The 48-volt charger can be changed to a 12-volt charger using the transformer step-down method.
< br >
If you want to step-down a 48V charger to 12V, you need to use a transformer with a step-down ratio of 4:1, that is, the turn ratio of the transformer is 4:1.
< br >
In addition, the voltage reduction of the charger can be realized by the way of series voltage division, and the output voltage can be adjusted by the sliding rheostat in series in the total circuit.