Author Topic: AC vs DC amps  (Read 837 times)

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ChrisOlson

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AC vs DC amps
« on: April 03, 2010, 06:59:17 AM »
......and I found out, sampling one leg, that I get more DC amps (out of all three rectifiers) than I get sampling that one leg on AC.  It's a little hard to get exact numbers because the meter keeps varying slightly, but this is an approximation.


Why is this?  I always assumed this was a one-to-one ratio.


Using the conventional method of measuring power output from a three phase generator, I'm seeing a "clamp" voltage of ~10.8 VAC between any two legs, and using my example of ~3.5 amps, this generator is putting out 37.8 watts.  On any diesel-driven three-phase generator this is what it would be - RMS volts x amps = watts.


However, looking at the actual DC output going to the battery I'm seeing a "clamp" voltage of ~14 VDC and ~10 amps = ~140 watts.


Who ever can explain this to me wins the prize.  I don't know what the prize is, but they win it.


This was supposed to go in Wind and I posted it to Newbies by accident, so reposting it here.  Tom or somebody, if you could do me a favor and remove that posting from the Newbies section.....

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Chris

« Last Edit: April 03, 2010, 06:59:17 AM by (unknown) »

Flux

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Re: AC vs DC amps
« Reply #1 on: April 03, 2010, 07:17:16 AM »
I replied to the newbie section, i hope you find it before it gets deleted.


Flux

« Last Edit: April 03, 2010, 07:17:16 AM by Flux »