Rich, this is a known flaw in the Magnum AE and PAE series. I have one longtime client for whom I supplied a 4448AE around 2009 who later told me that had he known of this frequency issue he wouldn’t have selected Magnum. Allan Sindelar
> On Apr 1, 2019, at 6:56 AM, Christopher Warfel > <cwar...@entech-engineering.com> wrote: > > I would think it has to be frequency. What else could shift the time? Up > until about 2 years ago we were a grid isolated system and no one could use a > plug in the wall clock. It takes just a very little off 60 Hz for a clock to > keep incorrect time. Being off .5 Hz will result in 42,300 cycles in one day. > When I worked in power plants the frequency was a digital display to the 6th > place I think. The operator said if that decimal place was off by more than 2 > from ISONE, it would trip off line. The steam turbines would be destroyed > otherwise. Chris > >> On 4/1/2019 7:08 AM, Rich Nicol wrote: >> Hello Wrenches >> I have a site with two PAE 48v Magnum inverters stacked. System voltage >> fluctuates ~ +/- 4 volts ranging from 243 to 247. Evenly split on the two >> lines. >> Site has a few electrical peculiarities I haven’t seen on the many other >> sites I have with Magnum inverters. Among those is three digital clocks on >> appliances that lose ~ 5 min per day consistently. A forth clock which is on >> a weather station with a transformer where it plugs into a receptacle keeps >> time and of course the computers do as they are web connected. >> I checked all neutral connections and verified proper N-G bond. >> All connections appropriately torqued. >> My recollection is the modest voltage swings are within Magnum spec. But its >> constantly moving about which seems somewhat suspect to me. >> Any suggestions? >> Thanks >> RIch >> >> >> _______________________________________________ >> 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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