I’m getting worryingly uneven cell voltage after riding. I’ve literally only been out 4 times, but I think my wiring must be wrong in some way. Or perhaps may be too n00bish. Any help here is appreciated, I’d just like to know what others have done to solve this problem, as it must’ve already been seen.
1st, please take a glance at my build: -
I’ve got 5 5s LiPo packs, and I wire them in series to make a 10s1p. After riding twice, I noticed both times that the cell at the end was about 3.15V, and the rest were about 3.4ish, I didn’t think to note them all down at the time, but I know they were quite far apart. on the 2nd ride i noticed that one cell was at 3.01V, and some of the rest were quite higher at about 3.3/3.4 Best I’ve got is 5.5 KM with those battery’s, which isn’t very good really, but I wonder if that’s the drag from the wheels and relative large belt I’m using. I’m going to be asking psychotiller about this issue separately though (just want this thread about the battery ideally)
Thinking it might be the battery’s I’m using, or maybe that I just had one bad pack. I tried with 2x 6s graphene battery’s (222WH), which got me 8KM, but when I checked the cells (good job I did), 2 of them in pack one were at about 3.05V, and the rest in the pack 2 were quite higher at about 3.5/3.6ish.
It seems as if certain cells in a pack (the pack which is connected directly to the positive?) are discharging more than the rest, and it’s affecting my already disappointing range as i have to stop much earlier than I’d like
I’ve attached a pic of my wiring and my VESC settings below. However the VESC’s share an XT90 that splits the power, which gets wired directly to the battery packs.
I’m going to order a BMS from Bestech tomorrow, hopefully that’ll come soon. Is that the solution? Or can i wire it differently so that power is drained more evenly? Also, just a thought, but I was going up and down some hills in my 8km ride with the 12s graphene battery’s, could it be that the VESC is re-charging the battery’s wired closest to the negative from the VESC’s?
@Namasaki @psychotiller, sorry but I want to tag you in for your help, as I know you have builds using similair setups, and I could use some knowledge from veteran builders , I hope you can offer some insight into this.