Buck Converter DIY Battery Pack (EDITED)

atlas7

New member
Joined
Mar 9, 2021
Messages
16
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:


Kind regards,
 

Attachments

  • fan.png
    fan.png
    29.6 KB · Views: 32
Last edited:

OffGridInTheCity

Well-known member
Joined
Dec 15, 2018
Messages
1,462
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

Well-known member
Joined
Nov 16, 2018
Messages
574
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

New member
Joined
Mar 9, 2021
Messages
16
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

New member
Joined
Mar 9, 2021
Messages
16
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? :)
 
Top