The battery builders club

[JoeyZ5]

@BenjaminF

I just spend way too much time on that part, therefore drag down my total $/hr, and get myself one step closer to bankruptcy

Understandable

Also I didn’t really realize how tiny this 10s BMS is… compared to every other DALY I’ve used it’s microscopic

[ShutterShock]

Yeah bro I got one of those from @A13XR3 and I was like dang… I am not using a different 10s non smart bms again after seeing how small it was.

Idk what it’s max charge rate is though

[JoeyZ5]

@ShutterShock

Idk what it’s max charge rate is though

Mine says 8A.

[A13XR3]

Yeah 8A. I regularly use them at 5A and they’re not warm to the touch. But I’ve never built a big enough 10S pack to warrant buying an 42V 8A charger.

[Alpacaslapper]

Link to said bms? I need a few

[JoeyZ5]

You can get em from @BenjaminF (www.duckbatterysystems.com) or @A13XR3 (PM him)

[ShutterShock]

Yeah, I mean 8A, if the charger even delivers it…

My “6A” YZ power seems to only deliver 4.5a most of the time even at low state of battery charge.

Not sure why. This is on a 12s7p battery too. It still probably only takes 2hr to charge though which isn’t bad

[ZachTetra]

My 2A clocks in at a whopping 2.21A

[JoeyZ5]

@BenjaminF

I definitely agree that seeing a really neat harness come together is very satisfying.

[ShutterShock]

You’re so extra man but I love it lol

[joshoujoe]

That’s battery builder’s porn right there

[ZachTetra]

As a little tip it’s easier to shuffle the order of leads going into that first connection than anywhere else, it’s low profile but you never have crossing leads at the top of the pack (more brain work to make sure it’s right, but also a little more robust in theory). Work is pristine though! Whatcha using for that center divider, looks like some thin black plastic?

[JoeyZ5]

@ZachTetra

As a little tip it’s easier to shuffle the order of leads going into that first connection than anywhere else, it’s low profile but you never have crossing leads at the top of the pack (more brain work to make sure it’s right, but also a little more robust in theory).

I might be misunderstanding this but its probably because I’m tired… but you mean shuffle all the leads into the correct order here so that they don’t cross over at on the top?

@ZachTetra

Whatcha using for that center divider, looks like some thin black plastic?

It’s a 1mm solid PETG divider I printed out. $0.11 of filament and was a perfect fit

[pmg]

@A13XR3

very few if any standard BMS we use could balance a .1V delta.

How much would the maximum be by your experience?

[pmg]

@JoeyZ5

12s6p P42A

Looking clean
Will you be wrapping it with heat shrink when you’re done? I’ve been wondering whether to do that with mine, think I don’t have that extra mm to spare…

[JoeyZ5]

Yea, I’m doing that first thing tomorrow. I’ll send pictures then.

Edit: I fused the charging port after taking that image. Don’t forget!

[Battery_Mooch]

@A13XR3

Most BMS’s maintain balance state they do not fix out of balance packs. I would say very few if any standard BMS we use could balance a .1V delta.

Even with enough time? Most BMS’ only balance during charge so fixing a 0.1V delta just won’t happen?

[pmg]

@JoeyZ5

fused the charging port

Do these 32V rated automotive fuses on Amazon work also on 12S or what do you normally use?

[Halbj613]

yes apperntly voltage matters very little more about amps

edit: @Battery_Mooch has told me i am wrong
look below

[Battery_Mooch]

@Halbj613

yes apperntly voltage matters very little more about amps

This is not true, voltage matters.
Of course the current rating matters but you must use a fuse with a high enough voltage rating to prevent arcing across the gap when the fuse blows.

Pay attention to whether the rating is for AC or DC voltage too. For esk8 use you need a high enough DC voltage rating.

@pmg

Do these 32V rated automotive fuses on Amazon work also on 12S or what do you normally use?

No, do not use 32V rated fuses for a 12S pack. Use a fuse with a DC voltage rating higher than 50V.