Here is my install (pre wiring shield):
I went with the IBS dual battery system with the option RBM (Relay Booster Module) to replace my problematic National Luna
Here you can see the control unit. It is slightly larger than the NL, but has all electronics in the cab, unlike the NL which has it mounted above the solenoid. This makes this unit much more water resistant than the NL kit.
The solenoid itself is much smaller in comparison and sound wise much quieter when linking or disconnecting the batteries. When I h ad the surepower solenoid it would trigger the glass break sensor on the alarm, as would the NL. This unit does not trigger the glass break sensor with the solenoid mounted directly to the firewall.
It's hard to tell here, but everything is sealed, keeping water and dust out.
The harness was a breeze to set up, simply 4 wires through the firewall and connect per the instructional diagram. In my case since I was installing the RBM, the diagram I had to follow was the one included in the RBM package.
Again fully sealed!!!
Controller mounted using a swivel base mount:
Under the hood, Still need to add wiring looms before too much driving.