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"Spinning big alternators is "work" don't do this at or barely above idle."
Only if they are under load, doing charging. Most alternators will hardly put out any power (and consequently develop next to no load) at idle RPMs.
On the bright side...you can solve the problem of not putting a load on your engine AT idle speed, if your alternator system is set up so it DOES put on that heavy load.<G> And you won't be able to run at that low idle speed if the load really is "heavy".<G>
I've literally seen a small (80A rated) alternator buck and kick the belt off the pulley when it was running at low speed, charging one battery, and the battery switch was thrown to "BOTH" bringing the load of the second discharged battery online. (Both the alternator & the battery switch on that boat are safe for switching while in use, not all are.)
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