I am trying to build my own power box, So I plan to power lights, a glow hole, and my livescope, with the ability to charge my phone and other 12 volt accessories. But from what I have been finding, most of the my power connections work with 12 or 24 volt, so I wont need a transformer.

Ok thanks

Jamin, Wont that make my output voltage around 10 volts? Then as my source voltage drops wont my output continue to drop?

@Jamin Wont that make my output voltage aroung 10 volts? And continue to drop as my 20 volts drops.