09-22-2021, 11:29 AM | #1 |
Not Yet Wild
Join Date: Sep 2021
Posts: 9
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48v Lithium 48ah pack
Would a lithium pack thats rated at 48ah...be comparable to running 12vx4 lead acid batteries? Considering you run those to 50% and lithium you can run all the way down?
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09-22-2021, 12:02 PM | #2 |
Gone Wild
Join Date: Oct 2012
Location: Southwestern Pa.
Posts: 6,214
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Re: 48v Lithium 48ah pack
You can't "run lithium" all the way down. Lithium has a low voltage point that when it gets lower than that, the battery is damaged. It only takes one time.
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09-22-2021, 01:05 PM | #3 |
Gone Wild
Join Date: Jul 2018
Location: Ramer, AL
Posts: 1,448
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Re: 48v Lithium 48ah pack
Welcome to the forum....I don't think a 48ah will be near sufficient to run a golf cart for very long.
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09-22-2021, 02:40 PM | #4 |
Gone Wild
Join Date: Dec 2016
Location: Kingsland, Georgia
Posts: 1,825
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Re: 48v Lithium 48ah pack
That 48Ah pack will give you a safe usable Ah of 34.5. This is based on 90% settling voltage of 53.2 and a safe minimum SOC of 20% and 51.2 volts. You can go lower occasionally to get the cart to the barn. This 90% will be calibrated as 100% on your SOC meter.
For flat paved road use, you can estimate 1.5 Ah per mile. This has been true in my case over 10 documented rides from 8 miles to 27 miles per trip. My 72 Ah battery gives me a range of 39 miles safely. I charge after each trip of a mile or more. Your cart drive setup, speeds, conditions, etc. may affect this estimate. You could expect 20 miles per charge cycle based on this. (48Ah, -10% settling charge, -20% minimum SOC, divided by 1.5 equals 23 miles.) My formula may not work for all users. If golfing, I'm not sure what this mileage would correlate to. |
09-22-2021, 06:00 PM | #5 | |
Not Yet Wild
Join Date: Sep 2021
Posts: 9
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Re: 48v Lithium 48ah pack
Quote:
So lets so I did go this route, which I dont know if I would...I could still use a standard voltage digital readout...and make sure it stays in the safe reading of low voltage? once again...thanks for the useful information. |
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09-22-2021, 09:05 PM | #6 | |
Not Yet Wild
Join Date: Sep 2021
Posts: 9
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Re: 48v Lithium 48ah pack
Quote:
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09-22-2021, 09:33 PM | #7 | |
Gone Wild
Join Date: Dec 2016
Location: Kingsland, Georgia
Posts: 1,825
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Re: 48v Lithium 48ah pack
Quote:
https://www.amazon.com/Renogy-500A-B...364315&sr=8-13d This is similar to what I have: https://www.amazon.com/AiLi-Voltmete...364489&sr=8-18 |
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09-22-2021, 09:50 PM | #8 | |
Not Yet Wild
Join Date: Sep 2021
Posts: 9
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Re: 48v Lithium 48ah pack
Quote:
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09-23-2021, 05:41 AM | #9 |
Gone Wild
Join Date: Dec 2020
Location: Melbourne, Australia
Posts: 1,941
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Re: 48v Lithium 48ah pack
Don’t know about the AiLi unit but the Renogy is fully programmable.
A 48Ah pack would be comparable but make sure the pack is a single 48v pack, not 4 12v packs and that the cells and the BMS can handle the current requirements of your cart. You don’t want your BMS shutting off when accelerating. Most cheaper cells can only handle 1C or 2C discharge, that’s only 48A or 96A, which won’t be enough. Do you have a link to the specific pack you’re looking at purchasing? Cheers Pat. |
09-23-2021, 06:35 AM | #10 |
Gone Wild
Join Date: Oct 2012
Location: Southwestern Pa.
Posts: 6,214
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Re: 48v Lithium 48ah pack
My ZEVA BMS has a screen that shows amp\hrs along with the pack voltage.
I'm not an engineer and have some understanding of amp\hrs on a read-out device, but frankly I never pay attention to it. What I look at is the pack voltage at rest. I know I'm fully charged when my volts read 57V. And I know that when my volts read 50.0 at a rest......I have very little run time\distance left.....like a few hundred yards to be safe. Usually I recharge when the pack hits 51V at a rest. FWIW |
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