Canoe Dual Battery

148

02:03:29

This is my attempt to wire two boat batteries in such a way that, depending on switch settings either one, or the other or both batteries (in parallel) power the electric trolling motor (lower middle lamp) which should pull 20 amps. Also,  I want to be able to power the running lights (top right lamp, 2 amps) and accessory jack (top left lamp, 4 amps) using either battery A or battery B , regardless of which is powering the motor.  I included two diodes to keep the two batteries from trying to charge each other, but that caused a problem.  The current through the trolling motor is vastly reduced, apparently because of the effective resistance of the diodes.

Anyone know a better way to do this?

Thanks

published 9 years ago

jass1989

9 years ago

In real life on my boat here is what I have. An A/B switch for the acc and lights. On the engine starter I have A/B/Both switch. You don't have to worry about parallel batteries as long as you either have a constant charge like that from an alternate or a constant discharge.

jass1989

9 years ago

Another thing to do it a momentary switch with constant current contactor for parallel connection like a motorhome

faceblast

9 years ago

use power mosfets

faceblast

9 years ago

http://everycircuit.com/circuit/6378215082295296

jhardegr

9 years ago

I want to clarify that I want to use this with two deep cycle batteries and an electric trolling motor. There is no alternator or other charging system. I would just like to be able to use the A/B/both switch to select that the motor runs off of either the A battery, the B battery, or both, while at the same time allowing the running lights to be run from either the A or B battery, regardless of which one or ones are running the trolling motor. The MOSFET example looks interesting but I'm having trouble figuring out where the motor and lamps are connected in that circuit, so a little more explanation would be helpful and appreciated. Thanks

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