stevechewbacca[501st] Posted October 2, 2011 Report Share Posted October 2, 2011 Hi guys !! Here's my problem : I just connected a çv battery (without any encloser but just the connector) to an fan. It worked well but in less than 2 minutes, the battery went to high temperature... Do you have any solution for this problem ? may I use an encloser ? Thanks ! Quote Link to comment Share on other sites More sharing options...
TD-3425 Posted October 2, 2011 Report Share Posted October 2, 2011 If the battery is getting hot really fast, it means you have a short somewhere. (IE, there is a connection happening between the negative and positive terminals before it runs it's (circuit) path through the fan wires. You don't need an enclosure unless you want one, or suspect metal would get into the battery (again causing a short) in which case, you can do it. But first, lets find the short circuit. How are you connecting the fans to the battery? Quote Link to comment Share on other sites More sharing options...
gazmosis[501st] Posted October 2, 2011 Report Share Posted October 2, 2011 Can you draw up a rough schematic? Quote Link to comment Share on other sites More sharing options...
stevechewbacca[501st] Posted October 2, 2011 Author Report Share Posted October 2, 2011 Thanks guys ! Well I tryed to repair the short cut but the battery came too hot again. Here's the pic of what I have : Thanks for your help ! Quote Link to comment Share on other sites More sharing options...
stevechewbacca[501st] Posted October 2, 2011 Author Report Share Posted October 2, 2011 (edited) I found that on the web and it seems to be more logical than what've done : ---------- Edited March 28, 2022 by gmrhodes13 link removed no longer working Quote Link to comment Share on other sites More sharing options...
Darth Aloha[Admin] Posted October 2, 2011 Report Share Posted October 2, 2011 (edited) Edited October 2, 2011 by Darth Aloha Quote Link to comment Share on other sites More sharing options...
kevster[TK] Posted October 2, 2011 Report Share Posted October 2, 2011 (edited) Something in the switch might of broken, or some wires might be touching where you have the wires taped up at the molex connector.... and come to think of it, I think I know what the problem is, I believe the switch should be connected to one side of the wire. You have the switch connected to the positive and negative. It should be on either the positive OR negative ( like how you have it on just the positive in the diagram). Also the color you did the diagram, make sure you used the red and black wires on the fan, the yellow isn't power. Edit: Now that I think of it even more, it is the way you have your switch set up. A switch carries the current through to allow electrons to pass. You have a current going through the switch AND the fan, which as trooper234 said is a short. Edited October 2, 2011 by kevster Quote Link to comment Share on other sites More sharing options...
Darth Aloha[Admin] Posted October 2, 2011 Report Share Posted October 2, 2011 Ahhhh indeed.... good catch. I stared at that image for some time and didn't catch that.... I am embarrassed for anyone to know just how much of my job involves working with electronics Aloha, -Eric Something in the switch might of broken, or some wires might be touching where you have the wires taped up at the molex connector.... and come to think of it, I think I know what the problem is, I believe the switch should be connected to one side of the wire. You have the switch connected to the positive and negative. It should be on either the positive OR negative ( like how you have it on just the positive in the diagram). Also the color you did the diagram, make sure you used the red and black wires on the fan, the yellow isn't power. Edit: Now that I think of it even more, it is the way you have your switch set up. A switch carries the current through to allow electrons to pass. You have a current going through the switch AND the fan, which as trooper234 said is a short. Quote Link to comment Share on other sites More sharing options...
gh05ty Posted October 2, 2011 Report Share Posted October 2, 2011 join both live wires (red) directly to each other and run only the earth wires(black) through the switch - never run a current through a metal switch, this should solve the problem. The yellow wire on the fan is for a thermal cut out if used on a cpu so if you dont plan to use it in a pc again cut it off Quote Link to comment Share on other sites More sharing options...
stevechewbacca[501st] Posted October 2, 2011 Author Report Share Posted October 2, 2011 Thanks Guys ! I have to re-build the system now and it'll work well Quote Link to comment Share on other sites More sharing options...
stevechewbacca[501st] Posted October 3, 2011 Author Report Share Posted October 3, 2011 Fixed ! All is fine, just need to put it inside the helmet Quote Link to comment Share on other sites More sharing options...
TK bondservnt[501st] Posted October 3, 2011 Report Share Posted October 3, 2011 I used velcro to attach the parts to my helmet, this way one fan system for all my 5 helmets. Quote Link to comment Share on other sites More sharing options...
stevechewbacca[501st] Posted October 3, 2011 Author Report Share Posted October 3, 2011 I'm doing the same ^^ Quote Link to comment Share on other sites More sharing options...
G Demler Posted December 12, 2011 Report Share Posted December 12, 2011 The answer is RC Car batteries 9.6v (2) from Radio Shack. Wire them to give you around 20v when they are fully charged. The 12v fans can handle the additional voltage. Gives you 6-8 hours of run time and the best part they can be recharged hundreds of times. I always hated feeding the 9v monster Quote Link to comment Share on other sites More sharing options...
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