Kinetik battery question

I'm running (1) hc1800 and possibly (2) hc600

reason for the hc600 is for space, not much room in the trunk of the 1997-2001 q45.

What else do I need for the set up

would a kinetik power supply be neccesary and if so at what amp 45, 60, or 80


(2) 750/1 (500max) to each sub (1) 600/4  (400max) to 2 sets of components

over all additional 1400 watts

That's plenty of battery power for the amps. I'm guessing the 1800 is under the hood? If so, make a run for both positive and negative (better ground than just the chassis) and run it to the positive and negative of one of the other batteries, then from that battery to the 3rd. You could do 2 runs from the 1800 that go to each of the 600's but that's not really necessary for your setup and will cost you more.