Wish I could give you an exact answer JD as youre always so helpful to others, but absent any DETAILED Generator specs IM JUST NOT SURE HOW TO CALCULATE ITS MAXIMUM (its more a mechanical/thermo heat dissipation and insulation problem concerning the fields).
As Im sure youre aware, the more current pumped through its field OR the faster it rotates, the more voltage it can generate. BUT the big limiting factor (which we just dont know) is the max field current the windings can withstand without overheating or degrading the insulation. Of course, the other limiting factor is the current the stator/armature can safely supply.
As far as the regulation, I guess its some sort of pulse width modulation (like when a VR relay chatters) be it solid state or mechanical cycling??? If its solid state it gets complicated to change SCR type of cycling, if its mechanical we may be able to tweak it up. BUT THE BOTOTM LINE REMAINS HOW MUCH CONTINUOUS FIELD CURRENT WILL THE GENSET WITHSTAND. If you full field it she may well produce the desired output BUT WILL THE FIELDS OVERHEAT????
If we increased the field current BEYOND what regulation adjustment you mentioned by say 10% more, my guess is theres enough safety over rating the fields would withstand it.
Think you can get a field current rating when shes set at the max the controller allows??? That may provide some insight but the problem is that may be cycled pulse width modulated in such a manner the ammeter may not give an accurate response.
Maybe this is food for thought, maybe its no use whatsoever, but unless we know the duty/regulation cycle and/or max field current how we gonna figure how much we can increase it so she dont melt down???????
I havent seen my old buddy Dr Gerald Johnson here forever, he still practices engineering and is a whiz on DC Motor/Generator theory, Im sure he could help
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