i wanted to share my just finished 30min diy discharger project.
some xt60 male/female plugs
some 14awg wire red/black
4 m4x15 screws
2 100w 6ohm resistors
one used artic copper cpu cooler (did fit a athlon cpu)
overview of the whole arrangement:
the two resistors where installed where normally the cpu is. put aside of each other, drilled 4 holes into the cooler, cut a thread, put some thermal grease on the surface and screwed the resistors down with the 4 screws.
then the resistors very soldered in parallel to get them down from 6ohm to 3.6ohm. unfortunately this is a bit too high. the correct value to use all 200w discharging power would have been 2.5ohm. then attached cables to put the resistor in line in the positive discharge wire.
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P=U*I 200W = 25V * Amp Amp = 8A U=R*I 20V = Ohm * 8 Ohm = 2.5Ohm
this is the result. icharger 206b with resistor in-line. discharge power up to 150w ~ 7a
active cooling is a most (temp got >100°c). i took 13.8v from the power supply to feed the fan, as i think 25v is bit too much on the long run. or could that work? i was too much afraid to try for more than 2min.
now temp is >80°c
on the side you can't touch it for long, but you want hurt your fingers
let me know what you think