Noob question thread! 2020_Summer

[bollen]

You should be able to squeeze in a unity and a discharge only bms at the end.
(TB40 12s8p 50E for reference)

@ThomasL

But you’ll need to widen the cutout a bit

@Chaki

Hey. Yes the 21700 cells are a super tight for or doesn’t fit at all. U have to make it wider if u go with 21700 cells. I do not recommend it if u don’t make it a bit wider. 5-10mm

[jcarlo]

I bought this flipsky one. Wires goes where they go at least to unity.

[Athrx]

I plan (well, hope for now) i can fit all p group connections on top with 90° nickel tab bends. In theory 2 cells head to head are 140mm and the cutout is 145. How terrible do i have to be with space management to not be able to fit that pack in? That comment says 5-10mm… with solders on the sides i guess?

[bollen]

It’s gonna be a tight fit but it should work. Might even be fine without widening the cutout if you do the 90° bends and flat copper braid.

[Leon]

Nah, if you’re using Nese, you’re fine with lugs.

[b264]

This covers cutoff voltages

ESC Battery cutoff settings

State your pack and cutoff settings Easy enough? I’ll start Lithium ion 12s6p 30q 37.8 cutoff start 34.8 cutoff end -----------‐‐------ 10s3p 25r 31.5 cutoff start 30 cutoff end

As far as current settings, there are lots of threads actually. Tons of reading

https://forum.esk8.news/search?q=vesc%20settings

If you list your

• battery geometry (aka “10S5P”)
• cells used
• ESC used
• motor used
• number of motors
• gear ratio (1:1 for direct drive)
• wheel size in mm

Then we can suggest some settings to get you started, you can tweak from there

[Stefan8888]

Thanks, here is a list.

10S3P (after a few weeks it will be 10S10P)
Sony VTC4 Li-ion
Unity Focbox
Torqueboards 6355 190kV
2
2:57
97mm

[b264]

@Stefan8888

2:57

does not compute

How many teeth on the wheel pulley/gear?

How many teeth on the motor pulley/gear?

[Stefan8888]

Sorry, that should be 2.57:1 motor pulley 14 And wheel pulley 36

[b264]

After doing motor detections, I’d try:

motor max 65A
motor min -50A
battery max 50A (both sides together since Unity, else 25A + 25A)
battery min -24A (both sides together since Unity, else -12A + -12A)
absolute maximum current 150A
Fault Stop Time: 70ms
Duty Cycle Current Limit Start 85%
voltage cutoff start 36V
voltage cutoff end 32V

to get started, and adjust from there. You should get getting somewhere around 27.2mph (43.8km/h) top speed like that.

[Stefan8888]

Thanks. Also, Isn’t voltage cutoff start and end too small? It should have voltage 2,5V-4,2V

[b264]

Is it 10S VTC5 cells?

36/10=3.6
32/10=3.2

[Flasher]

@Stefan8888

2,5V-4,2V

2.5v/cell is wanting a deathwish for your pack

[Stefan8888]

VTC4

[b264]

If it’s 10S, those cutoffs should work fine.

Otherwise, stroll on over here:

ESC Battery cutoff settings

State your pack and cutoff settings Easy enough? I’ll start Lithium ion 12s6p 30q 37.8 cutoff start 34.8 cutoff end -----------‐‐------ 10s3p 25r 31.5 cutoff start 30 cutoff end

[ethana4]

Alright, so I run a FOCBOX unity on my build. I like the Focbox UI setup, but it seems limited in the modifications that can be made to board settings.

Is there something I’m missing? I’d prefer not to have to go back to VESC tool, because I prefer the Focbox UI phone app.

[ShutterShock]

Mine is the same as this one, cutoff end at 37.8 for my 12s

[Lunartic]

Anyone know what this connector is called? Its from a OnewheelXR bms with 26 pins.

[jcarlo]

Look like it’s jst

[Stefan8888]

Once more, thanks!