Prior to the National Meet I wanted to have the security of a reserve battery so I did a temporary fit in a container in the tub.
With the main component being a Ctek D250S DC-DC charger, so I didn't need to be concerned with voltage drop & a partly charged battery.
I also wanted accessory sockets to cover most applications IE Anderson plug, cig lighter socket & Merrit socket.
These all needed to be fused & a 100A main circuit breaker to shut off all power in a fault situation or emergency.
I also wanted to be able to feed current back to the main battery as a short term boost in case of an almost flat starter battery, for this I used a Blue Sea rotary battery isolator. This way I can isolate power to the Ctek & eliminate the possibility of the current cycling through the charger.
A volt gauge was also fitted so I can see charge condition at a glance.
The cable coming from the battery is in flexible condute attached to the upper side of the chassis with cable ties. It is fused at the starter battery with a sealed large type fuse (don't remember the rating), this way if the cable is damaged it is protected at both ends. I fed this up to the tub via the left hand tail light recess.
I will be fitting this permanently behind the rear seat as soon as I get a chance (minus the plastic container) similar the the way Kegsy has done his setup
see hereIt is always a good idea to have some instructions on how to shut off power, in case of emergency. This is just a laminated printed page.