Bulk Battery Charger (aka Bad Boy)

[kittydog42]

I want to make a battery charger to bulk charge a bank of 240 volt flooded ni-cads. I want to charge at a max of 50 amps using a bridge rectifier and capacitors only, and maybe a switch to control the current by introducing a resistor into the circuit.

1. What kind of diode is rated for this voltage/amperage? I am guessing the DC voltage will basically be 240 times 1.4, or around 335.
2. What size capacitor? I was thinking 2000uF. Maybe the capacitor is not that important since I am only charging batteries.
3. What size and value resistors if I wanted to limit the current to 10A, 25A, or 40A?
4. Is there any simple way to lower the output voltage at the required amperage?

Any ideas would be helpful.

 

[Nigel Goodwin]

For a start you need to enter your location in your profile, and explain where you're going to get 240V at 50A from?. You don't need a capacitor though to charge batteries.

 

[Hero999]

You need a three phase supply for that sort of current, forget about using single phase.

What do these batteries power?

A small car?