Congrats on the new Scamp!
I installed the Trimetric in my 16' side dinette just to the left of the galley sink at about eye level. It is mounted on the fiberglass side wall. The wires were pulled through the refer cavity from below the floor. As I remember I purchased a 6 conductor, 3 twisted pair wire that handled all the needs. I mounted the shunt on the inside of the tongue frame on the curb side near the battery
. I didn't use a WP box, which is a mistake. The elements can cause corrosion. I am in the process of re-installing the shunt. Vent holes in the bottom of the box may be a good idea, but I have not figured out a way to let the hot air out of the top without allowing rain into the box. Comments to follow on how to do that from our creative FGRV mind pool.
Just some thoughts on the Trimetric:
It is a fun tool to give an RVer an idea about power usage for various electrical
It counts the amp hour draw and calculates remaining battery
capacity, which gives the user peace of mind in knowing about how much reserve power remains.
It tells how much current is flowing and what direction. IE are we charging or discharging and how much.
I feel the mounting location should be in a conspicuous space where you can view it at any time. If you have to hide it, no problem. Mount it where the installation makes sense.