The battery builders club

How-Tos & Esk8 mechanics
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#1855

How do I calculate that ? I have 2x 6376 160 kv motors

#1856

I would bypass the BMS for the ESC but discharge through it for lights or any accessory, using a loopkey on the positive side

4 Likes
#1857

Lithium-Sulfur sounds intertesting

https://spectrum.ieee.org/energywise/aerospace/aviation/lithiumsulfur-battery-project-aims-to-double-the-range-of-electric-airplanes

#1858

Number of amps per cell X number of parallel.
For example 30q 4p pack can deliver 80 amps

1 Like
#1859

On most not no.

This is on a kart track with diebiems which can handle 120amps.

3 Likes
#1860

I thought diebiems was only good for 80a?

2 Likes
#1861

Pretty sure itā€™s 120 amps. It does have an 80 amp fuse.

1 Like
#1862

Errrā€¦ how do you push 120a through an 80a fuse?

2 Likes
#1863

Just squeeze it on through :wink:

Probably didnā€™t last long enough to trip it lol

3 Likes
#1864

Short term amps. Actually it is 100 amps more or less.

Electrical specifications

  • Max load current +/- 100A for a short time, for long it is about 70A.
  • Max charge current 10A (with diode) or 30A (with diode bypass).
  • Cell voltage range 2.5V to 4.5V.
  • Pack voltage 12V to 54V

@JTAGG actually first mentioned it would do 120amps or that was the goal at least.

The tool did allow me to set it to 120amps.

2 Likes
#1865

Yeah i remember the goal being high like even 140a maybe.

2 Likes
#1866

The battery I have would then be able to deliver 160 amps, but Iā€™m never going to use that much, is it possible to set max amps in the vesc6?

#1867

Yes the vesc is fully customizable with how much power it drains and refills the pack with

You should read some articles or other threads as well. The a single thread shouldnā€™t be your only source for information because thereā€™s almost a million different ways to do/program/build something (maybe not vesc related, but certainly regarding the other parts of your build), and understanding those other processes can translate over to other esk8 tasksā€¦ Soon youā€™ll be a master :slight_smile:

^ this write-up is old, and needs updating. Li ion cells (18650s and 20700/21700) cells have great performance nowadays, but admittedly it still canā€™t always keep up to a lipo in terms of raw amps output )

(Imo) The most important settings for batteries in the vesc tool are probably the voltage cutoff, batt max and batt min. I always triple check these when Iā€™m configuring my vescs, and you should too.

E lmao I thought I was in another thread. Edited

5 Likes
#1868

IMG_20191107_133117_995
IMG_20191107_133117_9951440Ɨ2792 386 KB

IMG_20191112_210637_289
IMG_20191112_210637_2891440Ɨ2792 552 KB

IMG_20191112_212736_299
IMG_20191112_212736_2991080Ɨ2094 169 KB

Just wrapped up this beast a few minutes ago. 14s4p for my onewheel+. Fits in the laptop pouch of most backpacks. Made from recycled 30qā€™s from a pack that got some water damage. Stripped all the cells to bare, cleaned, individually capacity tested, re-wrapped, and put into this insanity battery.

Aiming for 50mi unloaded, 40mi loaded with all my camping gearā€¦ You see where this is going.

10 Likes
#1869

Awesome! The $400 153 mile onewheel just passed 600 miles! I wonder when I will see range decrease, maybe after a year of riding or two. Averaging 12 miles every day (450mi/38day).

Canā€™t wait to see your range numbers!

1 Like
#1870

Is this a charge and ride pack?

#1871

Yes, through a vamp style connection since the charge port wonā€™t let you charge once the external battery gets down to 80%.

1 Like
#1872

This needs a bump. Got mine a week ago and itā€™s fantastic.
Cheaper than a 4A laptop style brick from a US seller, yet infinitely better :star_struck:

1 Like
#1873

So, now that Nkon is no longer supplying our needs, whoā€™d the best/cheapest cell supplier for small batches here in the US?

#1874

Imr batteries or li ion wholesale. About 30% more then nkon though .

1 Like