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    Best way to 12v fan on 24v system

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    • pabomanundefined
      paboman @Phaedrux
      last edited by

      @Phaedrux said in Best way to 12v fan on 24v system:

      https://duet3d.dozuki.com/Wiki/Connecting_and_configuring_fans#Section_Using_12V_fans_when_VIN_is_24V

      thx !

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      • mendenmhundefined
        mendenmh
        last edited by mendenmh

        If it's a fixed-speed fan (not PWM), you could probably just use a dropping resistor. Measure the fan current, and set the resistance for a 12V drop. R=12/I where I is the current in amps. A buck converter is nice, but for a low-power load, where you don't care about efficiency, it's a bit of overkill.

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        • zaptaundefined
          zapta @paboman
          last edited by zapta

          @paboman said in Best way to 12v fan on 24v system:

          Sunon and RS pro are available in 12 and 5 volts only.

          I had the same need (Sunon 12V) and a buck converter solved the problem. Sunon fans are much better than cheap Chinese fans and worth the trouble IMO.

          lord binkyundefined 1 Reply Last reply Reply Quote 0
          • Blacksheep99undefined
            Blacksheep99 @paboman
            last edited by

            @paboman said in Best way to 12v fan on 24v system:

            @Blacksheep99
            does Maestro have a voltage converter ? So can I drive the system with 24 v and cooling fan with 5 to 24v ?

            There is a jumper for fan 2 so you can run the others at VIN and that at 5v. I do this on my printer. I use a Noctua 5v and the part cooling fan is a 50mm blower.

            https://d17kynu4zpq5hy.cloudfront.net/igi/duet3d/x1wYdbGAsbWWvlqT.huge

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            • mrehorstdmdundefined
              mrehorstdmd
              last edited by

              I always keep some of these on hand for powering fans, LEDs, etc. https://www.amazon.com/EBL-MP1584EN-Converter-Adjustable-Supply/dp/B08GSJVPB2/ref=sr_1_6?dchild=1&keywords=buck+converter&qid=1615381025&sr=8-6

              They're dirt cheap, very small, very efficient, and seem to be reliable, but be very careful with the voltage adjustment pot. They're small and light enough that you don't have to mount them on anything- after you set the output voltage, just cover the whole thing with shrink tubing and treat it as part of the cable.

              https://drmrehorst.blogspot.com/

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              • lord binkyundefined
                lord binky @zapta
                last edited by lord binky

                @zapta I second the sunon fans. They last, and come in high CFM or low CFM for quieter.

                I personally think the best way is to put wire two 12V in series though 😄 more fans! ( Edit: 😇 OK ok, I was being facetious there and I'll clarify this is NOT the way to do it, but the responses did bring me a smile 👿 )

                zaptaundefined o_lampeundefined Phaedruxundefined 3 Replies Last reply Reply Quote 0
                • zaptaundefined
                  zapta @lord binky
                  last edited by

                  @lord-binky said in Best way to 12v fan on 24v system:

                  I personally think the best way is to put wire two 12V in series though more fans!

                  It may work, assuming the two fans identical (same current consumption) and if PWM controlled, are subject to the same control.

                  (I have no experience with multiple fans in serial so don't know for sure).

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                  • Vetiundefined
                    Veti
                    last edited by

                    its risky and could lead to problems if one fan is blocked

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                    • o_lampeundefined
                      o_lampe @lord binky
                      last edited by

                      @lord-binky
                      The FETs on the fans have to withstand 24V when switched, no matter if the fans are in series. Unfortunately it's not like series resistors...

                      1 Reply Last reply Reply Quote 1
                      • Phaedruxundefined
                        Phaedrux Moderator @lord binky
                        last edited by

                        @lord-binky said in Best way to 12v fan on 24v system:

                        more fans!

                        Do you mean buying more fans cause you blew them up with over voltage?

                        Z-Bot CoreXY Build | Thingiverse Profile

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                        • psyblueundefined
                          psyblue @paboman
                          last edited by

                          This post is deleted!
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