunergyengineeringservices.com Cell:(509)679-6165
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