Skismuggs- That's perfect, but as you noted there is no fuse inline like the one that came with the kit. I'm going to cut off the alligator clips and solder on 10 gauge eye loops. Then mount in outside the battery box and get a dust cover.
I'm still researching in how to attach the added 50 watt panel. Works out almost the same $150 either buying a bundle kit and adding cable from the controller to the battery or adding it in parallel with MC4's and branch connectors. With the bundle, I will have a 20 or 30 amp controller to expand further.