DC to Dc converter 130-90v input ~ 12-14v output

[steveo]

I typically like using a ac to DC laptop adaptor as a per say an alternator on a ebike build, however this is for a ev conversion, and I'm on a time crunch to find one asap.

Is there any wall wart or laptop power supplies that anyone can recommend? And I can order on Amazon prime for next day? I'd like 15-20amp output minimum

It seem out of maybe 10 types of adaptors which I have, about 20% works on dc voltage, the rest only work on ac, to bad they are not that powerful..
Thanks

 

[DogDipstick]

I have tiny mean wells that you put 120-240 AC 50-60hz ( label) to it and you get 24v DC.

.. They dont care if they are fed DC either.. they will take it and put out 24vDC .. Lol.. 2"x3"x1"... Rs-25-24


Then there are the Vicors with their circuitry.

 

[john61ct]

How can you test whether or not a given AC-to-DC SMPS is OK with DC input?

As in safely, say you have a device costs $500+ and do not want to risk burning it?

I assume fuses would help, but don't know what type nor where to place them.

I've read that with a full-bridge rectifier, even polarity doesn't matter, but I do not know why or how that works.

Apparently 120Vdc rectified emulates 85Vac input, but 385Vdc is better, is that to emulate 240Vac?