Buck Converter DIY Battery Pack (EDITED)

[atlas7]

Hello all

I would like to use a buck converter to step down the voltage from my 13S pack to run smaller things such as 2 cooling fans. I have decided to use a fan controller as I do not want both fans running 24/7. I have produced a wiring diagram of the process but I need a second perspective. Can someone verify the schematic please (please see attached image)? Thank you

I have attached links to the fan controller, 2 fans and the buck converter:

Fan Controller: https://www.amazon.com/HiLetgo-Temp...QS5SWFDW8SEW&refRID=ZYK8WSYRQS5SWFDW8SEW&th=1

Buck Converter:

14.0US $ |RCNUN High Quality 36V 48V to 12V 25A 30A DC DC Step Down Converter 48 Volt to 12 Volt Golf Cart Voltage Reducer CE RoHS|48v to 12v|down converter12v 48v - AliExpress

Smarter Shopping, Better Living! Aliexpress.com

www.aliexpress.com

Kind regards,

 

[OffGridInTheCity]

Wiring looks ok and I have used a few of these 'simple' bucks and they work just fine. What's cool is they maintain a steady 12v output regardless of the battery voltage going up/down a bit.

 

[ajw22]

Small oversight: Fan1(+) side is not connected
And you'll probably want to put a fuse or breaker between the battery(or BMS) and buck converter. In case of a fault in any component, you'll want the fuse to blow before any of the wires can overheat and start a fire.

 

[atlas7]

Wiring looks ok and I have used a few of these 'simple' bucks and they work just fine. What's cool is they maintain a steady 12v output regardless of the battery voltage going up/down a bit.

Perfect! That way the fans are not over or underworked

 

[atlas7]

Small oversight: Fan1(+) side is not connected
And you'll probably want to put a fuse or breaker between the battery(or BMS) and buck converter. In case of a fault in any component, you'll want the fuse to blow before any of the wires can overheat and start a fire.

Good spot! Fan 1 (+) is meant to be connected to the same wire as Fan 2 (+), thanks for that, will update the image once I get home

I'll probably have the breaker/fuse in between the wire that connects the Buck Converter's input (+) to the main battery (+). Do you know any good breakers that I can use for this case?