"I'll bet you're missing my whole point by getting hung up on/with the old genney I have."
You just lost even more money, making such a bet.
I'm not hung up on your gennie, i'm hung up on the fact you think your current set-up can stand its ground against an eu2000i and a 45a charger. :( And you appear to believe you're actually saving money by using your current set-up?
- - - If there was an icon for a long bearded guy sitting in front of his computer screen, shaking his head in bewilderment, it would be inserted here - - -
Yes, when comparing the two, it's a complete wash! Your set up doesn't even come close to being as efficient a charging set-up. Does it meet your needs? Sure. But so would a bicycle mounted on a stand, belted to an old alternator/generator. All you'd have to do then is pedal the bike 24/7. And if you got everything for free, even better, right?
Bottom line, it's good money chasing bad, if you invest any money into repairing that gennie and then continue using it as you do. It would be like repairing an old 65% eff furnace, instead of replacing it with a 90% eff, just because the old furnace came with the house. "Sure, it uses more than twice the hydro to run, but hey, it was free with the house" (of course, the house would have sold for the same price without a furnace, right?)
It's a simple case of PAY me now, or PAY me more later. And that 15 amper was included in the overall price of the rv, so it was not free. Or would you pay the same price for an rv without a 12v charging system?
Imagine, someone walks into a furniture store, buys a living room set for $1200, and puts it on credit. They then take it home and tell their friends "hey, it didn't cost me a dime!" Of course, at $60 a month payments for the next two years, it ends up costing them $1440. Or better yet, imagine some one saying "hey i was just given a $3000 car for free!... of course it's gonna cost me $5000 to put it on the road, and it'll still only be a $3000 car... but hey, I just got a $3000 car for free!" :(
At no time have I suggested you get rid of that gennie; although you really should :)... but I am attempting to show you your choices of charger / charging routines are extremely limited by using it along with that 13.8v, 15a converter. What you need more than anything is a better charger. For example, you can pick up a mean well nes-350-15, 13.5-18v, 23a charger for less than $50, and it would pay for itself in no time flat. But even that wouldn't work for you, seeing as it draws 7a. So you see? That gennie is limiting your choices immensely, and ultimately costing you more in the long run.
Do what you will, but kindly refrain from insisting your current set-up stands up to a much more efficient one; or that it has some kinda "edge" over an eu2000i coupled with an adjustable voltage, high amp charger, ... or expect to be challenged on such an unsubstantiated, easily dis-proven assertion. And you don't need a quiet "AT FULL" generator, just one that can handle more than a measly 4a load. Yeah sure, the used ex650 is quiet and inexpensive, but so is my AA/AAA battery charger. hmmm, Maybe I should just hook that up to my 215Ah bank and call it a day?