starting the leaf swap, setting suggestions needed

panteramatt · 03-26-2020, 05:36 AM

So I have my 7 module setup coming in this weekend. My plan is to have it installed for the following weekends camping trip so I wont be installing a bms just yet. So, I have a few questions:

1. What should I set my charger to kick off at?

2. Is it ok to leave the charger on float or should I remove once charged?

3. What should I set my alltrax controller for LV shutoff at?

4. Should I disable regen braking?

5. Whats the max voltage I could or should run down to before it must be charged?

6. Is it safe for these batteries to be topped of at any time?

7. Any other suggestions I should change to the settings on the alltrax? I just got the cart and dont even know what any settings are at.

Volt_Ampere · 03-26-2020, 09:05 AM

What charger do you have???? You never "Float" a Lithium pack. Be mindful that if you do anything without a BMS you are risking disaster. The BMS balances your pack and prevents overcharge and overdischarge. You need to do some reading on this forum about how to deal with Lithium if you have not done so already. (and by your questions I doubt that you have studied this much)

panteramatt · 03-26-2020, 09:32 AM

Yes I will be putting a bms on it asap but wont be able to before I take it camping. I bout the 15a 58.8 charger that tech sells

panteramatt · 03-26-2020, 10:50 AM

This is the charger...

https://www.techdirectclub.com/58-8-...m-ion-battery/

Volt_Ampere · 03-26-2020, 11:40 AM

Good! That charger is proper for this pack. Be sure to balance the pack before charging to make sure you do not overcharge any cells if you don't have a BMS to protect against that. I would stay away from 100% charge and don't go below 20%. I charge to 90% routinely. I leave the Regen on with my Alltrax which is ok if you don't charge to 100%. I have a 14 module setup so my current limit is set at 400 amps.

Sergio · 03-26-2020, 12:22 PM

You need to figure out how to lower that charger voltage, 4.2v average per cell is too high if you don't have a BMS to prevent HV.

As mentioned, you have to completely disable Regen if you don't have a BMS.

Set the Alltrax overvoltage to 58v and undervoltage to 50v.

panteramatt · 03-26-2020, 12:33 PM

As usual thank you guys for the help! Maybe a stupid question but what's the best way to balance the cells before install?

johnabell67 · 03-26-2020, 12:50 PM

Quote:

Originally Posted by panteramatt

As usual thank you guys for the help! Maybe a stupid question but what's the best way to balance the cells before install?

believe just hooking them up and letting them set? maybe others will chime in that can confirm

panteramatt · 03-26-2020, 01:36 PM

Another newbie question, do you charge lithiums in tow or drive mode?

Sergio · 03-26-2020, 02:56 PM

Connect all of the batteries in parallel, meaning all positives together, all negatives together and all center terminals together, let it stay that way overnight.

The Tow/Run switch position will not affect the charging.

03-26-2020, 05:36 AM	#1
panteramatt Gone Wild Join Date: Jan 2014 Location: South Jersey Posts: 623	starting the leaf swap, setting suggestions needed So I have my 7 module setup coming in this weekend. My plan is to have it installed for the following weekends camping trip so I wont be installing a bms just yet. So, I have a few questions: 1. What should I set my charger to kick off at? 2. Is it ok to leave the charger on float or should I remove once charged? 3. What should I set my alltrax controller for LV shutoff at? 4. Should I disable regen braking? 5. Whats the max voltage I could or should run down to before it must be charged? 6. Is it safe for these batteries to be topped of at any time? 7. Any other suggestions I should change to the settings on the alltrax? I just got the cart and dont even know what any settings are at.

03-26-2020, 09:05 AM	#2
Volt_Ampere Gone Wild Join Date: May 2012 Location: Rio Verde, Az Posts: 7,183	Re: starting the leaf swap, setting suggestions needed What charger do you have???? You never "Float" a Lithium pack. Be mindful that if you do anything without a BMS you are risking disaster. The BMS balances your pack and prevents overcharge and overdischarge. You need to do some reading on this forum about how to deal with Lithium if you have not done so already. (and by your questions I doubt that you have studied this much)

03-26-2020, 09:32 AM	#3
panteramatt Gone Wild Join Date: Jan 2014 Location: South Jersey Posts: 623	Re: starting the leaf swap, setting suggestions needed Yes I will be putting a bms on it asap but wont be able to before I take it camping. I bout the 15a 58.8 charger that tech sells

03-26-2020, 10:50 AM	#4
panteramatt Gone Wild Join Date: Jan 2014 Location: South Jersey Posts: 623	Re: starting the leaf swap, setting suggestions needed This is the charger... https://www.techdirectclub.com/58-8-...m-ion-battery/

03-26-2020, 11:40 AM	#5
Volt_Ampere Gone Wild Join Date: May 2012 Location: Rio Verde, Az Posts: 7,183	Re: starting the leaf swap, setting suggestions needed Good! That charger is proper for this pack. Be sure to balance the pack before charging to make sure you do not overcharge any cells if you don't have a BMS to protect against that. I would stay away from 100% charge and don't go below 20%. I charge to 90% routinely. I leave the Regen on with my Alltrax which is ok if you don't charge to 100%. I have a 14 module setup so my current limit is set at 400 amps.

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03-26-2020, 12:22 PM	#6
Sergio Gone Wild Join Date: Sep 2012 Location: Charlotte, NC Posts: 9,329	Re: starting the leaf swap, setting suggestions needed You need to figure out how to lower that charger voltage, 4.2v average per cell is too high if you don't have a BMS to prevent HV. As mentioned, you have to completely disable Regen if you don't have a BMS. Set the Alltrax overvoltage to 58v and undervoltage to 50v.

03-26-2020, 12:33 PM	#7
panteramatt Gone Wild Join Date: Jan 2014 Location: South Jersey Posts: 623	Re: starting the leaf swap, setting suggestions needed As usual thank you guys for the help! Maybe a stupid question but what's the best way to balance the cells before install?

03-26-2020, 01:36 PM	#9
panteramatt Gone Wild Join Date: Jan 2014 Location: South Jersey Posts: 623	Re: starting the leaf swap, setting suggestions needed Another newbie question, do you charge lithiums in tow or drive mode?

03-26-2020, 02:56 PM	#10
Sergio Gone Wild Join Date: Sep 2012 Location: Charlotte, NC Posts: 9,329	Re: starting the leaf swap, setting suggestions needed Connect all of the batteries in parallel, meaning all positives together, all negatives together and all center terminals together, let it stay that way overnight. The Tow/Run switch position will not affect the charging.

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