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Unread 07-11-2019, 06:35 AM   #1
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Default Duel Use of Lithiums in Cart and Boat

With the emerging lithium market of drop in replacement for lead acid, I'm researching the possibility of having a set of 4- 12 volt 100AH lithium batteries serve both my 48 volt DS cart and my fishing boat. I use the cart and boat at different times of the year so moving the pack would not be an issue. My DS cart has an OBC so that would be by-passed and I would purchase a 4-bank lithium charger that charges each battery separately. These batteries have their own BMS. The one concern I have is determining the max amp draw of my MOT-A4 motor. I seldom use more than half throttle on the cart and typically cruise around 10mph on trails.

Thoughts?
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Unread 07-16-2019, 12:31 PM   #2
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Default Re: Duel Use of Lithiums in Cart and Boat

What controller do you have in your cart?

If the motor is capable of drawing 9,000,000 amps but the controller can only draw 200 amps then your max draw is 200 amps.
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Unread 07-16-2019, 01:37 PM   #3
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Default Re: Duel Use of Lithiums in Cart and Boat

[QUOTE=bronsonj;1636038]What controller do you have in your cart?

Alltrax XCT500
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Unread 08-01-2019, 07:06 AM   #4
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Default Re: Duel Use of Lithiums in Cart and Boat

Quote:
Originally Posted by bronsonj View Post
What controller do you have in your cart?

If the motor is capable of drawing 9,000,000 amps but the controller can only draw 200 amps then your max draw is 200 amps.
In my case, I have more controller amps (500) available than the motor can draw. I performed three run test and the road hill climb was the most demanding at 290 amps peak. So, my limitation of the drop in lithium's I'm considering is the max continuous current draw of 100 amps. I set my XCT controller to limit the battery current draw to 100 amps and it made a huge difference in performance. I plan to do the same 3 test runs to compare but I'm having my doubts that drop in lithium may not work for me.
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Unread 08-01-2019, 07:44 AM   #5
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Default Re: Duel Use of Lithiums in Cart and Boat

Lowering the throttle rate will also reduce the motor current demand during acceleration as it prevents the motor from getting too deep into its inefficient region.
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Unread 08-01-2019, 08:42 AM   #6
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Default Re: Duel Use of Lithiums in Cart and Boat

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Lowering the throttle rate will also reduce the motor current demand during acceleration as it prevents the motor from getting too deep into its inefficient region.
Yeah Sergio, from memory I think my throttle rate is set at 25%. BTW, I just checked the Trojan Trillium spec sheet and those batteries have a 250 amp continuous current rating which I could easily adjust to but at a premium cost. I'm curious if other members with big controllers/motors that have done the DIY packs are managing the high amp draw.
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Unread 08-01-2019, 09:19 AM   #7
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Default Re: Duel Use of Lithiums in Cart and Boat

The higher capacity Trillium, 92AH and 110AH can deliver 250 amps only for 30 seconds at a 77F temperature, much less when they get hotter.
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Unread 08-01-2019, 10:42 AM   #8
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Default Re: Duel Use of Lithiums in Cart and Boat

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The higher capacity Trillium, 92AH and 110AH can deliver 250 amps only for 30 seconds at a 77F temperature, much less when they get hotter.
The 30 second time limitation is applicable to a 350A draw per my data sheet on the Trillium.
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Unread 08-01-2019, 11:42 AM   #9
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Default Re: Duel Use of Lithiums in Cart and Boat

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The 30 second time limitation is applicable to a 350A draw per my data sheet on the Trillium.
Maybe we are talking about a different battery model, here is the data sheet for the biggest 12v Trilium they have, the 110AH:

https://www.trojanbattery.com/pdf/da...m_12.8-110.pdf

All of the Trillium 12v batteries have a 1C maximum continuous discharge rate.
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Unread 08-01-2019, 12:59 PM   #10
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Default Re: Duel Use of Lithiums in Cart and Boat

Sergio, you are correct. The data sheet I have was from Oct 2018. Trojan has updated the Trillium specs on their website. Thanks!
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