Electric question

[closetop]

Im getting 0.46 ampere am i correct?

 

[closetop]

Amps = watts/volts

 

[Canuckbuds]

Well not exact model but its 12v dc 5.6 w can we determine amperage?

Your amperage is determined by your load(fans) not your supply. You have 2 fans at 5.6w a peice correct? So that's 5.6x2=11.2 watts. 11.2 w divided by your 12 volt supply = .93amps. This is higher then your 800ma power supply can provide. I'm surprised your controller didn't come with an appropriate power supply or link you to one. Again, I'm not an electronics specialist but I cannot imagine why this controller would supply a constant current of 3 amps when your load doesn't not require it. IMO it should read " Capable of supplying a constant current of 3 amps"

 

[closetop]

Ya wrong buy lol oops can you show me one that is appropriate possibly with a power supply this is for a veg box im using to give it intake outtake fans basicly

 

[Canuckbuds]

Im getting 0.46 ampere am i correct?

That is correct, however did you not say you had 2?

 

[closetop]

Yes i do my math was off thanks

 

[Canuckbuds]

Yes i do my math was off thanks

something like this regulated power supply would work,however it's out of stock, and I can't find it on amazon.com. I'm new to growing myself and haven't doing indoor at all. I'm sure your not the first person to use 12v fans on this website. Search around for other growers setups and you'll probably find something suitable.

 

[closetop]

Ok thanks

 

[growsomebud]

Is there a label on the fans that shows the amount of current they draw? If so, and lets say they each are 500mA, then you need a wall wart rated for >1 amp @12 volts. To supply each fan w/ 12 volts, you wire them in parallel to the power supply. Such as this:

TMEZON 12 Volt 2A Power Adapter Supply AC to DC 2.1mm X 5.5mm Plug 12v 2 Amp Power Supply Wall Plug Extra Long 8 Foot Cord

 

[growsomebud]

The 1203BB DC Motor Speed Regulator controls the speed of a DC motor by adjusting Pulse-Width-Modulated (PWM). It provides a continuous current of 3A to your DC motor or other DC load. Besides, the circuit also includes a 3A fuse, with reverse connection of power supply and control the forward or reverse direction and the stop of DC motor by switch.-

Features-

- Color: As the pictures shown.-
- Material: Metal.-
- Size: 5 * 3.2 * 1.5cm.-
- The input power range is DC6-28V.-
- Control the forward or reverse direction and the stop of DC motor by switch.-
- Potentiometer with switch function.-
- The switch cable length 15cm.-

Operating instruction-

Before you attempting to wire the controller, make sure that the power is off.-
1. Connect wires refer to the wiring diagram.-
2. Turn on the power, and adjust the potentiometer.-
3. The LED indicates the power up and the speed of motor.-

Warning: Do not reverse positive and negative power loads. This will damage the controller!-
Package Including-
1 * 1203BB 6V 12V 24V 3A 80W DC Motor Speed Controller (PWM) Adjustable Reversible Motor Driver Switch

Don't use this product! Your fans do NOT do reverse voltage.
PS I'm an Electrical Engineer

 

[growsomebud]

Your amperage is determined by your load(fans) not your supply. You have 2 fans at 5.6w a peice correct? So that's 5.6x2=11.2 watts. 11.2 w divided by your 12 volt supply = .93amps. This is higher then your 800ma power supply can provide. I'm surprised your controller didn't come with an appropriate power supply or link you to one. Again, I'm not an electronics specialist but I cannot imagine why this controller would supply a constant current of 3 amps when your load doesn't not require it. IMO it should read " Capable of supplying a constant current of 3 amps"

It could be worded better in that supply's description, but capable of supplying a max current of 3A is what is meant.

 

[growsomebud]

Ya wrong buy lol oops can you show me one that is appropriate possibly with a power supply this is for a veg box im using to give it intake outtake fans basicly

Just looking at the pic of that Ebay fan, it's clear it's like a 60mm fan. If your trying to bring in fresh air and exhaust warm air from a grow box, a fan this size is way too small. While I don't know the size of your grow box, I can tell you that most all mid and full tower desktop computer cases use 120mm or even 140mm case fans. You need larger fans capable of delivering a high number of air exchanges per hour to keep that box at room temperature. Here is a list that I have compiled from a website I love doing business with.
For fans these are top notch. They are used surplus. New, these would run $100+. I own one of these.
24VDC 235CFM COOLONG FAN | All Electronics Corp.

You would never want to run these at 24v. Way too loud; so you totally want to be able to adjust the voltage going to these. In fact, under 15v is more the norm. You'll still move plenty of air at this voltage or a little lower. And they would be "quiet". Therefore, you need a DC to DC converter, like this:
2A BUCK-BOOST CONVERTER W/ LED DISPLAY | All Electronics Corp.

You need to power that above converter. For that, a simple plug into the wall power supply would do the job, like this:

24VDC 5A POWER SUPPLY | All Electronics Corp.

With these fans, combined with the adjustable DC to DC converter and the power supply to power said converter, you'd have one hell of a setup. You don't want to give those fans the full 24v that they show they can take because you'd get uncomfortably close the max continuous current output on that converter. But, believe me, you would not want or need to run them that fast in order to get superior cooling for your grow box. There is, however, a different converter I could recommend that has a higher current output capability if your concerned about that. All of this is very easy to wire.