Powering some 12v fans
- Thread starter Inwardjim
- Start date
svchop889
Well-Known Member
well get a 12v charger that has enough amps to power multiple fans the 12v pc fan I have is .30A so if I wanted to power 2 i would need to wire the fans in a parallel circuit connected to a charger with an output of 12v and .30A that would be the easiest way. you could wire them in series but you would need a 24v power source with .6A good luck finding that...
dingbang
Active Member
svchop889 absolutely correct, make sure you wire them parallel.
there are a few DIY threads about this if you need a visual also...try the search function.
also, your power supply output can be more amps than your fan is rated for but no less. the less amps that are drawn off of the power supply, the cooler it runs, which is key to my small closet grow. so for example one of my fans is a 12V 800mA axial fan powered by a 12V 1250mA power supply that contributes almost no heat to cramped area where it's stored.
there are a few DIY threads about this if you need a visual also...try the search function.
also, your power supply output can be more amps than your fan is rated for but no less. the less amps that are drawn off of the power supply, the cooler it runs, which is key to my small closet grow. so for example one of my fans is a 12V 800mA axial fan powered by a 12V 1250mA power supply that contributes almost no heat to cramped area where it's stored.
svchop889
Well-Known Member
yes basically the amps on the power supply is the maximum the unit wil be able to supply I am glad you added this i forgot to mention it. parallel is basically this with the multiple fans you want all of the + wires from the fans connected and all of the - wires connected.then the + wires from all the fans connected to the positive of the supply and the negative to the negative.
You are aware that the 12 volt wire on a computer psu is the yellow one, not the red one, right? I remember being confused by this myself when I encountered the same issue with fans being slower on a PSU.
Many of my fans themselves only have a red and black wire. When connected to a 12 volt DC adapter (charger etc.) they will spin fast.
However, when connected to the red/black side of a computer PSU, they will only spin at half speed, since the red wire on the PSU connector is +5 volts. But, if you connect them to the yellow/black side of the PSU, you will get your full 12 volts.
This is only an issue if you are using a computer PSU.
EDIT: Like this:-
However, when connected to the red/black side of a computer PSU, they will only spin at half speed, since the red wire on the PSU connector is +5 volts. But, if you connect them to the yellow/black side of the PSU, you will get your full 12 volts.
This is only an issue if you are using a computer PSU.
EDIT: Like this:-
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CLOSETGROWTH
Well-Known Member
Many of my fans themselves only have a red and black wire. When connected to a 12 volt DC adapter (charger etc.) they will spin fast.
However, when connected to the red/black side of a computer PSU, they will only spin at half speed, since the red wire on the PSU connector is +5 volts. But, if you connect them to the yellow/black side of the PSU, you will get your full 12 volts.
This is only an issue if you are using a computer PSU.
EDIT: Like this:-
Great post Brother..very detailed kudos!
