Auxiliary battery setup

[Birdybird]

Hey guys
I’m wanting to setup an aux battery in my 06 5.9 to basically run an inverter and possibly some lights in a truck cap. I know I’ll need an isolator but that’s about all I know.
Can anyone help out with this?
Thanks.

 

[H3LZSN1P3R]

Just need to run some big enough cables 2AWG or 4AWG depending what the use will be on the inverter should do it and your isolator thats all you need really