Slow down...

mafialink · 08-07-2020, 06:25 PM

Does anyone know how the BMS works when battery is low? I went about 30 miles yesterday and then I noticed the cart slow down but was still running. Went from going 27mph to around 19mph. Would anyone know how much longer the cart would run for before it dies?

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Volt_Ampere · 08-07-2020, 06:36 PM

What are your cell voltages? It is critical that you don't run them down too far. My cart with Leaf cells does not slow down at all from fully charged to 20% charge which is as low as I ever take it.

cmysstailights · 08-07-2020, 07:46 PM

Im.always charging my cart. Lowest i let the cell pack go was 54v.

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Volt_Ampere · 08-08-2020, 08:43 AM

Individual cell voltages are important with Lithium - not total pack voltage. Lowest cell must not go too low or it will be damaged.

WalterM6 · 08-08-2020, 08:30 PM

The BMS is supposed to disable your cart when the batteries get too low. Perhaps your BMS is not wired in to disable your cart.

DaveTM · 08-09-2020, 08:10 AM

You need to provide much more information than you have given:

--Controller model and brand?
---Lithium battery brand?
---BMS brand?

As others have stated, if you let the lithium cell (not pack....each cell) drop below a certain number, you will "toast" the battery and put you in a very dangerous potential situation. (Like thermal runaway when charging) It only takes ONE TIME of letting a cell drop below the minimum for damage to occur.

mafialink · 08-09-2020, 04:17 PM

Quote:

Originally Posted by DaveTM

You need to provide much more information than you have given:

--Controller model and brand?

---Lithium battery brand?

---BMS brand?

As others have stated, if you let the lithium cell (not pack....each cell) drop below a certain number, you will "toast" the battery and put you in a very dangerous potential situation. (Like thermal runaway when charging) It only takes ONE TIME of letting a cell drop below the minimum for damage to occur.

Thanks everyone. I assume the only way to get these answers is to hook up the Curtis computer?

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mafialink · 08-12-2020, 06:24 PM

Quote:

Originally Posted by DaveTM

You need to provide much more information than you have given:

--Controller model and brand?

---Lithium battery brand?

---BMS brand?

As others have stated, if you let the lithium cell (not pack....each cell) drop below a certain number, you will "toast" the battery and put you in a very dangerous potential situation. (Like thermal runaway when charging) It only takes ONE TIME of letting a cell drop below the minimum for damage to occur.

How would you even know when your close to a cell dropping to a certain level.

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BobBoyce · 08-12-2020, 10:18 PM

Quote:

Originally Posted by mafialink

How would you even know when your close to a cell dropping to a certain level.

That is the job of the BMS. To monitor all cells in a lithium pack and take action when any cell drops too low or rises too high in voltage, and to balance the cells voltages so they stay within tolerance of one anothers voltages.

Bob

mafialink · 08-14-2020, 02:28 PM

Any good meter I can put on the cart to judge how much left I have before needing to recharge?

08-07-2020, 06:25 PM	#1
mafialink Getting Wild Join Date: Apr 2020 Posts: 91	Slow down... Does anyone know how the BMS works when battery is low? I went about 30 miles yesterday and then I noticed the cart slow down but was still running. Went from going 27mph to around 19mph. Would anyone know how much longer the cart would run for before it dies? Sent from my SM-G988U using Tapatalk
mafialink Getting Wild Join Date: Apr 2020 Posts: 91

08-07-2020, 06:36 PM	#2
Volt_Ampere Gone Wild Join Date: May 2012 Location: Rio Verde, Az Posts: 7,171	Re: Slow down... What are your cell voltages? It is critical that you don't run them down too far. My cart with Leaf cells does not slow down at all from fully charged to 20% charge which is as low as I ever take it.

08-07-2020, 07:46 PM	#3
cmysstailights Gone Wild Join Date: Mar 2019 Posts: 323	Re: Slow down... Im.always charging my cart. Lowest i let the cell pack go was 54v. Sent from my SM-G960U using Tapatalk
cmysstailights Gone Wild Join Date: Mar 2019 Posts: 323

08-08-2020, 08:43 AM	#4
Volt_Ampere Gone Wild Join Date: May 2012 Location: Rio Verde, Az Posts: 7,171	Re: Slow down... Individual cell voltages are important with Lithium - not total pack voltage. Lowest cell must not go too low or it will be damaged.

08-08-2020, 08:30 PM	#5
WalterM6 Gone Wild Join Date: Apr 2017 Location: SE TN Posts: 2,226	Re: Slow down... The BMS is supposed to disable your cart when the batteries get too low. Perhaps your BMS is not wired in to disable your cart.

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08-09-2020, 08:10 AM	#6
DaveTM Gone Wild Join Date: Oct 2012 Location: Southwestern Pa. Posts: 6,214	Re: Slow down... You need to provide much more information than you have given: --Controller model and brand? ---Lithium battery brand? ---BMS brand? As others have stated, if you let the lithium cell (not pack....each cell) drop below a certain number, you will "toast" the battery and put you in a very dangerous potential situation. (Like thermal runaway when charging) It only takes ONE TIME of letting a cell drop below the minimum for damage to occur.

08-14-2020, 02:28 PM	#10
mafialink Getting Wild Join Date: Apr 2020 Posts: 91	Re: Slow down... Any good meter I can put on the cart to judge how much left I have before needing to recharge?
mafialink Getting Wild Join Date: Apr 2020 Posts: 91

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