I have no clue what a truck with 2-125a alternators could do. A 90a Iota seems ambitious but don't know.
Mine just has one 105a alternator, had the inverter on the battery posts with 18" 1 gauge copper, not on the alternator, and it could do about 50a worth of Vectors (900w?) before losing it at higher amps when I was trying that out. You could see the truck's voltage needle wavering, then give up and go down to the left when you maxed it out.
I think a 90a Iota needs a 20a circuit for input so not sure how you do that with an inverter receptacle set. Gotta go for that PF corrected PowerMax :) (They have PF in sizes 75a on up to 100a)
