Ok i posted in the wrong section a few minutes ago and i appologise. But my question. and ive read them all on here,but still not quite understanding as to they are a bit different from my question. I have 3 batteries on my boat. 2 12v's wired to 24v Trolling motor alone. Then my starting battery with bilge pump lights wired to it. I am going to purchase an onboard charger. But im not electronically inlcined whatsoever. So im assuming 1,2,3 bank is meaning a battery=bank. Correct me if im wrong, But if im wanting to charge the 2 12'vs for trolling motor would that be conscidered 1 or 2 banks assuming my theory is correct. Also if its 2 banks for 2 12vs that are connected. Im only assuming id need 3 banks to charge all 3 batteries. Any help or insight on this would be greatly appreciated. Im sure if anyone can shed some light on this i can buy one and go by the instructions on how to wire it. Im just illeterate to anything without instructions lol. Thanks a ton, Jerry