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Old 06-30-2012, 08:16 AM   #1
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Laptop cooler voltage question


Hey, so i am making a cooler for my laptop, and i have 3 12V fans that i am going to run to a single phone charger and plug into the wall. i was just wondering if the charger can handle that many volts, it says 5V on it. Thanks

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Old 06-30-2012, 08:24 AM   #2
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Laptop cooler voltage question


If you wire them in parallel you need a charger that provides 12V. If you wire them in series you need a charger that provides 36V. I'd suggest swinging by your local thrift stores. You can probably find a used 12V wall wart for a couple of bucks.

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Old 06-30-2012, 08:46 AM   #3
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Laptop cooler voltage question


The charger need two thing to be correct. The voltage and the watts. The charge will need to be 12 volts. It also needs to be enough watts or current for the fans. Look on the fans for a current or watts rating and add them up. The charger will need to be the same watts or greater watts to run the fans.
The fans are also likely DC so make sure the charger is DC and not AC.
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Old 06-30-2012, 09:30 AM   #4
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The charger need two thing to be correct. The voltage and the watts. The charge will need to be 12 volts. It also needs to be enough watts or current for the fans. Look on the fans for a current or watts rating and add them up. The charger will need to be the same watts or greater watts to run the fans.
The fans are also likely DC so make sure the charger is DC and not AC.
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If you wire them in parallel you need a charger that provides 12V. If you wire them in series you need a charger that provides 36V. I'd suggest swinging by your local thrift stores. You can probably find a used 12V wall wart for a couple of bucks.
i miss read it, it says

input 100-240V
50/60hz 0.3A

output 5V 700mA

the fans are 36V and .63A

i dont know what that means. is that too many volts or watts?
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Old 06-30-2012, 09:38 AM   #5
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Laptop cooler voltage question


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Originally Posted by DIY er View Post
i miss read it, it says

input 100-240V
50/60hz 0.3A

output 5V 700mA

the fans are 36V and .63A

i dont know what that means. is that too many volts or watts?
5V x .7A = 3.5 watts
36V x .63A = 22.68 watts

Ain't going to work.

You need 6 times more power for those fans to work.
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Old 06-30-2012, 09:51 AM   #6
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5V x .7A = 3.5 watts
36V x .63A = 22.68 watts

Ain't going to work.

You need 6 times more power for those fans to work.
thanks! so what are the stats i need on the charger, and could i power 1 or mabye 2?
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Old 06-30-2012, 11:56 AM   #7
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thanks! so what are the stats i need on the charger, and could i power 1 or mabye 2?
You can't power any. Here's the deal: The power supply voltage must be THE SAME as the fan voltage. The power supply current must be AT LEAST the combined fan current.
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Old 06-30-2012, 12:22 PM   #8
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Laptop cooler voltage question


Just pop over to either Radio Shack, Best Buy, local mom & pop store, and get a couple of cpu cooler fans. or computer case cooler fans. Most coolers will use the USB port, not a separate power source, so that they are portable.
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Old 06-30-2012, 02:32 PM   #9
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Just pop over to either Radio Shack, Best Buy, local mom & pop store, and get a couple of cpu cooler fans. or computer case cooler fans. Most coolers will use the USB port, not a separate power source, so that they are portable.
MOST will in fact be 12vdc since thats what rail a molex connector in a pc case will be connected to.

There are some pre assembled laptop coolers that do run off of USB but a selection of 5 v fans is not going to move a lot of air and will kill your battery.

Most laptops simply don't need it these days. If yours is especially hot underneath, I'd suggest that either you are not placing it on an appropriate surface, or the ventilation channels inside are clogged. Or both.
Do you have pets? Long hair on you or S O? Odd but true that laps are not a great place to use laptops. Either clothing or exposed flesh tends to get in the way of proper airflow.
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Old 06-30-2012, 02:39 PM   #10
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Laptop cooler voltage question


Evstar, actually Radioshhack sells the 3.5 & 5 volt fans, so does BB.
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Old 06-30-2012, 03:13 PM   #11
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Odd but true that laps are not a great place to use laptops. Either clothing or exposed flesh tends to get in the way of proper airflow.
Quite true. The best thing to use is a lap "pillow" that is basically a cloth beanbag with a masonite top that is hard and flat to keep the fan's airflow going.

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Old 07-07-2012, 06:20 PM   #12
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Originally Posted by gregzoll
Evstar, actually Radioshhack sells the 3.5 & 5 volt fans, so does BB.
I'd did say most ... Not all... Lol
Still it's a great way to cut your runtime in half.

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