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Jehu PCB XT60 vs Brass Standoff
#1
hi, just received it. One point I do not understand with this bcb, the current can go through the xt60, that's ok, and also via the brass standoff, is this just to be able to provide the necessary Amperage? Thanks, Chris
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#2
(11-29-2018, 06:11 PM)chris669 Wrote: hi, just received it. One point I do not understand with this bcb, the current can go through the xt60, that's ok, and also via the brass standoff, is this just to be able to provide the necessary Amperage? Thanks, Chris

Some users have tested the brass standoffs and found the resistance they have is negligible, and shouldn't have any issue with high current (I would still limit the PCB stacks to 10 boards or less). Initially based on some calculations of wire gauge/ampacity vs. the brass standoff cross sectional area I thought the XT-60s would be needed to carry extra current, but the limiting factor was the cell holders (4A max), so it was not an issue. The XT-60 can still be used as a "top of stack" connector for pulling power from, if you don't want to use a screw terminal.
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#3
In fact, knowing how thick and short the brass connections are, I would first worry about the XT60 connectors burning out before the brass standoffs do Smile

Well, if you are running 10+ of these Big Grin
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The power of lithium ion is in our hands!
We'll show them what we're made of!
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#4
(11-29-2018, 08:48 PM)rev0 Wrote:
(11-29-2018, 06:11 PM)chris669 Wrote: hi, just received it. One point I do not understand with this bcb, the current can go through the xt60, that's ok, and also via the brass standoff, is this just to be able to provide the necessary Amperage? Thanks, Chris

Some users have tested the brass standoffs and found the resistance they have is negligible, and shouldn't have any issue with high current (I would still limit the PCB stacks to 10 boards or less). Initially based on some calculations of wire gauge/ampacity vs. the brass standoff cross sectional area I thought the XT-60s would be needed to carry extra current, but the limiting factor was the cell holders (4A max), so it was not an issue. The XT-60 can still be used as a "top of stack" connector for pulling power from, if you don't want to use a screw terminal.
Ok, I've seen now on the board they mention Aluminum 8mm hex M4 for 20 modules in stack. But If I dirty compare to AWG1 7.34mm is 119A, I could easy go to 30 modules (3A per board) , assuming the fact I will never exceed C1 for these cells and my inverter has a transfo that will not exceed 3000VA (230VAC for off grid household) and max power would be used for a duration of 10 minutes max. Please do not hesitate to correct me!

Now I'm lost, I can read aluminum has better electric conductivity than copper and in some other places copper has better conductivity, what's right?

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#5
Copper is always better than aluminium.
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The power of lithium ion is in our hands!
We'll show them what we're made of!
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