I have a couple of EPever SCCs. they are rock solid. The BN is their top of the line and all are programmable for any lithium config you need. The BN is heavy duty with heat sinks and cast aluminium case. The AN seems to be light weight by comparison, but still up to the task. if you are not trying to tax everything you can get out of your supply. these are lower cost and close to "bullet proof".
Victron has a low temp monitor that works great, but those are triple the price while a heater is much less for a high energy system (a minor tax for low temp operation). I have a small Tesla powered system they charge, and it is" Overkill", but --- I feel pretty good with them.
I may be wrong, but I do not think we have to have the "cutting edge" to put a solar collection system together.
Sorry if I have offended anybody.
I just joined the diysolarforum last week and am about to purchase either the Tracer 4215BN or Tracer 4210AN.
(Although I am still considering a more expensive Victron)
I plan on putting the battery bank and controller in a tight closed space with the existing OEM converter in my teardrop trailer and am worried about heat buildup.
The 4215BN has almost identical spec as the 4210AN with the exception of the rated voltage (150 vs 100) and physical construction.
The 4215BN is a common negative design not a positive one as someone mistakenly reported. I believe an older version was common positive but
the newer model(s) are negative. (See attached datasheets) The BN is also slightly larger than the AN (12" vs 10"), but width and depth are virtually the same.
The BN is all aluminum with (I'm guessing) a better heat sink design as someone mentioned.
The BN is $50 more on Amazon ($198 vs $148) with the MT-50 kit.
Plus an extra $25 for the Bluetooth dongle.
As of now I'm leaning toward the 4215 BN for heat dissipation reasons and will probably spent the extra $50 and buy it this week.