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Electric Sprint Kart
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Discussion Starter · #1 ·
For anyone interested, I wanted to find out what the delay time for pre-charge is for a KLS14401-8080IPS, so I sent this question into Kelly:

Since the internal capacitance is not listed, with a KLS14401-8080IPS using the suggested 2K 20W resistor?

Their response:

The capacitance is 5160uF.

Given that, the basic RC time constant is 103ms, but that is only to 63.2%. To get near 100% multiply that by 5 up to 516ms. So a little over a half a second is how long you should wait for pre-charge before opening the HV contactor(s).
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