lifted club cars - lifted ezgo
Home FAQDonate Who's Online
Go Back   Buggies Gone Wild Golf Cart Forum > Golf Cart Repair and Troubleshooting > Electric Club Car > Lithium Club Car


Post New Thread  Reply
 
Thread Tools Display Modes
Old 12-04-2020, 06:39 PM   #111
Volt_Ampere
Gone Wild
Yamaha
 
Join Date: May 2012
Location: Rio Verde, Az
Posts: 3,134
Default Re: 48volt club car limthium battery exploded

Most BMS do not provide enough balance current to do the job in a reasonable amount of time with the packs we use. I designed and built my own and I use a 1 amp balance current. This causes a fairly large voltage drop in the sense lines so I don't sense the voltage during the time that the balance current is on. I turn it off for a couple seconds to measure the cell voltages. I used power resistors and gave them plenty of air cooling space because at 1 amp they are dissipating 4W each. This is why most BMS do not balance at a very high current - they don't want to deal with the heat generated.
Volt_Ampere is offline   Reply With Quote
Alt Today
BGW

Golf car forum Sponsored Links

__________________
This advertising will not be shown in this way to registered members.
Register your free account today and become a member on Buggies Gone Wild Golf Cart Forum
   
Old 12-04-2020, 07:07 PM   #112
swb713
Gone Wild
 
swb713's Avatar
Columbia
 
Join Date: Aug 2018
Location: Orange County, California
Posts: 272
Default Re: 48volt club car limthium battery exploded

Quote:
Originally Posted by Murby View Post
I agree.. big difference between an American product made in China and a Chinese product made in China.

The BMS units sold by most of these online retail shops are just cheap Chinese garbage that barely do what they're supposed to do.

I'm eventually going to swap my LA bats for lithium in my 2013 Precedent when they wear out.. and no way will I be using a Chinese BMS and having that thing charge in my garage.

My off grid system uses 25kWh worth of cells from a Chevy BOLT EV.. and I use a REC BMS. They are in my basement in a 14ga NEMA4x Hoffman enclosure. Might switch to Batrium or Orion when I do the cart.. will probably stick with REC since I'm so familiar with it now.

Here's a pic of the off grid unit.. When I got these cells, they were brand new, never cycled LG Chem. Going to wait for a deal like that to show up again for the golf cart.
A single stack of 14 is about the size of two loafs of bread with a capacity of about 6kWh. Two of them (65lb ea) could easily fit into the battery bay of my cart.. would probably give me 80 miles on a charge.. with the way I drive, I'd only have to charge the cart once a month.

People need to stop trusting Chinese stuff when failure has catastrophic consequences. It just isn't worth the gamble.

Either that, or switch to phosphate batteries.. when they go rogue, its basically just a smoke bomb.
Very nice and CLEAN work.
swb713 is offline   Reply With Quote
Old 12-04-2020, 08:18 PM   #113
Murby
Getting Wild
 
Join Date: Oct 2019
Posts: 95
Default Re: 48volt club car limthium battery exploded

Quote:
Originally Posted by Volt_Ampere View Post
Most BMS do not provide enough balance current to do the job in a reasonable amount of time with the packs we use. I designed and built my own and I use a 1 amp balance current. This causes a fairly large voltage drop in the sense lines so I don't sense the voltage during the time that the balance current is on. I turn it off for a couple seconds to measure the cell voltages. I used power resistors and gave them plenty of air cooling space because at 1 amp they are dissipating 4W each. This is why most BMS do not balance at a very high current - they don't want to deal with the heat generated.
When I put my pack together I had 2 of the 14 cell-packs that were 50mv below the other 12. When the REC was balancing, it was bleeding down 12packs at a time through those power resistors.. The BMS is designed to stop balancing when it hits 55degC.. and that's exactly what it did. hit 55, shut off for a while until it cooled down some, then went back to work.

Since it was a one time thing (new pack), I just put a computer muffin fan on it to blow air across the case to help it out.

I have my balancing settings pretty tight as I don't let any cell go beyond 10mv of the rest.

I find it impressive that you built your own.. Not sure I'd want to invest that kind of effort into it, but if I did, I would employ multiple redundant backups for safety.
Murby is offline   Reply With Quote
Old 12-04-2020, 08:21 PM   #114
Murby
Getting Wild
 
Join Date: Oct 2019
Posts: 95
Default Re: 48volt club car limthium battery exploded

Quote:
Originally Posted by swb713 View Post
Very nice and CLEAN work.
Thanks! Its amazing to watch it trick the Grid Tie solar inverters to make power off grid.
Charged it at 120 amps and the pack temperature went up just 2 degreesC. LOL.

I bought 70 of those cells.. wish I had bought 200. They're absolutely amazing.
Murby is offline   Reply With Quote
Old 12-13-2020, 12:57 PM   #115
simicrintz
Gone Wild
 
simicrintz's Avatar
Club Car
 
Join Date: Apr 2020
Location: San Diego
Posts: 582
Default Re: 48volt club car limthium battery exploded

"Very nice and CLEAN work."

I second that, but you gotta cut those tails off of the wire holders-it's bugging my OCD
simicrintz is offline   Reply With Quote
Reply

Tags
club car, explosion, fire, fire truck, linthium battery
Go Back   Buggies Gone Wild Golf Cart Forum > Golf Cart Repair and Troubleshooting > Electric Club Car > Lithium Club Car


Thread Tools
Display Modes


Similar Threads
Thread Forum
Club car ds series 03 48volt 36 volt battery life sucks Electric Club Car
Another Battery exploded Electric EZGO
Battery exploded Electric EZGO
Converting 48volt yamaha charger to 1998 48volt club car Electric Club Car
Battery leaking Club Car 48volt Electric Club Car


All times are GMT -5. The time now is 07:36 PM.


Club Car Electric | EZGO Electric | Lifted Golf Carts | Gas EZGO | Used Golf Carts and Parts

Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2021, vBulletin Solutions, Inc.
This Website and forum is the property of Buggiesgonewild.com. No material may be taken or duplicated in part or full without prior written consent of the owners of buggiesgonewild.com. 2006-2017 Buggiesgonewild.com. All rights reserved.