BFL13 wrote:
When comparing AH counts, the OP says "ignoring efficiency losses" but if the AH count comes from a Trimetric, then that would include the Trimetric's 4% allowance for such losses. So you have to know how the two graphs were "built."
The ugly graph here is what Mex wants to see, but it is not Iota vs PD. It is Vector vs Mod-PM3 vs Standard PM3 (Vector won, but later I upped the Mod-PM3 from 14.6 to 14.8 so now it is a tie)

And your mod confirms that for bulk charging, higher voltage, to a point, shortens the generator time. It's not so much the charger as it is the battery chemistry that places the limits on amperage accepted. Charging 50% to 80%, the battery will take what you throw at it, without generating too much heat. Once past 80%, when things can gently bubble, not boil, is when they seem to drop the voltage.
If you run your genny an hour in the morning, and an hour in the evening, the Iota will serve you well, judging by what's on the graph. Those few extra 1/10ths of a volt make a difference.