ljarrald 0 Posted October 11, 2011 hi, in my shed i have: 3 cameras, one PIR and 2 viper vibration sensors. they all connect to the same PSU via one wire. my neighbour has asked me to put another camera on the side of my shed facing into his garden. this camera will have a viper sensor inside the housing like the other two cameras (in case it gets hit with a brick again) so that will be more load on the psu. i have another psu identical to the one already in use (battery backed up and stuff) so i am thinking of wiring it in series with the other one. would this blow them? should i put a diode on the + of each PSU? should i not do it full stop? i really don't want to have to use a new PSU. Share this post Link to post Share on other sites
Soundy 1 Posted October 11, 2011 Kinda hard to answer without one very basic piece of information: what IS your current PSU? Make/model? Voltage? Current? Style? Share this post Link to post Share on other sites
ljarrald 0 Posted October 11, 2011 Kinda hard to answer without one very basic piece of information: what IS your current PSU? Make/model? Voltage? Current? Style? not sure of the model. its a 13.8V battery backed up 3AMP psu in a case that goes on the wall like an alarm base station. it has battery and output fuses that light up a 'fault' led when blown Share this post Link to post Share on other sites
Soundy 1 Posted October 11, 2011 Similar to this? If you look up the current ratings on each of your cameras and sensors, then add them up, that will tell you the maximum current requirement... I'd guess it comes in well under 3A, which means you should be fine running everything off the one power can. Just make sure each device has its own fused output. Share this post Link to post Share on other sites
ljarrald 0 Posted October 11, 2011 Similar to this? If you look up the current ratings on each of your cameras and sensors, then add them up, that will tell you the maximum current requirement... I'd guess it comes in well under 3A, which means you should be fine running everything off the one power can. Just make sure each device has its own fused output. a bit similar yes.baisically (sorry i forgot to mention) i am not sure if the output is 1A or 3A. it says one thing on the pcb and another on the sticker inside :/ the psu's are supposed to be for access control. how important is it for each device to be fused? Share this post Link to post Share on other sites
Soundy 1 Posted October 11, 2011 It's not CRITICAL for each device to have its own fuse... the fuses are mainly there to protect the wiring itself. From what I can find on those shock sensors (if they're the ones I think they are), they draw about 120mW, which would translate into 10mA at 12VDC... at that rate, you could (theoretically) run 100 of them off a single 1A fuse. Share this post Link to post Share on other sites
ljarrald 0 Posted October 11, 2011 It's not CRITICAL for each device to have its own fuse... the fuses are mainly there to protect the wiring itself. From what I can find on those shock sensors (if they're the ones I think they are), they draw about 120mW, which would translate into 10mA at 12VDC... at that rate, you could (theoretically) run 100 of them off a single 1A fuse. ahh right okay, in that case i'll just add the camera and if the PSU can't handle it, i'll add another one and see how it goes. thanks! Share this post Link to post Share on other sites
