A few random thoughts: Not all LEDs are compatible with dimmers. To be sure, look for LEDs that say "dimmable". A battery isolator plus a B2B is redundant. They do the same thing. These days, most go with a B2B (also called a DC-DC). More of a sure thing, especially with lithium. Minimum 40A B2B for 200Ah of battery. If you have the standard 180A alternator, a 40-50A B2B is max. The optional 220A alternator can handle 60A. The dual B2B-solar controller units are quite popular, but be aware they only do one of those things at a time. That's not bad, it's just a personal choice. I went with separate B2B (Renogy) and solar controller (Bogart TM-SC) units to have max control over both processes. There are lots options. The "best" one depends on your own needs and preferences.