>> The reason I am asking is that I'm wanting a (cheap secondhand) DC power supply
>> that can maintain 40 to 50A at ~13V.
I have no idea what you are planning that needs a maintained 50amps of 13 volts!!! Used to build 50 amp power supplies back int the days of pirate ham radio and 1kw transmitters, using big torriod transformers.
Anyway, if 50 amps is peak not working and cheap is the name of the games, A 12v caravan leisure battery and charger is the way to go. YOu may look at 3d printer or laser engraver/cutter spares, think they use large amounts of 13.8v dc.
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