how much do u know about electricity? +reps given

hey guys, I've had to re-do my grow area and add some more pc fans. i had 2 now ive got 5, but anyway, when i first started I just rigged the 2 up and didnt really pay any attention to any of the numbers on the charger and fans and just assumed(correctly) that 2 wouldnt short (or something bad like that) my cell phone charger or anything. what numbers on the charger and fans do i compare to find out how many fans each charger can run?

anyone?????

It is possible that all the information you need is not going to be on the fans, or the chargers. Do you know how many watts the fans use under normal use? The voltages they are rated to run at? Or the resistance of the chargers (in Ohms, or the Omega symbol) If so, you can get a concrete answer.

It would be better to say that you should be safe to run 2 PC fans up to 120mm fans off of one 12V adapter. The lower the voltage of the adapter or the more fans you put on (which will increase resistance), the slower the fans will run. So you should probably only need two more adapters to power all of your 3 new fans at half speed, or you can put a 12V adapter on each one to for top speed, or mix it up to fit your needs.

Hope this helps a little.

thers at least two guys come on the site that are experienced/qualified electricians they always ask if ne1 needs questions like this answered.

Well, I can answer you with a simple bit of formula.

Watts divided by Volts = amps (load)

In ur case 12 watts divided by 12Volts (ur charger) would equal 1 amp.

So with a 12 volt charger, every 12 watts used is 1 amp of load.

Allright bro. imma help ya out first ya got to find out hom many amps that room can handle. Meaning most "HOME" rooms, assuming you are STATES side meaning U.S., can hold up tp 15 amps w/o overloading your circuit or tripping your breaker. Go outside check your breaker for that room see how many amps that breaker carries. Now look at your amp rating on your fan located on the silver tag or tag on the motor area of the fan, it should tell you how many amps that fan pulls when in use. If your fans and anything else thats using the same outlets cannot go over the alloted amps for that room. If this turns out to be the case you will need to up that breaker or do some re-routing....Hope I helped in anyway I could.

Don't use more than 80% of what the breaker says.... so on a 20 amps, don't pull more than 16 amps... motors always draw more power to start up and then drop back down to their rating. u need to leave a little wiggle room.

If you are talking about just powering the fans then don't worry about breaker load. You could run dozens and dozens of pc fans with no problem.

You can pick up an 250 watt AT-Style power supply at most computer shops for around $20.00. That will run a large number of fans. And that is one of the "smallest" pc power supplies you can buy.

On ur PC fan it may say something like 5 mA, or milliamp. This means .5 watts, meaning at 12 volts, ur load is 5/12ths of an amp, and as SR posted, you could run many of them on a 15 or 20 amp breaker.