Thanks.Max current at any voltage is 10A. Why do you need so much power? Most are satisfied with 30V, 3A bench power supplies.
Thank you for so detail.What you are asking for is either very-large, or very expensive, or both.
Prices start at at least ~$200.oo for clean, Regulated Power in that range .......
Do you really NEED that much Current/Power ?
If you want a cheap DIY High-Power-Supply,
start out with a MOT (Microwave-Oven-Transformer),
which you can get from any "Thrift-Shop".
2-MOTs would be ideal, because they generally don't have
enough Inductance in the Primary Windings for efficient operation.
( they need to be fed half of their rated Primary-Voltage, i.e., 2-Primaries in series )
Then wind your own Multi-Tap-Secondaries with ~10-gauge, THHN insulated, Stranded-Wire,
and provide high-Current-Connectors for selecting
the various Voltage-Ranges that you expect to need.
Now that you have High-Current AC,
you need to convert it to well-Filtered-DC, which is not as easy as you may think.
( a third, completely stripped, MOT Core, makes a great Inductor-Core for part of the Filter ).
Plus ~$50.oo to ~$150.oo worth of Bulk-Storage-Capacitors.
Then you need to Regulate the DC-Voltage, with a serious Linear-Voltage-Regulator,
and, provide adjustable Current-Limiting,
and, Meters for both Voltage and Current,
and, a nice fat Heat-Sink for that ~100-Amp Linear-Regulator,
and, Cooling-Fan(s) to keep everything happy,
and, an Aluminum-Box to put it all in.
This will create a Clean Power-Supply capable of a continuous and comfortable ~500-Watts,
with maximum Current of ~50-Amps.
If you're really dead-set on this, I'll show you how to pull it off,
but first, make sure your specifications are actually what you need.
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by Jake Hertz