onboard charger

[dada2727]

I've had a few different opinions on this, and was curious to hear a few more before I made my choice. I have a 12 volt trolling motor and 2 deep cycle batteries, because 1 usually doesn't last the whole day. I would like to hook the two batteries up in parallel esentially making one big battery because I am sick of changing them over on the lake, so will a 2 bank charger work if one bank is on each battery, or is that like charging one battery with 2 banks because they are in parallel?

 

Will this work or how do I get around this? I was thinking about just using one bank on both but that would probably take a long time to charge them both, sometimes not being ready to go for the next morning I'm guessing.

 

thx

[Terry]

yeah

just hook up the one bank to charge them, unless you disconnect the batteries before you charge them

[hirk]

yeah

just hook up the one bank to charge them, unless you disconnect the batteries before you charge them

What Terry said

[John Bacon]

You could rig a switch into the wires that connect the batteries in parallel. Flick the switch to the off position when you are charging; the batteries would not be connected to each other with the switch in the off position, so using both banks should be okay.

 

I am not sure what would happen if you forgot to switch the connection off and left the batteries connected in parallel while they were both connected to the charge.

[dada2727]

how long do you think it would take a 10amp charger to charge both batteries from dead if they were hooked up in parallel?

[hirk]

how long do you think it would take a 10amp charger to charge both batteries from dead if they were hooked up in parallel?

They would draw 5amps ea.Your batteries would seldom be much under 50% charge so if they are m-27's (120amp)@ 50% discharge it would take 12hrs to full charge.