Using 100 amp mopar alternator to charge batteries out of a vehicle

Back when Mopar had a 100 amp optional alternator, there was a voltage regulator (p/n 3755850) specifically for 100 amp alts. Now that you can no longer get these regulators from a dealer and everything is one size fits all ching chang crap, how well something works is just a gamble. Unless it's a cop car restoration, I replace these alternators with a later model.
You didn't say which alternator you are using. Since this is a home power unit and not a car, why not just go with a later model alt such as a Delco Remy CS-144. The junkyards are full of them and they are cheap much more powerful and reliable and if it dies just go get another one.