Is it safe to use a laptop charger to power two parallel 24v fans?

Submitted ⁨⁨1⁩ ⁨year⁩ ago⁩ by ⁨chrischryse@discuss.tchncs.de⁩ to ⁨askelectronics@discuss.tchncs.de⁩

I have a 3D printer and have a special filter that has two 24V blower fans that are connected in parallel. Unfortunately my printer doesn’t have the proper connectors for the fans. So if I purchase something like this power jack adapter I know the adapter is 12V not sure if that would make a difference. Anyway if I connect the female part of that adapter to the fan cables and plug in my laptop charger which is rated for 19v to 24V would that be ok?

If those adapters are fine, should I just purchase 12V blower fans instead?

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sj_zero ⁨1⁩ ⁨year⁩ ago
Parallel means that the voltage doesn't get divided. If you connect two 24v fans in parallel to a 19v charger, then both fans will get 19v. They might run a bit slow since the voltage will be lower than expected, but it'll be ok I think.
zurohki@aussie.zone ⁨1⁩ ⁨year⁩ ago

my laptop charger which is rated for 19v to 24V

Well, feeding voltage in that range to 24V fans would be fine, but “19 to 24V” makes it sound like a USB type-C charger or something which communicates with the device to set its output voltage. A power supply should have a single voltage.

Unless it’s one of those generic power supplies with a switch to set the voltage?

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- chrischryse@discuss.tchncs.de ⁨1⁩ ⁨year⁩ ago
  It’s just a universal laptop charger.
  
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  - zurohki@aussie.zone ⁨1⁩ ⁨year⁩ ago
    If it just puts out normal voltage it’ll be fine.
    
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sin_free_for_00_days@sopuli.xyz ⁨1⁩ ⁨year⁩ ago
Just get a boost converter. Cheap, like < $20.

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- chrischryse@discuss.tchncs.de ⁨1⁩ ⁨year⁩ ago
  what would I connect it to for the power source?
  
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  - sin_free_for_00_days@sopuli.xyz ⁨1⁩ ⁨year⁩ ago
    I figured you already had some type of adapter already. Either the one you linked, or the DC connection from the printer. If that’s the case, then it’s ridiculously easy to do a DC to DC adapter. If you do not have a DC supply and just need a 24v power supply, splurge on something like this.
    
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Rolive@discuss.tchncs.de ⁨1⁩ ⁨year⁩ ago
Yeah don’t worry about it. Running a fan at a lower voltage than it’s meant for will result in slower fan speeds and a longer lifetime. Compared to the wattage an actual laptop will draw this is absolutely nothing. I power my soldering iron with an old laptop charger without issues.

Those plugs are generally used in 12V systems but they can handle higher voltages too. It’s the current you need to be mindful of for the most part, they can overheat if you try to power a space heater or something from that but a few fans won’t cause any issues.

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elDalvini@discuss.tchncs.de ⁨1⁩ ⁨year⁩ ago
Those adapters should definitely be fine for 24 V. Running the fans off 19 V will probably work, but they will run at slightly slower RPM (probably not a big problem for a filter).

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