HELP! Advice for 24v Battery

[Lund]

Great people of Crappie.com I need your help/advice for what battery(ies) to get to fit in my boat. I got the Garmin Force (it needs a 24v or 36v battery) and what I have is a 12v (thought was 24v).

This is the area I have to work with. The area size is length 14 3/4" x wide 10 1/4" x height 9 7/8"
Battery inside is a group size 27 deep cycle.

Corner of battery holder extra space


I do not know what type, size, how many etc. to put there to make it work reasonably well for my Force trolling motor. I would like a good battery but also don't want tell my wife I need a battery that is ~a mortgage payment!

If it helps, this is a 02 Lund Explorer 1675 SS

I really appreciate your time and help!!

[M R Dux]

Check the lithium 24 volt batteries from Skinny Water Marine. Great batteries and even better people to deal with. Lithiums are going to be more $$ but well worth it, mine will probably outlive me.

[Lund]

Thank you! How many AH do you have? How many do you suggest?

[BuckeyeCrappie]

I would go with the 100Ah. It’s dimensions are too big for your battery area (

20.5”L x9.5”W x 8.5″H).

The 60Ah dimensions are (

13.6”L x6.75”W x 8.5″H) and should work just fine. Here is the link 24V 60AH Lithium Deep Cycle Lithium Marine Battery

Hope this helps.

[Grainraiser]

Your gonna need to go with a lithium battery (more expensive) or find a place for another 12 volt battery like the one you have pictured.

[happycaster58]

You've got 2 choices- either find a place to fit 2 12 volt ones like you have and link them together (in series) or plan on spending $1000+ for one lithium battery to fit your existing compartment!

[slowhand]

A question popped up while reading your thread, is your existing wiring up to handling the 24 volt load from the TM?

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[Lund]

A question popped up while reading your thread, is your existing wiring up to handling the 24 volt load from the TM?

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Honestly not sure. How do I tell?


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[slowhand]

If it's the original wiring, it's 20 years old. And sized for a 12 volt. Boat manufacturers just got by with as small a wire as they could. Garmin should have a chart that shows the recommended wire size, based on draw and length of wire.
I used a Minn Kota chart for my TM wiring up grade to 24 volts. Get marine grade wire, and circuit breaker rated for the amp draw.
I think my old wire was 10 gauge, and I replaced it with either 6 or 4 gauge wire for a 16 foot run. I can't remember exactly off the top of my head.

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[Doninva]

I see a problem that no one has mentioned, l think. Your 12 volt battery has items hooked to it now so you will still need a 12 volt battery. Also, if using 2 batteries in series, it is not recommended to use one to feed 12 volt items while using 24 volts for a trolling motor. If a 12 volt 55 pound trolling motor is pulling say 50 amps on high, a 24 volt 55 pound trolling motor will be pulling 25 amps so smaller wire will work. I run my 80 pound Terrova on #6 because that was what l had on hand but 8 or 10 would work. I would go with 8 or 6 gauge as 10 is pushing it. Don