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If you make a stainless steel bus bar 4mm x 25mm and 100mm long, it will have a resistance of about 690 uOhms. If you are pulling 1000 amps that would be a voltage drop of 690 mV and power dissipation of 690 watts. The equivalent copper would be 16.8 uOhms and 16.8 watts.

You might be able to use copper water pipe for bus bars. Just use a press to flatten it for the terminations. 1/2" type L has a cross sectional area of about 0.08 in^2 which would make a 100mm bus bar with 33 uOhms resistance and a voltage drop of 33 mV and power of 33 watts at 1000 amps. 33 mV represents approximately 1% of the voltage of an LiFePO4 cell. 1/2" x 10ft type L pipe is about $14 at Home Depot, so you can make 30 bus bars for about 50 cents each.

It is a good idea to use silver plating (Kool-Amp powder) on bus bars for best conductivity of the joint. And some grease may also help avoid corrosion.
 
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