Running 36v TSDZ2b at 48v?

[gromike]

I thought I saw a post somewhere that said you can run a 36v TSDZ2 on 48v. Searched for the post, and I can't find it. So, my question is can you overvolt a 36v TSDZ2b to 48v, and what would need to be done on the controller's settings? I have a bunch of 4s/2p batteries arriving next week, and I'm planning to string four together in an experimental pack and power my 36v TSDZb with 48v and see what happens. Though it would be nice to know of other experiences. Don't want to unnecessarily make smoke.

 

[harryS]

I've read that the controller is the same, whether it is 36V or 48V.. The TSDZ2 firmware determines whether or not to set an alarm for overvoltage. When users install the OSF software, they can set whatever voltages they want. So I believe you won't smoke anything, but the factory firmware may limit your voltage.

Are those 4S-2P pacls LiFePO4 or Li-ion? 16S of Li-ion is over 60V. That would smoke your TSDZ2. If you're doin three in series, that's only 44 volts. If these are LiFePO4, then never mind.

I've lowered the low voltage limit with OSF on my 48V TSDZ2 so it can run on 10S batteries, but performance seemed pretty weak so I gave it up.

 

[gromike]

Thanks Harry, I'll plug it into the 48v pack. The cells are LiFePO4's, so I'm OK in that regard. Getting into the software side of ebikes will be new to me. So far, all I've had to do was bolt up and plug in, with a bit of cut and solder. That bike with the TSDZ2 has been nothing but trouble, but I suppose that's to be expected when you build a bike from a pile of mostly free parts.

 

[EMGX]

My understanding is that all of the controllers are the same device with different firmware so to run 48v on a 36v setup you'd have to either do the open source parameter programing or replace the controller with a 48v programmed unit. I did hook up a 48v battery to my 36v version, the display would light up but the motor wouldn't function using a throttle that I hooked up for test purposes. Also the 36v motor windings are different than the 48v motor version. At one time Eco-Cycles told me it would work with a 48v controller but run faster and hotter and support a higher pedaling cadence than the standard 90 rpm cadence support limit.

On a different but related subject I can say that my 48v version (purchased from Eco-Cycles) runs without issue on 58.8v battery (a 48v LiFePO4 that charges to 58.8v)