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For a start it depends on what you really want for a system... do you just want a basic system that just keeps 2 batteries going or do you want something a bit smarter or do you want top of the line??
It is really pretty simple set up for the most part and with advice from some of our gurus you should breeze it in......
What car do you have for a start is a help to work out what battery you can fit plus if it is a late model then you probably have to go with a smarter dual system?
Yendor or Benny or the like can help just give a bit more information mate..