High performance/heavy duty alternator battery charging

It's four in parallel
But you can't force feed your batteries
Even with dual alternators you are limited to a max voltage of about 14.2 bolts at the alternator when cold
As the engine and alternator warm up , the max voltage drops to about 13.6
Amps are determine by what the batteries will accept
For dead 12vs might accept 100 amps for a short period before tapering to 65 or less and continue to taper down as they charge up and the voltage and internal battery resistance rise