Ive got a 3 bank MK on board and it is fine after 5 yrs no issues. I like Wards idea and the Lester portable.I run a smaller boat, so weight is an issue. Looking back now, my next boat will not have an on-board or if it goes out it will be removed in favor of a portable. Oh the “creature comforts” that it takes years to figure out (at least for me) that somethings are as good if not better when done “old school”……….96 Eyra/12 Mercury 175 Pro XS with 2015 single axle trailer2017 Victory Gunner