John M - Usually a "self exciter" is a standard 3-wire 10SI alternator retrofitted with a different internal regulator to render it self-exciting.
As the others point out, most self exciters need to be spun up to a considerably higher RPM before they'll begin to charge. (However once they start charging they'll continue to charge atlow RPMs same as a 3 wire unit.) There are however "low cut-in" self-exciting units out there - but I've had no experience with them.
Also all self-exciters I've seen pull a small amount of current (on the order of milliamps) when shut down. Generally this leakage current is not a problem - it's usually less than a good battery's self discharge rate.
However I've run across a couple self-exciters that drew so much standby current they would flatten a fully-charged battery in a matter of a week or so.
I'm not particularly fond of self exciting alternators myself....
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