the first limitation you may run into is likely driven by your generator.
A 2000W generator will run a 60A PD fine, 75A or bigger is a possible issue with a generator overload at full current. The PD units have a bad power factor and draw more current than you calculate from the watts rating. A 100A is definitely a no no with a 2000W generator.
If you have a 1000W or so generator stay with the 45A.
A 3000W or so generator, no issues.
I have 4 GC batteries and what I did was replace the WFCO with a 55A PD unit and added a 75A PD deck mount in the pass through and wired it off a seperate breaker.
So.... when boondocking with one honda 2000 I use the 55A to charge, if I happen to have the honda 2000's paralleled I turn both on and get about 120A into the bank when deep discharged. speeds up the charging to 80% or so.
