Posted by KEB1 on April 19, 2011 at 10:38:41 from (192.91.171.36):
In Reply to: Figuring watt draw?? posted by dave2 on April 19, 2011 at 03:26:42:
Dave,
Without getting into a long involved discussion of power factor, apparent power, real power, reactive power, etc., etc., there's a simple approach.
What mostly drives wire and core size in a tranformer is the current through the windings, not power. This is why most transformers are actually rated in volt-amperes rather than watts.
Therefore, if you know the current (amperes) draw of the loads you want to use, any transformer that has the right output voltage and an output current rating equal to or greater than the current draw of the biggest load (or combination of loads) will work. In this case, worrying about watts just confuses the issue.
If all you have are watt requirements for the loads and a watt rating for the transformer, then buy a transformer that's 50% or so bigger than the watt requirements and you'll be covered for any additional current requirements associated with reactive loads.
There are a number of other possible permutations, but this should cover the vast majority of situations you may encounter.
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