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Nah sorry havenāt ordered any yet
My plan was to use 12mm x 0.2mm nickel for mine but itās lost in ali-express shipping land, ordered it 5/11 lol
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I would go with the 35e or 30q
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LMFAO the struggle is REAL
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NGL I have received 5 other ali express packages since then, all ordered significantly after that one lmao
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Letās seeā¦ Dinner table that doubles as a work station lol
And then some progessā¦ So I guess about 75% complete while I wait.for the replacement cell and bmsā¦ But main chunk done otherwiseā¦
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bump
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Itās definitely getting there, they means your BMS canāt balance so the problem will get worse. Manually balance it and go from there and you might be lucky but I would replace the BMS
Ah gotcha. Thatās what Ill do then. Ugh I wish all BMSās would just agree on a jst connector size. I dont feel like redoing it.
Thanks!
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donāt huck it just yet.
manually balance through the balance connector and see if the BMS can keep up with it. If the magic smoke is still inside, and it charges, itās probably still working.
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Hi guys! Iām assembling my first board soon (and consequently my first battery pack soon), and I was hoping I could get some feedback. Iām making a single stack 10S4P battery pack from Samsung 30Qs. Each battery group will be laid next to each other. How does this look? I would love some criticisms/corrections.
Is the wiring correct for a (discharge) bypassed BMS?
Are 4 wires between each serial pack overkill? / Is the serial connection between packs 5 and 6 overkill? (would one or two wires be sufficient?)
Should I have any fuses between the battery pack and connection to the FSESCs? I heard this is a no no, since if the fuse blows, you have no breaks. Plus the FSESC will shut off on its own when there is too much voltage/current.
Do the balance leads belong on the negative side?
It seems like this BMS comes with 11 leads (correct me if Iām wrong). Does the āb-ā lead go to the negative end of the first battery group in the pack? There also seems to be a āb+ā connection. Where does this go?
I came up with my diagram based on these:
b264ās diagram
The BMS I used
The fuse(s) I used
The charge port I used
I will be charging 42V @2.5A, if that helps/matters to know.
I plan on adding a light circuit in the future. A voltage step down is needed, correct? (Link: https://www.amazon.com/Pololu-Step-Down-Voltage-Regulator-D24V6F5/dp/B016VG8XI2)
If youāve come this far, thanks for reading!
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Looks decent, I would say 4 wires for 10s4p on 30Qs is way overkill, probably 2x 12AWG is plenty
The rest of it checks out. Donāt need to fuse your Vescs at all, the charge port fuse is good tho
That is how you wire for bypassed discharge too, so good on that.
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Awesome! Thanks for all your input, youāve been so incredibly helpful!
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I rarely see fused vesc in pictures or diagrams.
But my VESC is fused. it blew a fet horribly. and is currently directly shorting itās powerleads and blows the fuse.
I get curious how much more smoke would come out if that fuse was not there. or if it would lead to fire.
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Hm yeah yours was the worst fet explosion Iāve seen haha crazy that it shorted the power leads. Never seen that before
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Interestingā¦ Iāll consider placing fuses for each FSESC then, thanks!
Just keep in mind if you manage to spike above the fuse amount you could lose your braking entirely. I donāt think itās wise personally, and I think fessy got unlucky
@fessyfoo what rating was your fuse
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I might be wrong about this, but if the fuse were to pop that would be the equivalent to unplugging the ESC during operation. And iirc that guarantees a pop.
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Thatās why I donāt think itās a good idea, especially if itās on CAN, that guarantees both of them dying if itās 4.20 hw as far as I know
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