need help buying the "right sized" onboard charger

[keakar]

thanks, i'll go ahead and order the 20 amp 10/10 one then. I was pretty sure that's what I needed but I guess I just wanted reassurance before spending the money.

I don't need a 3 bank because the 2 trolling batteries are up front by themselves so a two bank charger is all I need.

I check the starting battery from time to time but it never needs charging because it is just for starting (Suzuki df40) so it doesn't get drained much and starting such a small motor doesnt take many amps so never needs recharging at home (but I do have another charger in case it ever does), the motor recharges it well enough when I use it and they have lasted 4-5 years that way. suzukis have better charging systems then a lot of other motors too so that helps.