I have a similar issue.... I have a Trace 4024 inverter and battery bank. The Trace 4024 has a built-in battery charger that is capable of throwing a 30 amp charge into the batteries. (which is what I want to charge the batteries as quickly as possible when using my diesel generator) The utility power comes in to the main panel box, which goes to a sub-panel box, and from there to the Trace 4024.
The Trace 4024 can only handle 120 volts going in. My 12.5 KW Isuzu diesel generator puts-out 100 amps @ 120v / 50 amps @ 220v. I need 30 amps for the charger, and at least another 10 amps to run the house while the batteries charge.
I wired the 120v from the generator to a 100 amp breaker in a panel box. I have a 60 amp breaker in the box that is wired to the Trace 4024. From what I gather, it is not "balanced" running the generator this way, but it has worked well so far.
(I do have the generator head grounded to an 8ft copper grounding rod with # 6 copper grounding wire. (not spliced) )
I found a transformer here:
http://www.surpluscenter.com/item.asp?UID=2006112720341102&item=15-1161&catname=electric, but I am not sure of how many amps it is rated for. If it is the 25 amps that I have seen on other transformers, it would not do much good in my case.
Any input would be appreciated...