LHB - what is he even doing now

[Darkie02]

@longhairedboy

with my kweld and set the cable length to one meter and got nothing.

Be carful it’s not plug and play the length and thickness are critical to the resistance and calibration. Same with the battery if you pull over 2000A you will cause damage to the KWeld will shut down.

800A bare minimum
1200A recommended minimum (this is what the KCaps deliver)
1400-1600 is a good place (this is what dule KCaps deliver)

Holed the peddle down and it will tell you the result of the weld. That will give you a good idea of how the Old leads are

If your going to play around with the cables and battery’s I recommend you do a quick bit of maths

@tatus1969

It’s really just Ohm’s law. Desired current is 1500A. The resistance of the kWeld system is roughly 3.2 milliOhms (stock cables). The weld spot itself contributes another 1 milliOhm typical. This gives 4.2 milliOhms total. To push 1500A through that, you need U = R*I = 6.3V from an ideal battery. For every milliOhm of battery’s internal resistance, you need another 1.5V accordingly. Or in other words, for every volt above 6.3V that the battery has, it needs to have 1 milliOhm of internal resistance to stay in the sweet spot for the current. A 3S battery therefore needs to have 12-6.3 = 5.7 mOhms. Then calculate the power loss in the battery: P = 0.5 * R * I^2 = 6412 W. That explains why they heat up quickly, even though the pulses are short. Now consider a 6S battery. That must have an internal resistance of 24-6.3 = 17.7 mOhms. Then P = 19912W.