12V ~3000W Power Supply

You do not say how long the test runs. What about several Sears Die Hards in parallel.

It is not easy to get a 211A @12 power supply. The only thing that you can do is to construct yourself a 12 Vdc power supply. It can be easily done by using a 3500VA step down transformer with some high ampere rectifier and some capacitor for filtering network.

The step down transformer should be 110V or 220V/12V/3500VA. It depend if you have 110V for the primary side or 220V for the primary side. Add some MCB or MCCB for the safety protection against short circuited.

Since your post don't indicate any requirements about the variability of voltage and current. In that case you can get a transformer with desired current and voltage ratings, and connect with bridge rectifier and big capacitor bank.

Regards.

When ever I need high current at a low voltage the constant voltage output on my welder works just fine for me.

Most MIG welders have reasonable regulation and with out much if any work they can be set up to do 12 -15 volts at several hundred amps. Just use one as a massive battery charger with one or two High capacity marine or deep cycle batteries as the smoothing filters.

Its as cheap as your going to get and still work well!

You must talk with the people of Dynapower. They have rectifiers power supply bigger than your needs and also they have switching power supply.

Doug Delaney
Dynapower Corporation
(802)652-1362

or

Michelle Trudell

Executive & Sales Assistant

DYNAPOWER/RAPID POWER CORPORATION

(802) 652-1315

Or you can check their web page at dynapower.com

I hope this helps

Jaime

APDC power supply sells new and refurbished power supply.

You can check this address

http://www.apdcpowersupply.com/products/index.php?controller=category&path=24

They have a unit with output of 12 Volts, 300 amp, with input 240 volts 3 phase power supply

Jaime

What about a simple rack of lead-acid batteries in parallel?

How about an industrial battery charger. Some of those can have an output up to 400 amps. One that could charge an 12 volt industrial battery may come close. You may have to do some circuitry modifications. Visit a used equipment dealer of forklifts.

Thank you all for the valued comments.

I think we are going to run the tests in a series of steps, which will eliminate the need to apply any power to the electric motors. But if by chance we do need to run a full system test, I'll just use a battery bank.

Thanks again!

If you choose to use battery bank for your test, then use adequate capacity battery. 200 Ah battery WILL NOT deliver 200 A for 1 hr. & you cannot adjust the voltage applied to the motor/load.

Thanks and regards

Ashok Toshniwal, Bangalore, India

The welders that you currently have should be usable if they have a 12 volt or close output. There are sealed lead acid batteries used in UPS units that could be grouped together to reach your amp load. BUT, most of these units are small, and would require so many batteries, that it would be impractical. There are group 31 batteries that are designed for deep cycle use. Two of these should get you to the capacity you need. The other choice is n 8D. These are huge, and weigh over 130 pounds. I think the idea of the welder connected to a group 31 battery would give you good performance.

One other option would be to use 2 125-150 amp power supplies connected to a single battery, running to your device. Good luck.

A group of car battery is your best bet and probably much cheaper then a power supply.

Advanced Battery Supply co of china offers 3.2V cells at 100 up to 1000 Amps/ cell. They also have 10 Amp cells as well check out www.splendidbattery.com And NO I do not have any stock nor am I associated with this company except that I did purchase some Li Poly batteries from them a year ago ) thus 4 cells in series would give you 12.8V@ 100 Amps or 1280 Watts . The batteries do cost about 150 dollars each. Plus you will need to purchase the proper charger. LiFe batteries are more expensive then LIPoly batteries, but are safer to use. HLG

Here is crude but very cost effective method. Take two metal plates and one small plastic container. keep two metal plates few inches away and connect firmly to the power supply. Now pour some water in to the plastic container and switch on the power supply under test. Now start brain solution or salt to the water watching current; go adding salt to increase current; if still current is less then you need large metal plate area or bring plates more closer. hope you got it by now!

HaHa.. Good one, But I don't think HHO will solve this problem, let alone any others!

We have Decided not to spin the 12V high current motors. We are going to leak/function test the manifolds on the test bench, and leak test the reservoir.

Long ago I had to conduct load test a 3Ph Diesel generator. So I used 200 ltr drum salt water and three iron rods to load test successfully. I am working in large VRLA manufacturing plant. We use many types of discharges/ load banks (voltage rating 0~400VDC and currents 0~10,000 Amps)