Mad Machinist
Silver Member
I've been kicking an idea on this around amd finally got a chance to sit down and talk to my little brother about it. He's s the sparky so he should know.
So everyone has probably seen the videos on Boobtube about rewinding microwave oven transformers. Well, it pretty much works the same between AC and DC power as far as Ohm's law is concerned.
So get a 50 amp bridge rectifier from Amazon, preferably with the heating then follow the directions to hook up a 110 volt power cord.
Remove the secondary windings.from a microwave oven transformer.amd replace with 1.75 turns of 2/0 welding cable. Use welding cable as the insulation is rated for 105 degrees Celsius not the standard 60 or 90 degrees.
Feed the outlet terminals from the bridge rectifier into the primary coil of the transformer and viola! instant low voltage, high current power.
So 110 volts at.30 amps is 3300 watts. By Ohm's Law if that 110 volts is reduced to 2.2 volts then the current has to rise to make up the rest of the missing wattage.
So 110 volts times 30 amps equals 3300 watts divided by 2.2 equals 1500 amps. Now figure 75% conversion efficiency (low end efficiency) and you still have 1100 amps.
This is some very high power stuff so if you play with this you do so at.your own risk but basically this is just a bigger and badder battery charger.
Got some stuff ordered for when I can get around to this.
So everyone has probably seen the videos on Boobtube about rewinding microwave oven transformers. Well, it pretty much works the same between AC and DC power as far as Ohm's law is concerned.
So get a 50 amp bridge rectifier from Amazon, preferably with the heating then follow the directions to hook up a 110 volt power cord.
Remove the secondary windings.from a microwave oven transformer.amd replace with 1.75 turns of 2/0 welding cable. Use welding cable as the insulation is rated for 105 degrees Celsius not the standard 60 or 90 degrees.
Feed the outlet terminals from the bridge rectifier into the primary coil of the transformer and viola! instant low voltage, high current power.
So 110 volts at.30 amps is 3300 watts. By Ohm's Law if that 110 volts is reduced to 2.2 volts then the current has to rise to make up the rest of the missing wattage.
So 110 volts times 30 amps equals 3300 watts divided by 2.2 equals 1500 amps. Now figure 75% conversion efficiency (low end efficiency) and you still have 1100 amps.
This is some very high power stuff so if you play with this you do so at.your own risk but basically this is just a bigger and badder battery charger.
Got some stuff ordered for when I can get around to this.
