XM3500 Added Battery and Fuel Gauge Mod
Thanks for the info on the grounding issue, I wasn't too sure how it would work.
Grandpa Chas S.
I´ve been considering doing a 24 cell mod on a 3500, is anyone running on 24 cells out there using the original controller?
Yes, I've got over 6000km of 24(48mph) and 28(54mph) cell operation with 3 different 3500s. Just don't go crazy with it and you'll be fine even at (28cells 54mph). I don't know about big long hills on a hot day though. On second thought I ASSUME NO RESPONSABILITY. But that has been my experience.
Thanks, promise I won´t blame you if anything goes bad ;-)
I made the 24 cell mod after about 450 (actual) miles, which got me up to around 51 (actual) MPH. I used a 24 cell charger (from Elite Power solutions) and a BMS (designed by EPED). The extra cells were added to the positive side so that (as I understand it) the controller and 12 volt circuit were bypassed. I noticed that the added 4 cells were ahead of the other cells in the charging process. (The BMS was very helpful in keeping the added cells from overcharging). After 1,300 (actual) miles there were no issues at all. (Please keep in mind that this is at your own risk.)
I am working with a 24 cell mod on my XM3500 now, it looks easier to connect the cells to the negative side of the back.
I wonder if that would work as well to bypass the controller and 12 volt circuit?
Cells to be added on top of the big battery box
Cells placed on top of the other cells to test the idea with side mounting plates
If you ever blow the controller get a kelly or a curtis with regen. Regen braking is really nice. It's pretty easy to replace. You're goin to like that it's a big difference. I have mine on the negative side and have had no problems.
I did the first test drive with the increased voltage last night, and all went well. The top speed has increased about 10 km/h.
The volt meter is not adjusted yet, I have ordered some resitors to try to fix that.