Author Topic: Boat battery help.  (Read 2272 times)

Offline birddogdad

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Re: Boat battery help.
« Reply #15 on: August 01, 2022, 10:51:34 AM »
kind of in this situation myself.. have 2 series 24 batteries in my boat. found my alternator was needing replacement (first step) as at idle, it was running battery voltage vs closer to 14V charge rate... i have lots of electronics, radar, 2 charts, lights, downriggers ect.. can be a larger draw... change if not done to LED bulbs if you run these to reduce draw..

Make sure you purchase SAME GROUP batteries, 24s are not very big,  i am going bigger here, sure Lithium are wonderful but you can get 3 AGMs for the cost of one and increase your ampacity by different group (27 or even 31 if you have room).

Discussed is a switch for selecting batteries (1/2/both/ off) if you dont have, its a good upgrade ** NOTE** NEVER shift with a motor running, you will fry your electronics connected!

Cover positive terminals and dielectric grease is your friend!

oh, those COSTCO 27 group marine rv batteries are ok (90$ ish) and NAPA makes a 27 group 8301 marine dual purpose ( 150ish$)with a bit more ampacity as well.. 

if you are running a trolling rig, biggest baddest batteries would be my thought, i know lithium is the go too here but your use/hours really makes up the cost decision .. you can maintain them separate and install a charging system to plug in when home?

hope this helps!

USN retired

Offline spin05

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Re: Boat battery help.
« Reply #16 on: August 03, 2022, 05:12:50 AM »
Get a Odyssey extreme.  There's a guy in Seattle selling 1 year old ones taken out of commercial vehicles for $100. Hes got entire pallets. There model 2150.  I put one in my boat and its been excellent.  There normally a $550 battery new.   Looking to add another in the future.


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