I have about 400,000 uF @ 70 - 80 volts in my welder and I don't think twice about turning it on.Generally, you don't need the slow turn-on. I have essentially 40,000 uF at 50 V in my amp and I NEED the slow turn-on,
Until a problem actually presents itself it not actually a problem.The theory doesn't take into account all that is possible due to ignorance. In my case I expect a surge, but I want to be on the safe side to avoid blowing fuses because I don't know the actual draw and duration.
tcmtech, I assume those tools could have their own soft starts built in, if not they at least had the brains behind them knowing how to make it work. I don't, so I thought I'd play it safe with a simple soft start circuit. I've always thought those billions of other circuits out there had soft start features because of all of the extra components involved in the power supply area. I do have experience with 1500-8000uF causing problems with circuits not designed by me. One very unusual experience was connecting an 8v lithium battery to an ESC with 1500uf and I think no motor was attached. I didn't use the soft start resistor and got a huge pop and in less than a second the 10AWG battery wires were hot. That's where I'm coming from.
Anyway I think I may have found the problem, so I'll rearrange my components and might try without any soft start too.
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