Thread: Battery question

Don't connect your Sonar units to the Trolling Motor batteries. You'll have interference issues on the sonar units. I went with a larger cranking battery, group 31, for all my boat electrical needs (pumps, sonar, main motor, lights, aerators, stereo, etc. Always had plenty of power to start the main motor even after a day of spider rigging during a Crappie Tournament. Pumps running, sonar, M360, etc. all on, even the stereo is on. 8 hours running all of it and the main fires right up.

Never had an issue taking the grandkids out swimming off the boat either. Anchored up in a cave cranking the tunes, and swimming all day. Fires right up.

I too don't have room for a dedicated electronics battery, but I do have room for a group 31 and it has performed flawlessly.

Originally Posted by icehouse

I have put together a dewalt 20v system for my electronics! This way I never have to worry about draining any power from big batteries.


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Saw a live scope set up done this way . Seems like the way to go . Two in a ammo box .

Be an easy way to get power at the front of the boat. Provided you already have the batteries

I already had 5 batteries for all of my tools! I used a Cabelas ammo box to mount the system in. Attached it to the boat with a cheap Johnny Ray mount. Bought my battery bases from Makermotor for a lot less then anyone else sells them. The DC converter was $9 on EBay. I also put a USB charger and voltage meter on the top. It works great.


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How long will they run your electronics?

Originally Posted by DockShootinJack

How long will they run your electronics?

I’ve been out 8 hours and have yet to have my 2 battery setup be below 2 bars on each battery. Last Friday my buddy and I were out for 5 hours and my single battery setup on the console still had 1 bar and was showing 11.9 v on the screen when we finished for the day.

Keep in mind, I’m only running the Garmin echomap uhd 73SV.


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I can post pics of my setup tomorrow if anyone wants to see it. I did all of the work myself.


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Good amount of run time. Do you notice decreased run times in cold weather?