# Searching a second hand high current DC power supply, DC Around 70V/2000A.

Discussion in 'Marketplace' started by ScottWang, Nov 8, 2017.

1. ### ScottWang Thread Starter Moderator

Aug 23, 2012
5,547
875
Hello:
A friends asked me to help him to find a second hand high current DC power supply.
If you know any messages about this, please give me a PM, thank you for your help.

Input : AC 380~480V
Output : DC Around 70V/2000A.

Motanache likes this.
2. ### GopherT AAC Fanatic!

Nov 23, 2012
7,520
6,254
Wow, 140k watts!

Is that for an electromagnet to swing the counter weight inside "Taipei 101" and topple it?

3. ### ScottWang Thread Starter Moderator

Aug 23, 2012
5,547
875
If you mean the Damper and its total weight of 660 metric tons, I'm not sure 140k watts is enough power to swing it or not, but the typhoon does, maybe you could using some math to tell me,

20150808 Sudi Le Typhoon struck rocking situation.

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4. ### Glenn Holland Member

Dec 26, 2014
486
196
Just guessing it might be some type charger for a large group of batteries.

Some of our transit vehicles have a battery charger that has a 615 VDC input with an output of 32.5 volts @ 400 amps.

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5. ### be80be Distinguished Member

Jul 5, 2008
799
132
Tall order there most with a 70 volt dc are hard to find above 500 amps

Could make one with one of these I guess

and some of these

Last edited: Nov 12, 2017
6. ### ScottWang Thread Starter Moderator

Aug 23, 2012
5,547
875
Thanks for the info.

But the voltage is close to 9 times and the current only 1/5, it's far from the required V/I.

7. ### ScottWang Thread Starter Moderator

Aug 23, 2012
5,547
875
My friend can't find the target power, so he tried to used some other methods.

8. ### tcmtech Distinguished Member

Nov 4, 2013
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2,615
I'm assuming this is for an application that need that power level for more than just a few minutes at a time?

If so, start looking around for high capacity constant voltage submerged arc MIG welding power supplies. I know for a fact that there are huge industrial production line power supplies that can do those numbers. Might cost you \$30K - 50K+ for a new one though.

The Miller GPS 1500 series units can easily do 70+ volts @ 2000 amps at 60% cycle and used units are not terribly difficult to find either.

https://www.millerwelds.com/files/owners-manuals/o267j_mil.pdf

Beyond that, finding older smaller model high capacity MIG power supplies that can do 40 - 70 VDC @ 500 - 1000 amps is not that hard. You would just need to get multiple units and gang them together in some combination to get the 70 volt 2000 amp output but they would do it.

9. ### ScottWang Thread Starter Moderator

Aug 23, 2012
5,547
875
My friend tried to used some more power supplies with lower current, but that is a big engineering.