input current to buck/boost regulator?


Joined Feb 24, 2006
have 360w 30A out 24vdc - 12vdc regulator, what input current should i expect at full load, pls?
As a matter of practice, when actual information is lacking, my default efficiency for all DC-DC conversion processes is 80%. So if the output power is 360 Watts, then I would proceed as follows:

\( \cfrac{360 \text{ Watts}}{0.80}\;=\;450 \text{ Watts - Input Power} \)

\( \text{Then,} \)

\( \cfrac{450 \text{ Watts}}{24 \text{ Volts}}\;=\;18.75\text{ Amperes} \)

Was that the calculation you were looking for? You can of course use a different efficiency if you have the data to support such an assumption, so your mileage may vary.

Thread Starter

Poor old sod

Joined Jul 25, 2017
afair auto fuses will pass rated current, but blow instantly on 2x rated current.
thats all i remember. my cct is battery to load hard wired, nothin delicate, it has 15A fuse, i could make it 20A, BUT....


Joined Nov 6, 2012
It's hard to find an Automotive-Fuse-Holder ( ATO/ATC ) that is
completely reliable at a continuous ~20-Amps,
this depends heavily on the environment it is being used in.
If You need dependability,
go with a "Maxi-Fuse" style Fuse-Holder, and keep it totally dry and cool.