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07-12-2019, 10:01 AM | #1 |
Gone Wild
Join Date: Sep 2016
Posts: 515
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Drop in Lithium to Replace FLA in Cart & Boat
My 48 volt cart and boat will both be needing batteries so I'm considering going with a single set of (4 )12V drop-in lithium batteries to use in both. My cart is only used during hunting season and the boat is used outside of the hunting season so it's not an issue to transfer the set from one to the other. I'm thinking 100AH batteries will work but I'm not sure of what the amp draw is on my Admiral MOT-A4 motor is but I seldom push the cart above half throttle and cruise trails around 10mph. Each battery will have it's own BMS and I'll get a 4-bank 12 volt lithium charger and make it portable.
I know the majority of this forum centers around DIY lithium builds but if this would work, it would be the best of both worlds for me on land or sea. I would love to see some comments/questions/observation from the lithium group. Thanks in advance! |
07-12-2019, 11:27 PM | #2 | |
Getting Wild
Join Date: Nov 2018
Posts: 92
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Re: Drop in Lithium to Replace FLA in Cart & Boat
Quote:
Up to 110A continuous, and about 200A peak. |
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07-13-2019, 06:38 AM | #3 |
Gone Wild
Join Date: Sep 2016
Posts: 515
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Re: Drop in Lithium to Replace FLA in Cart & Boat
[QUOTE=Up to 110A continuous, and about 200A peak.
Thanks for sharing the Red Hawk chart Cricket, good info. The specs on the lithium battery I'm considering has a maximum continuous discharge current limitation of 100A and a peak discharge current of 350A for 3 sec. If I 'm understanding battery wiring correctly then batteries wired in series will be limited to the characteristics of one battery. So, on the surface with my cart and my driving habits, these batteries should be OK. |
07-13-2019, 05:04 AM | #4 |
Gone Wild
Join Date: Oct 2012
Location: Southwestern Pa.
Posts: 6,214
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Re: Drop in Lithium to Replace FLA in Cart & Boat
Going to a 100AH battery....running your boat you may get about 1 hour of constant run time? Doesn't seem like enough to me.....but depends upon the pond size!!!
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07-13-2019, 06:53 AM | #5 |
Gone Wild
Join Date: Sep 2016
Posts: 515
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Re: Drop in Lithium to Replace FLA in Cart & Boat
Dave, good observation as usual. I should have provided a little more detail about the boat. It's an old bass boat with a 150hp outboard and a 24 volt trolling motor. My thinking is when I put the 4 lithium's in my boat, 2 of the batteries would be wired in series to power the 24 volt trolling motor and the other 2 batteries would be wired in parallel for 12 volts for starting outboard and running accessories.
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07-13-2019, 10:28 AM | #6 |
Getting Wild
Join Date: Nov 2018
Posts: 92
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Re: Drop in Lithium to Replace FLA in Cart & Boat
Probably not a good idea. You'll get those batteries to degrade at different rates, then when you put them all back in series the weaker ones will be cutting out sooner while the rest will of the string is still strong.
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07-13-2019, 12:54 PM | #7 |
Gone Wild
Join Date: Sep 2016
Posts: 515
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Re: Drop in Lithium to Replace FLA in Cart & Boat
I typically only use my boat on 2 fishing trips a year, March & May and both trips consist of 4 days on the water and batteries are fully charged after each day. I will alter the batteries between the two trips, the two I use for trolling in March, will be used for cranking and accessories in May .The other 357 days of the year the batteries will be in the cart as a series pack. This is the primary driver for the dual use.
I very much appreciate the comments. |
07-14-2019, 12:12 AM | #8 |
Gone Wild
Join Date: Nov 2016
Location: near Calgary, AB, Canada
Posts: 1,516
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Re: Drop in Lithium to Replace FLA in Cart & Boat
Not sure what kind of cranking amps a 150 hp outboard draws but you might want to confirm that the cranking amp requirements match the capacity of your proposed lithium batteries. Does that "old bass boat" start up in under 3 seconds or it a 15 second starter?
You would hate to "suck the guts" out of your lithium golf cart batteries by using them as starter batteries ... I am not sure if they are really designed for that. You might want to consider using a single $100 lead acid "starter" battery for your outboard and use the expensive 4 lithium battery set up for both the accessories and 24 volt trolling motor. That might be a safer combination. Good idea to use a shared lithium pack for both your cart and boat |
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