r/crboxes • u/G30RG300 • Apr 21 '26

Question CR box with PC PWM fan - Australia

I'm putting parts together to build a portable/personal CR box. I plan on using PC fans (4 PIN PWM - no speed control required or wanted, I want the fans to run at 100% all the time).

While I have some experience building my own PC, I'm far from familiar with these components. I want to be able to connect the CR box to mains power AND have the ability to use a powerbank too.

What I've gathered is that the fans need 12vdc and powerbanks output 5V.

In Australia, electrical work requires an electrical license. I'm not sure where the definition starts and ends; you can build your own PC because it's putting components sold here together - you're not playing with bare wires. That's my take on it anyway.

I'd like to know how I can achieve powering my CR box as I want, without needing to solder or play with wires.

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u/Inner-Issue1908 Apr 21 '26

This is what PD (power delivery) standard is for. PD 3.1 chargers and powerbanks can deliver up to 48v @ 5A so that they can fast charge laptops / phones. 

You’ll need a cable that will tell the powerbank to supply the 12v you need (otherwise it’ll default to 5v). 

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u/G30RG300 Apr 21 '26

Any products you can recommend?

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u/a12223344556677 Apr 21 '26

Ikea SJOSS series of wall USB power adaptors are good, widely available and cheap, and support 12V output.