48V to 56V conversion ?

[PuttPutt]

Originally Posted by disland

@bronsonj what kind of top end speed are you getting with a 48V lithium and the 300AMP Alltrax.

I have a 300amp system club car but thought I would need to change out everything (controller, solenoid, motor etc) to go lithium?

Does it being a club car make a diffefrence in lithium performance?

Everything I know about lithium batteries I read about here on the forum last week anyway I read in one of the many posts that the controller doesn't care about lead acid or lithium the controller only cares about the voltage you give it. Now lets hope one of the experts chimes in with an educated answer.

[PuttPutt]

Originally Posted by JohnnieB

Check with Alltrax for a field map for a B2 motor that is designed for hilly terrain.

I don't know if one exists, but there are several maps out there.

Also, try is with Turbo turned off. That will cost you some on top speed, but might up the speed it slows to on hills.

-----------
Record a datalog and we can take a look at what is happening when cart slow on the hills. Might show something that is easy to fix.

I checked with Alltrax and the field map I have is the best for hilly terrain with my setup.

Turbo on turbo off I didn't notice a difference.

Attached a couple log files one on flat ground and one on a long hill. On the flat run I did not hit my max rpm (6000) didn't get to 5500 until slight downhill.


Batteries were off the charger for three full days

Pack voltage 51.2

each battery:
8.52
8.55
8.62
8.56
8.53
8.52


after running around going up several hills and trying to capture different log files I checked each battery on the same hill.

under load
7.35
7.42
7.66
7.33
7.46
7.38

just tried to upload files and it said invalid file . I will try again when I get home later.

[PuttPutt]

hope this worked log files attached.

[BBBHC]

Originally Posted by disland

I have a 300amp system club car but thought I would need to change out everything (controller, solenoid, motor etc) to go lithium?

Does it being a club car make a diffefrence in lithium performance?

Better performance, yes. You shed a lot of weight! Also lithium can deliver more amps quicker than lead acid. Manufacturer of cart does not matter, Club Car, EZGO, Yamaha, etc. would all benefit

Originally Posted by PuttPutt

Everything I know about lithium batteries I read about here on the forum last week anyway I read in one of the many posts that the controller doesn't care about lead acid or lithium the controller only cares about the voltage you give it. Now lets hope one of the experts chimes in with an educated answer.

Voltage and amps are the concern

To be clear, I am NOT an expert on lithium. I have just finished a lithium build and got the cart running, just need to do the motor break-in and road test. Here is a thread I started on my build: http://www.buggiesgonewild.com/lithi...ld-thread.html It's a bit hard to follow, if you are just looking for information on converting from lead acid to lithium batteries. Since I went from gas powered to electric.

Here is, in my opinion, one of the best threads I have found on here, concerning the conversion. http://www.buggiesgonewild.com/lithi...ghlight=DaveTM It gives some good information on different lithium battery specs and setups.

The short story, electrical components don't care what kind of batteries they get their power from. So, as long as you get an appropriate size battery pack (volts and amps), your existing components can still be used. The main thing with these swaps, is taking care of the batteries. Both for safety and longevity. BMS (Battery Management System) is the main thing. Lithium batteries are sensitive to heating up, over charge and over discharge. There are "plug and play" lithium batteries you can get that takes out all of the guess work. They are PRICEY. Using batteries from cars is the most popular, because they are more affordable. However, this requires solving the guess work. There are many ways of going about this, the links I put here are just two examples. There are many more threads on here. Feel free to ask me any questions on my thread or PM. I'll answer any I can.

[PuttPutt]

Originally Posted by BBBHC

Better performance, yes. You shed a lot of weight! Also lithium can deliver more amps quicker than lead acid. Manufacturer of cart does not matter, Club Car, EZGO, Yamaha, etc. would all benefit

Voltage and amps are the concern

To be clear, I am NOT an expert on lithium. I have just finished a lithium build and got the cart running, just need to do the motor break-in and road test. Here is a thread I started on my build: http://www.buggiesgonewild.com/lithi...ld-thread.html It's a bit hard to follow, if you are just looking for information on converting from lead acid to lithium batteries. Since I went from gas powered to electric.

