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This is our Victron 100/30 MPPT Charge Controller, below it is a 30amp fuse which I also use as a switch. I believe I need to replace this with a 40amp fuse. I havent seen any problems, but I read that it should be 40amp minimum. Below that is the shunt for the Victron BMV-712 battery monitor, and the monitor itself is found just below and to the right of the fuel guage. I mounted this out of sight, since the module is Bluetooth and I can see the data from my phone. There is also a negative bus bar. Great for organizing all of the wires. I decided not to install a positive bus bar, as the West Marine 105amph AGM batteries have two lugs. It is recommended not to have more than four lugs on any post, and I managed to keep it below that limit by using the screw terminal for the main large gage cables and a clamp on the other lug. Our house bank is now 210amph AGM Sealed Lead Acid. Contemplating LifePo4, but the prices need to come down first.