2five with Bob Boyce tune lithium conversion questions

[kabinski]

2019 EZGO 2five

I’m interested in this kit based on suggestions from other threads… https://www.epochbatteries.com/produ...y-complete-kit


Some questions:

1) Bob Boyce worked his magic a few years ago. Not exactly sure what he did technically, but it’s faster and has more torque. I know he tweaked the regen braking and a few other things, as well. Will any of this be an issue converting to lithium? Will any settings need to be reprogrammed?

2) Is this kit, and most others that are similar, just a matter of “plug and play” as long as I use the charger that comes with the kit? Or is there any programming of the controller necessary or required after the install?

[TheCartBoy]

With that kit: 240A Max Continuous Discharge (400A 10S Discharge) (800A 3S Peak Discharge)

The 2five has a 350 amp 1206AC motor controller, the 350 amp refers to the max phase current applied to the motor. The current pulled from battery is generally less, except in some operating conditions, maybe stalled motor? And even with that, you get some higher time limited current draw before the BMS will shutdown. You can put a clamping ammeter on your B+ lead and look at current draw during your typical drive, to get a better feel.

The issue with aftermarket lithium on RXV and probably the 2five, is the electric parking brake. If you exceed the BMS current limits, or some other protection mode kicks in and shuts off power, you lose all regenerative brake and the parking brake will lock up.

The voltage ranges are different between lithium and lead acid, but lithium is a smaller range within the tolerance of lead acid - so you should be free from under voltage and over voltage faults, the SOC meter isn't going to be accurate, but the kit comes with a new one.

If you can get a hold of a .CPF from your controller, someone here can help you identify what settings were modified - then you'd know where to look if something seems weird.

[kabinski]

Thank you for your time and insight. I was ready to pull the trigger on a new Liberty Elite lithium LSV, but I love the 2five and it’s been a great cart. I’ve contemplated the conversion for a while and after visiting the local EZGO dealer yesterday, even the sales guy there seemed to push me in the direction of doing the conversion. The chance of the parking brake locking up has me concerned, though. I had an RXV prior to the 2five, and with both there has always been a bit of concern with the brake locking up due to stories I’ve heard. We live at the beach and drive the cart everywhere we can. I’m not sure I want to put my wife and son at risk (even if small) in regards to the potential braking issue. I think you may have steered me back to the Liberty. Thanks again.

[TheCartBoy]

The Liberty is pretty nice, but it comes standard with a 235amp 1206AC controller. Only recently are they offering a 350amp upgrade, which is what your 2five came with standard.

Everyones risk tolerance is different, I think it's fairly unlikely to experience the brake lock up, and if you wear the seatbelt your not going to fall out of the seat... if you can find a lithium battery that offers 300 amps continuous, I think you'd pretty much rule out the possibility a BMS shutdown due to exceeded current draw.

[TheCartBoy]

One more thought, if the epoch supplied display gauge tells you how much current you are pulling and perhaps a warning if you are exceeding the timed limits, then you would know to slow down to prevent a shutdown. A built in warning alarm would be nice too, I don't see why they couldn't design that in.

[usgicollector]

TheCartBoy, the 2Five's came with a 235amp controller not a 350amp standard.

[TheCartBoy]

Originally Posted by usgicollector

TheCartBoy, the 2Five's came with a 235amp controller not a 350amp standard.

Oh didn't realize that. So the 350amp one was the upgrade.

In that case, OP probably won't have any issues with the epoch lithium kit.

[usgicollector]

There never was a 350amp controller that I know of for the 2Five.

[TheCartBoy]

676512g02
controller,1206ac,lsv,350a

Rare item I guess

[usgicollector]

It won't let you order one it say Oops! no product found for this SKU. I've never seen or heard of one myself. Maybe someone will chime in and if they do, I would love to see the CPF on it.