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Tractor Talk Discussion Board

Re: Queston RE John T. et. al. DC vs. AC motor efficiency


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Posted by LJD on November 01, 2011 at 09:08:12 from (72.171.0.141):

In Reply to: Re: Queston RE John T. et. al. DC vs. AC motor efficiency posted by MarkB_MI on October 31, 2011 at 16:12:25:

Not trying to be "erroneous" as you claim. These small AC motors that I'm discussing do not come with posted power-factor ratings. I went to the company's specs and they rate their 1/4 and 1/3 horse AC motors as 60% efficient but give no power factor number.

I will soon do an actual amp-draw test, under load with the 1/3 horse AC and the 1/3 horse DC and see what is actually being using via a 12 volt battery. I'll have to factor in 6% loss with the AC motor since I've be using an inverter.

As to the difference in breakers when rated for AC and DC? I understand it just fine. I was making the point that it's not always easy to find switches and breakers rated for DC when wiring residential households. Again, after researching and reading the "small print" . . the only mainstream circuit breakers that are certified for DC use is Square D QO. That doesn't mean others won't work. What it does mean is you can't pass electrical inspection unless the rating exists in writing.

Also the old wall "snap switches" like most houses had in the 1950s are rated DC and AC. The newer silent switches are not.


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