Is this re-Arm controller actually 24 V capable?
Given that the capacitor near the input is quite clearly marked 35&nbsp;V, a 36&nbsp;V rating seems questionable.

The (buck) regulator used on the (genuine version of the) board is the AOZ1282CI which supports up to 36&nbsp;V input. This is probably where they got the 36&nbsp;V rating from, but obviously the 35&nbsp;V-rated capacitors drop the input voltage down below this.

Schematics for the board are available on the RepRap wiki and show that the input voltage only feeds into the regulator. I see no reason why this board couldn't handle 24&nbsp;V input, as this is well within the rating of both the regulator and the capacitors.