A basic description of how to install the real twin battery kit is provided in this video. and maybe the simplicity of it encourages someone to complete it alone.
Customer video: Generation Workz
How dual battery isolator works?
When two batteries are used together, they operate as two separate systems. The alternator and starter battery in your car work together to power the electronics while the engine is running.
Your secondary battery powers all equipment and accessories connected to your car while it is in standby mode, allowing you to use your portable refrigerator, lights, and inverters without having to keep your engine running.
This is made possible by a TrueAm dual battery isolator technology, which separates your starter battery from your secondary battery so that you can only draw electricity from one battery at a time.