The cheaper voltage reducers are usually linear regulators. Current in = current out. If 48 volts in & 12 volts out, 3/4 of your energy is being dissipated in heat.
If it's got heatsink fins all over the outside, it is one of these.
Probably not much use to you, as shipping costs would kill you. Oatley electronics here in Australia have ex-telecoms switchmode supplies. 48 volts in & 24 volts out. 1Kw. The output can be changed to 12 volts fairly easily. They include a circuit diagram & instructions on how to modify (change a couple of resistors).
These supplies are used all over the world. Digging one up locally is a challenge I leave you to pursue.
Amanda
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