Here is, in my opinion, one of the best threads I have found on here, concerning the conversion. http://www.buggiesgonewild.com/lithi...ghlight=DaveTM It gives some good information on different lithium battery specs and setups.

The short story, electrical components don't care what kind of batteries they get their power from. So, as long as you get an appropriate size battery pack (volts and amps), your existing components can still be used. The main thing with these swaps, is taking care of the batteries. Both for safety and longevity. BMS (Battery Management System) is the main thing. Lithium batteries are sensitive to heating up, over charge and over discharge. There are "plug and play" lithium batteries you can get that takes out all of the guess work. They are PRICEY. Using batteries from cars is the most popular, because they are more affordable. However, this requires solving the guess work. There are many ways of going about this, the links I put here are just two examples. There are many more threads on here. Feel free to ask me any questions on my thread or PM. I'll answer any I can.

Thanks BBBHC great write up on your project well done.... Daves too.

[JohnnieB]

Originally Posted by PuttPutt

hope this worked log files attached.

Zipped files appear to be in an .xls format with locked titles. I prefer to start with the raw .csv (comma separated values) format, but they loaded okay with only minor anomalies.

Max speed on flat land was 24.9MPH and on the hills was 17.2MPH.
(If your tires are exactly 18.5" tall, divide motor RPM by 226.028 to get MPH)

Both logs had low battery flags set when armature was drawing its max amps.
Flat -- start voltage = 51.3V and dropped to 39.9V when 314.7A were being drawn for a 11.4V drop or 3.6V/100A.
Hill -- start voltage 50.4V and dropped to 41.7V when 212.7A were being drawn for 8.7V drop or 4.1V/100A. However, the sample rate on the hill log was 1/second rather than Continuous, so the actual min and max may have not been captured.


What Make/Model batteries?
What is XCT's Under Volt slider set to?

Was Turbo on or off during the flat land run? (Field only weakened to 3.3A.)

[PuttPutt]

Originally Posted by JohnnieB

What Make/Model batteries?
What is XCT's Under Volt slider set to?

Was Turbo on or off during the flat land run? (Field only weakened to 3.3A.)

US batteries US8GC XC2

not sure about turbo on or off so sent new files should be .csv


Cart was on the charger this morning on float.

[JohnnieB]

It appears that your cart is faster on hills with Turbo-Off while faster on flat land with Turbo-On. Of course, that assumes the cart was climbing the same hill with the same weight on-board for both of the hill logs.

Turbo-ON-Hill --- 16.4MPH --- Field - 6.3A
Turbo-OFF-Hill -- 17.3MPH --- Field - 7.4A

Turbo-ON-Flat --- 24.9MPH --- Field - 3.7A
Turbo-OFF-Flat -- 22.4MPH --- Field - 4.5A

Fortunately, the XCT has multiple user modes and you can program one for hills and another for flat land.

Here is a SoC chart for your batteries.

[PuttPutt]

Originally Posted by JohnnieB

Max speed on flat land was 24.9MPH and on the hills was 17.2MPH.
(If your tires are exactly 18.5" tall, divide motor RPM by 226.028 to get MPH)

Thanks JohnnieB

Went out set a level on top of the back tire and measured 18 3/16" or 18.188"
from the ground. Is that the correct way to measure tire height? original measurement was off a little.

I need to do some reading to understand what the field amps mean. I don't understand why with a 500 amp controller I do not see any readings close to 500. In the log files is current the same as amps? Battery current, motor current. Cart used to hit 6000 rpm on level ground but not anymore. Batteries are just under 100% on state of charge (after sitting a couple days off charger. is that enough to make 500 rpm difference?

[cgtech]

Field windings don't match battery amps or armature amps, it's always significantly lower.

To measure dynamic tire size, I put a chalk line on the tire, point it straight towards the ground, and make a matching mark on the ground, roll the cart forward until the mark points at the ground agaln. Measure the distance between the marks and divide that figure by 3.14159.