I see lots of threads about dual batteries, but is there really anything wrong with just having 2 batteries connected to a 1/2/both/off switch and nothing else? No isolator or breakers or anything like that.
I know that would mean its all manually switched but thats how it is on my boat and it works ok.
Would also serve as kind of a security feature if you could hide the switch.
If I dont care about it being all manual, is there really anything wrong with this setup?