just because a system has 300 amp alt and 10 battiers doesnt mean the amps going to use all that power, it only draws what it wants.
so i dont understand how going overkill on batteries can kill an amp, unless i understood what you typed wrong or read it too fast either way im not rereading it lol but
it should be the opposite, but taramps are rated 9v to 16v so really as long as your not seeing under 10 volts your solid
secondly, im legit getting the exact same amp as you bro md 8k.1 soooo
i have two 84 amp hour batteries plus the starting under the hood, and a 175 stock alternator.
i plan to run 5k full tilt for about a hour half to hour before my batteries will need recharged. or i risk running dangerously low voltage to the amp
5k watts will draw 450 amps, 0 gauge of 16 foot will not be able to transfer 450 amps so you will need a battery bank in your trunk, or two runs of 0 gauge from your front battery if you plan to be cheap, but i would buy two used batteries for 250 and call it a day. so you dont have to worry about your 600 dollar amp exploding.
8k watts will draw close to 850-900 amps, at this point you better have a high output alternator and 4 batteries of at least 100 amp hours each and thats only to play at full tilt for about 1-2 or so hours