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


Post New Thread  Reply
 
Thread Tools Display Modes
Old 07-14-2020, 12:58 PM   #1
MrBritGolfFan
Getting Wild
 
Join Date: Jul 2020
Posts: 87
Default BigBattery Golf Cart 42.9v LiFePO4 and 600A Navitas on 2014 Ezgo RXV

Hi All, hoping I am able to provide my experience with this battery and get some advice/ help along the way.

I posted my setup in this thread along with pictures, i can copy it back here if that is preferred?

https://www.buggiesgonewild.com/show...6&postcount=24

and

https://www.buggiesgonewild.com/show...0&postcount=25

The top level issue i have:

Navitas 600 controller expects a 48v lead acid system, so will shut down when the voltage gets to about 41-42V. This BigBattery is rated 35V to 46.8V so Navitas cuts my useable power worse than a lead acid would at 50%.

Navitas can be set to 36v mode, but then it thinks the battery is too full, so starts dumping amps to the resistor coil, and that glows a nice pink/ red :) And i think will catch fire if i left it.

Navitas state they are working on updating their firmware to support me, and the lithium community, but what they expected would take 7-10 days is now 5+ weeks. I dont mind waiting, lots of rain in Florida right now, and i have had chance to do some other upgrades to the cart, and i feel grateful they will fix this for me. BUT - i dont want to be stuck here until Christmas still waiting.

I have my old Curtis controller, can that be re-programmed to work with this battery/ operate within its conditions? <This is my real question.

Please tell me if there are any specifics i need to post about the navitas controller or the curtis i will jump on that.

I've read so many posts on this forum over the years and its really helped me just being an observer, so big thank you in advance for any help anyone can offer.
MrBritGolfFan 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 07-14-2020, 01:31 PM   #2
Sergio
Gone Wild
 
Sergio's Avatar
Club Car
 
Join Date: Sep 2012
Location: Charlotte, NC
Posts: 9,334
Default Re: BigBattery Golf Cart 42.9v LiFePO4 and 600A Navitas on 2014 Ezgo RXV

Your best bet is unfortunately to wait for the Navitas software update that will give you a "range" instead of fixed voltage settings for the pack voltage.

I also noticed that BMS is rated for 130 amps so that could be an issue depending on your normal outside temperature and driving habits.

Is that graph you posted showing battery amps or motor amps?
Sergio is offline   Reply With Quote
Old 07-14-2020, 01:35 PM   #3
MrBritGolfFan
Getting Wild
 
Join Date: Jul 2020
Posts: 87
Default Re: BigBattery Golf Cart 42.9v LiFePO4 and 600A Navitas on 2014 Ezgo RXV

Quote:
Originally Posted by Sergio View Post
Your best bet is unfortunately to wait for the Navitas software update that will give you a "range" instead of fixed voltage settings for the pack voltage.

I also noticed that BMS is rated for 130 amps so that could be an issue depending on your normal outside temperature and driving habits.

Is that graph you posted showing battery amps or motor amps?
\

Thanks Sergio. The graph was amps from the battery.
MrBritGolfFan is offline   Reply With Quote
Old 07-14-2020, 01:38 PM   #4
MrBritGolfFan
Getting Wild
 
Join Date: Jul 2020
Posts: 87
Default Re: BigBattery Golf Cart 42.9v LiFePO4 and 600A Navitas on 2014 Ezgo RXV

Quote:
Originally Posted by Sergio View Post
Your best bet is unfortunately to wait for the Navitas software update that will give you a "range" instead of fixed voltage settings for the pack voltage.

I also noticed that BMS is rated for 130 amps so that could be an issue depending on your normal outside temperature and driving habits.

Is that graph you posted showing battery amps or motor amps?
Another idea i had, would it even be a viable option if i made a 7.2V LF battery rated at 85 ah and placed it in series to boost the voltage up, so the controller now sees a 48v? That all seems a bit clunky to me, i'd have two seperate BMS? two chargers?
MrBritGolfFan is offline   Reply With Quote
Old 07-14-2020, 09:19 PM   #5
BobBoyce
Gone Insane
E-Z-GO
 
Join Date: Oct 2015
Location: TN/NC/GA Tri-state area
Posts: 3,952
Default Re: BigBattery Golf Cart 42.9v LiFePO4 and 600A Navitas on 2014 Ezgo RXV

Quote:
Originally Posted by MrBritGolfFan View Post
Hi All, hoping I am able to provide my experience with this battery and get some advice/ help along the way.

I posted my setup in this thread along with pictures, i can copy it back here if that is preferred?

https://www.buggiesgonewild.com/show...6&postcount=24

and

https://www.buggiesgonewild.com/show...0&postcount=25

The top level issue i have:

Navitas 600 controller expects a 48v lead acid system, so will shut down when the voltage gets to about 41-42V. This BigBattery is rated 35V to 46.8V so Navitas cuts my useable power worse than a lead acid would at 50%.

Navitas can be set to 36v mode, but then it thinks the battery is too full, so starts dumping amps to the resistor coil, and that glows a nice pink/ red :) And i think will catch fire if i left it.

Navitas state they are working on updating their firmware to support me, and the lithium community, but what they expected would take 7-10 days is now 5+ weeks. I dont mind waiting, lots of rain in Florida right now, and i have had chance to do some other upgrades to the cart, and i feel grateful they will fix this for me. BUT - i dont want to be stuck here until Christmas still waiting.

I have my old Curtis controller, can that be re-programmed to work with this battery/ operate within its conditions? <This is my real question.

Please tell me if there are any specifics i need to post about the navitas controller or the curtis i will jump on that.

