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  1. #1
    mtbr member
    Join Date
    Jun 2010

    tripple XPG's active cooling question

    hello to all u light people.
    I almost got all the parts for the bulid and only need a small advise about installing a fan.
    my build is:
    3 single XPG's will run in series in up to 1000mah each in.
    HIPFLEX driver
    battery is 4 cell 18650 14.8V , 2400mah

    I thinks I'll need a fan to keep it cool (here in israel we ride in high humidity and about 25-30 degree C at night..
    I need a small fan as possible, how much V / mah should it have and whats the best way to wire it?

    p.s - will a small fan from vga adapter card (like G-force) do the job?

  2. #2
    mtbr member
    Join Date
    Apr 2006
    Small fan will do wonders, use a 7812 or 7805 depending on fan's voltage. Put a thermostat in series with input pin of 78xx. Hook directly to battery input, fan will only run when light is hot. You can get a thermostat in a TO220 case. Look up Rubix cube light. It used a nice fan set up. James

  3. #3
    mtbr member
    Join Date
    Jan 2007
    Why not build a case with enough surface area instead of resorting to a fan? The amount of surface area needed to keep 3 XPGs cool isn't large enough to really present a significant design problems given that you get a fair amount of airflow at typical mountain bike speeds. Then you avoid all the drawbacks of including a fan in the design.

    - extra power consumption
    - noise
    - additional drive electronics
    - reliability (being a electro-mechanical device, the reliability of a fan is much less than other components like LEDs)
    - weather proofing - fans need to be protected from water

  4. #4
    mtbr member
    Join Date
    Jul 2005
    I tried this using a 25mm x 8mm 5v DC fan. It wasn't anywhere close to being enough air flow to make any sort of impact on a 20mm triple XP-E board.

    A 3x single XP-G setup wouldn't require a ton of surface area to stay within the rec'd operating temperatures.

    My "revised" double barrel design is proof of that:
    Second Double Barrel Regina...revised...

    The barrels barely get warm on some significantly warm nights.

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