OK to use diode to drop 39v to 35v?

Thread Starter


Joined Feb 1, 2019
I have some schokey diodes rated at 15 amps. I have a bunch of 3000mah 39 volt fully charged battery packs. I need to get to voltage down to 12 volts. Most of the cheap Buck Converters on Amazon have a voltage limit of 35v. And my project Will pull about 10a.

Can I use a couple of these dioses to drop the 5v or so?


Joined Aug 21, 2017
4V/0,7V=6 pieces?? Better to use any voltage stabilizer circuit, as an example 7805 with current booster for example 2N3055


Joined Oct 29, 2013
Can you use diodes? Yes. Should you use diodes? You have to do some math. They will dissipate the energy just like a resistor, so dropping 4v @ 10A is going to be 40W, that's a lot of heat to get rid of. And a lot of wasted energy (kills your batteries faster). A buck circuit will be a ton more efficient if you can find one that will work, or if you want to build your own.