I've read so many posts on this forum over the years and its really helped me just being an observer, so big thank you in advance for any help anyone can offer.
I have reprogrammed many RXV Curtis controllers, and I always reprogram their input voltage range to accept lithium packs. This prevents undervolt and overvolt errors, and keeps the resistor from being activated within the typical normal lithium pack range.
BobBoyce is offline   Reply With Quote
Old 07-15-2020, 09:47 AM   #6
MrBritGolfFan
Getting Wild
 
Join Date: Jul 2020
Posts: 87
Default Re: BigBattery Golf Cart 42.9v LiFePO4 and 600A Navitas on 2014 Ezgo RXV

Quote:
Originally Posted by BobBoyce View Post
I have reprogrammed many RXV Curtis controllers, and I always reprogram their input voltage range to accept lithium packs. This prevents undervolt and overvolt errors, and keeps the resistor from being activated within the typical normal lithium pack range.
Thanks Bob. I have a question if i may, this LF battery pack spec is:

Nominal Voltage: 42.9V
Capacity: 88.59Ah (3.8kWh)
Configuration: 13S 6P
Chemistry: LiFePO4
Battery Management System: 13S BMS
Max Charge Voltage: 46.8V
End of Discharge Voltage: 35V

Would there be any issues with the RXV motor working with those voltages?

Would my original 235A curtis controller model: 1206AC-5201 be capable of being re-programmed to work with those voltage ranges? i.e. they are not too low are they?
MrBritGolfFan is offline   Reply With Quote
Old 07-16-2020, 03:59 PM   #7
BobBoyce
Gone Insane
E-Z-GO
 
Join Date: Oct 2015
Location: TN/NC/GA Tri-state area
Posts: 3,952
Default Re: BigBattery Golf Cart 42.9v LiFePO4 and 600A Navitas on 2014 Ezgo RXV

Quote:
Originally Posted by MrBritGolfFan View Post
Thanks Bob. I have a question if i may, this LF battery pack spec is:

Nominal Voltage: 42.9V
Capacity: 88.59Ah (3.8kWh)
Configuration: 13S 6P
Chemistry: LiFePO4
Battery Management System: 13S BMS
Max Charge Voltage: 46.8V
End of Discharge Voltage: 35V

Would there be any issues with the RXV motor working with those voltages?

Would my original 235A curtis controller model: 1206AC-5201 be capable of being re-programmed to work with those voltage ranges? i.e. they are not too low are they?
No problem whatsoever once the controller has been reprogrammed for that voltage range. 3 phase AC motor stator current will rise as the pack voltage falls, but that is totally normal in order to maintain rotor lock at the lower voltage.

Yes. I always reprogram the 235 Amp controllers to accomodate common lithium packs wider voltage range.
BobBoyce is offline   Reply With Quote
Old 07-17-2020, 12:37 PM   #8
MrBritGolfFan
Getting Wild
 
Join Date: Jul 2020
Posts: 87
Default Re: BigBattery Golf Cart 42.9v LiFePO4 and 600A Navitas on 2014 Ezgo RXV

Quote:
Originally Posted by BobBoyce View Post
No problem whatsoever once the controller has been reprogrammed for that voltage range. 3 phase AC motor stator current will rise as the pack voltage falls, but that is totally normal in order to maintain rotor lock at the lower voltage.

Yes. I always reprogram the 235 Amp controllers to accomodate common lithium packs wider voltage range.
Thanks Bob i had some buyer remorse concerns about the voltage, but did believe it should work, good to hear you say that for sure!
MrBritGolfFan is offline   Reply With Quote
Old 07-17-2020, 12:44 PM   #9
MrBritGolfFan
Getting Wild
 
Join Date: Jul 2020
Posts: 87
Default Re: BigBattery Golf Cart 42.9v LiFePO4 and 600A Navitas on 2014 Ezgo RXV

Last night i had an email from navitas, they are looking to update the app (i presume with a new firmware) next Tuesday/ Wednesday. Great news!

That gives me time to re-spray my white ezgo some other color...

naked ezgo rxv.jpg
MrBritGolfFan is offline   Reply With Quote
Old 07-17-2020, 04:41 PM   #10
BobBoyce
Gone Insane
E-Z-GO
 
Join Date: Oct 2015
Location: TN/NC/GA Tri-state area
Posts: 3,952
Default Re: BigBattery Golf Cart 42.9v LiFePO4 and 600A Navitas on 2014 Ezgo RXV

Quote:
Originally Posted by MrBritGolfFan View Post
Last night i had an email from navitas, they are looking to update the app (i presume with a new firmware) next Tuesday/ Wednesday. Great news!

That gives me time to re-spray my white ezgo some other color...

Attachment 206035
Glad to hear that. I was hoping that me talking about it recently would motivate them to fix that particular item. I'm wanting to get to the point that I can fully recommend Navitas upgrades for RXV owners. It'll definitely reduce my workload of Curtis controller reprogrammings.
BobBoyce is offline   Reply With Quote
Reply
Go Back   Buggies Gone Wild Golf Cart Forum > Golf Cart Repair and Troubleshooting > Electric EZGO > Lithium EZGO


Thread Tools
Display Modes


Similar Threads
Thread Forum
Navitas 600A Controller on 2018 RXV 48v - What should I expect? Electric EZGO
LifePO4 golf battery Lithium EZGO
Navitas 600a Update Failed Electric EZGO
2014 Yamaha gas golf cart rear end oil/ Transaxle fluid. Gas Yamaha
2014 Hardcore Karts Golf Cart Show Events/Places to ride


All times are GMT -5. The time now is 04:23 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 - 2022, 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.