Comments on: How to step up amps and step down current from a 20,000 v dc down to 144 v and up 1-3 amps from capacitor? https://www.electricvehicleinfo.com/building-electric-vehicles/how-to-step-up-amps-and-step-down-current-from-a-20000-v-dc-down-to-144-v-and-up-1-3-amps-from-capacitor.html Electric Vehicle Information Resource Sun, 20 Feb 2011 01:03:40 +0000 hourly 1 https://wordpress.org/?v=3.8.41 By: Martyn G https://www.electricvehicleinfo.com/building-electric-vehicles/how-to-step-up-amps-and-step-down-current-from-a-20000-v-dc-down-to-144-v-and-up-1-3-amps-from-capacitor.html#comment-212 Tue, 16 Nov 2010 09:31:37 +0000 http://www.electricvehicleinfo.com/building-electric-vehicles/how-to-step-up-amps-and-step-down-current-from-a-20000-v-dc-down-to-144-v-and-up-1-3-amps-from-capacitor.html#comment-212 If you try to engineer this with a 20,000V supply, you will most certainly kill yourself.

I used to work in an electric vehicle development lab. Believe me.. you do not want to be doing that at 20,000V.

As it is, there are no sensible semi-conductor devices that can handle switching voltages like that. If you have a 20KV supply, you will get transient in excess of 60KV. This means ANY inductance other than that you intentionally put there will be radiating radio spectrum interference and causing horrendous unreliability.

It is much easier, safer and reliable to use a 135V battery pack (10 x 12V batteries, which have 13.5V unloaded, hence 135V) .

The converter will do the conversion to the motor operating voltage. I assume you have selected a motor that suits the controller.

]]> By: JavaScript_Junkie https://www.electricvehicleinfo.com/building-electric-vehicles/how-to-step-up-amps-and-step-down-current-from-a-20000-v-dc-down-to-144-v-and-up-1-3-amps-from-capacitor.html#comment-211 Sat, 13 Nov 2010 09:09:29 +0000 http://www.electricvehicleinfo.com/building-electric-vehicles/how-to-step-up-amps-and-step-down-current-from-a-20000-v-dc-down-to-144-v-and-up-1-3-amps-from-capacitor.html#comment-211 72000 watts ?
I hope you have the power company behind you !
LOL !

]]> By: billrussell42 https://www.electricvehicleinfo.com/building-electric-vehicles/how-to-step-up-amps-and-step-down-current-from-a-20000-v-dc-down-to-144-v-and-up-1-3-amps-from-capacitor.html#comment-210 Fri, 12 Nov 2010 07:54:35 +0000 http://www.electricvehicleinfo.com/building-electric-vehicles/how-to-step-up-amps-and-step-down-current-from-a-20000-v-dc-down-to-144-v-and-up-1-3-amps-from-capacitor.html#comment-210 How are you making this 20000 volt capacitor? Capacitors do NOT have current ratings, they have capacitance ratings, in farads. How are you going to charge it?

No, the controller will not work with voltages above 144 volts, and will be damaged.

It is very difficult to step down DC voltages from 20kV to 140 volts, as semiconductors tend to die above 500 volts.

diodes and wires won’t help.

I think you need to take some courses in basic electricity and circuits before you kill yourself.

If you are serious about this, work with 100 volts, not 20000 volts. Capacitors are much more efficient at that voltage, and your controller will work with it fine.

I’ve answered similar questions from you before. You are going off in some strange directions, with limited knowledge. Last time it was a 2000 amp capacitor.

I repeat, capacitors do not have current ratings, they have capacitance ratings in farads, microfarads, nanofarads, etc.

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