esk8.news esk8 calc donate now

Conductor Current Ratings [SRO]

I’d like to make an easy-to-find list of current ratings for esk8 use.

If anyone has edits, corrections, experience, or thinks it can be better, please describe what you think should be changed. :smiley:

Popular esk8 sizes in bold.

This chart is labeled for continuous and not instantaneous. You can pretty much double every number for instantaneous, for a couple seconds or less.

search keywords: wire, AWG, size, nickel, current, ampacity, hot, melt, battery, amps, amp

Here are some various connectors below

48 Likes
The battery builders club
Silicone wire size vs withstand current (wire amp chart)
Copper braid as phase wire?
The Blue One | 12S LiFePO4 | 170kv TB 6380 | Caliber 2 & BN184 | 30.43" Powell-Peralta | TB110 | FOCBOX [Serious]
Jet Killshot 40.5 Community Sourced Build
The battery builders club
The battery builders club
Noob question thread! 2020_Summer
Noob question thread! 2020_Summer
Archived: the OG noob question thread! :grinning:
The battery builders club
The battery builders club
Archived: the OG noob question thread! :grinning:
Reply to "Pictures and nothing else" thread
[Wiki]Building a battery (SERIOUS)
Silicone wire size vs withstand current (wire amp chart)
Archived: the OG noob question thread! :grinning:
A123 LiFePO4 Cells - the iron man’s battery
The battery builders club
Help finding 14s 50.4v lifepo4 bms
The battery builders club
12S-3P Battery module
Making a modular battery - FAIL
The battery builders club
How to make an XT90S loopkey [SERIOUS]
MeeOwn “Zhong” 中国 Board | Ownboard ESC + Hubs | Meepo enclosure | old school deck | DIY 10s2p 25R
What grinds your esk8 gears?
Noob question thread! 2020_Summer
The battery builders club
Copper braid as phase wire?
Noob question thread! 2020_Summer
Noob question thread! 2020_Summer
Best wire type?
The battery builders club
The battery builders club
Changing Charger Connector. Safety Question.
The eBomber | Bustin Sporster | XTLA mounts | SR RKP | eBoosted sporster enclosure MK3 | Maytech 6365 | Bergmeisters
Noob question thread! 2020_Summer
Noob question thread! 2020_Summer

Thanks @sebaszz

Thanks Lund Instrument Engineering
https://www.powerstream.com/Wire_Size.htm

Thanks esk8.news

4 Likes

Maybe include voltage/power loss? :thinking:

Length of all materials is “less than one meter, for esk8 use” :smile:

So, the length of a longboard maximum. Obviously, shorter is better.

3 Likes

I was thinking detailed ratings like that are available but I wanted a condensed, easy-to-use, especially for n00bs format.

This is specifically-as-relating-to-esk8 only and not intended for other uses.

There is a calculator for all that if you follow the Lund Instrument Engineering link above

1 Like

Shooting from the hip, I would limit that to 30A continuous, 55A peak.

I would strongly recommend silicone-insulated fine-stranded copper wire for that. It will hold up to vibrations much better.

Might as well add common connectors. Jst xh/ph, bullet, xt, dc barrel, etc.

3 Likes

Never mind the extremely informative and concise post, what I want to know is why the double zero in noobs. Is it because noobs looks a bit like boobs if you use 2 o’s

Brian you old perv

6 Likes

@b264
You sir, are a Gentleman and a Scholar.

2 Likes

That chart for nickel strip is a bit underated just as every other chart is, one strip of 0.15 x 10mm pure Nickel can handle a lot more than 6.71 amps without heating up.

3 Likes

If you follow the Lund link in the second post, there is one :smirk:

This chart is labeled for continuous and not instantaneous. You can pretty much double every number for instantaneous, for a couple seconds or less.

I added this to the first post.

1 Like

Good thread. One thing i would like to know is the amount of current going through motor phase wires.

Lets say your motor max is 90a but you have 3 phase wires. is it a simple 30a per wire? or does it cycle 90a per wire very quickly?

It’s 3 phase AC so it cycles between all three in a rotation. Each one is probably “on” for two-thirds of the time.

1 Like

When building a battery, am I correct in assuming that these ratings only matter for the series connections as the p connections are only for balance?

This is 0.15 x 12mm nickel, so with 13 x series connections at say 8a per connection I should be good for 104a continuous… would like it to comfortably be 200… am I better to solder some wires across or double up all the s connection nickel?

And then for battery pos and neg, it should be fine to just run multiple copper wires to BMS to allow for 200a?

3 Likes

Do you want a 200A continuous battery? What do you want?

I want it to be capable of 200a continuous. I understand that it will never reach that, but this is a dick swinging activity.

4 Likes

Five 12AWG wires for each series connection (spread evenly along the nickel) would deliver that. And on the B+ and B-, five 12AWG coming from the nickel and then combined into a single 0AWG would make for a 200A continuous connection that would run cool.

Complete overkill for any esk8. But it’s what you need for 200A continuous, 400A peak

3 Likes

You would need a wire of this size
image

1 Like

Could I just run multiple wires to the BMS rather than connecting to a single monster wire :sweat_smile: i have 8awg on hand so I could use 3 of them for 210a?

1 Like

Yes :slight_smile: