working on my new boat. 14' Smokercraft. I am considering upgrading to an 80lb trolling motor. I also run two 9" Garmin Echomaps, two livewell pumps (only one at a time), and maybe a bile pump. Current setup allows for two group 29 batteries, one for my current trolling motor, and one for my electronic stuff. If I get a new 24v system, and run two group 29 batteries, can I run everything off the two batteries? I fish electric only lakes mostly. I was thinking of putting another group 27 battery in the back for the electronics and the transom motor when running from spot to spot.

 

what should I do?

 

 

Edit: new plan is run two group 29 batteries for new trolling motor up front, buy a group 24 and run it for electronics

Edited March 12, 20206 yr by Quarry Man
change of plans man

Suggestion:

Add up the current draw of all your electronics. Multiply by the max number of hours you expect to be out on the lake.

For the TM - multiply current draw by number of hours you expect to run it. If you only run it 2 hours for 6 hours on the lake - then use it's current draw times 2 instead of 6

Add the first two numbers.

Add 15%-20% - lowest you want to drain your battery to.

 

That'll give you the AH rating you want to shoot for.

 

If you can't find a battery with that AH rating, go for the max you can - subtract 15% and divide by the current draw - that'll give you the number of hours you can be out.

 

For me:

.5amps for fishfinder, 2amps for tablet and phone times 5 hours = 12.5ah

30 amps (speed 5) X 1.75 hours for TM = 52.5ah

Total is 65ah - +15% = 74.75ah

I got a 75ah battery for my canoe.

2 minutes ago, MN Fisher said:

Suggestion:

Add up the current draw of all your electronics. Multiply by the max number of hours you expect to be out on the lake.

For the TM - multiply current draw by number of hours you expect to run it. If you only run it 2 hours for 6 hours on the lake - then use it's current draw times 2 instead of 6

Add the first two numbers.

Add 15%-20% - lowest you want to drain your battery to.

 

That'll give you the AH rating you want to shoot for.

 

If you can't find a battery with that AH rating, go for the max you can - subtract 15% and divide by the current draw - that'll give you the number of hours you can be out.

 

For me:

.5amps for fishfinder, 2amps for tablet and phone times 5 hours = 12.5ah

30 amps (speed 5) X 1.75 hours for TM = 52.5ah

Total is 65ah - +15% = 74.75ah

I got a 75ah battery for my canoe.

interesting.

 

I will look into this

 

thanks as always