The OP is on the right track, but does not need to do anything with his OEM converter. Just use the new deck mount converter as a portable charger powered from the generator as required off grid for a fast recharge "50-90"
Make sure the gen has enough VA to run the charger. A 2000w inverter gen is about maxed out with about a 70a non-PF corrected charger. The PD 80 amper is non-PF corrected. Some say they have run an 80 amp PD with a Honda 2000. I don't know how!
I have a 3000w Honda to run my PF corrected 100 amper. I doubt a 2000w could run it at all.
Use the OEM converter when plugged in on shore power, same as always.
There are other choices besides a PD, but whatever floats your boat. I use an adjustable PowerMax on the batts in the front of the 5er when off grid.
