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
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