Dual Battery: Soleniod vs Isolator

[rabbit91]

Bump!

Just bought a Perko switch and I'm going to run a marine battery as my secondary so I get the best of both worlds.

 

[BigWill2234]

A dual battery setup would work with just running them parallel right? As long as one battery doesnt go bad and drain the second?
I ask cause im wanting to do this to use a high amp 2500 watt inverter without having the car running at all times. I figured a dual battery setup would allow this without much of a voltage drop with two batteries since the inverter has a low voltage cutoff and i can only draw about 1700 watts when the vehicle isnt running.