Traditional alternators can be a problem.
Remember though that on our boats there is a 1:2 ratio between engine rpm and alternator rpm so when the engine is doing 1000rpm the alternator is doing 2000.
This is where alternators like Delstar and Idlepro Extreme come into their own. These are 220/250amp alternators that can deliver 80-90% of rated output @ 2000 alternator rpm.
The standard LN175 can't do that and if you increase the rpm to produce more amps it will only do it for a while before everything turns to custard.
We have big battery banks that can have very high charge acceptance rates with AGM, firefly or lithium batteries, so you need to think about these things very carefully in designing and operating a system that will achieve what you want safely.
Elyse SM 437