[RE-wrenches] Magnum Inverters - Digital Clocks Losing Time?

[Christopher Warfel]

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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