CommentStreams:F575130f5bf58151b807969776565eaf

To give more information on this: I used two UPS boards stacked together/ I have supplied 12v to power input port of both boards at the same time, and everything works.

But once I do the same thing, but with 20v, once I supply 20v to power input port of both UPS board at the same time, it smokes near the power input end, a small black square component near the power input port, on both boards is burning red.