/diy/ - Do It Yourself

Thinking about making a variable/programmable load for testing batteries and power supplies, thoughts on my circuit? What do you think would be a reasonable voltage/current range to shoot for? I'm thinking having the ability to test loads ranging from 1v to 60v would be nice at around 20 amps max, maybe 30. Idk how easy that voltage range would be to manage without needing to switch between different load resistors. Also would like to be able to set and control for current, voltage, and power limits.
Mechanically, I was thinking of making the load resistor connect through binding posts or otherwise make it a seperate, external piece, so that I could make it water-cooled for higher power loads (by water cooled, I meant stick a power resistor in a cup of water and let it boil off).

Thoughts?