I am an artist, building a functional miniature which contains multiple devices (3 12 V computer fans, 1 cooling pump, two LED strips totauling 14 segments of three or 42 individual lights, and 1 Peltier tile). They are currently wired in parallel. I have been using an adjustable power supply, and it works however it only works when I turn the supply up to 19 V, which I know is bad for all of the devices. This supply claims a max of 3.4 A output. I also have a power supply which provides 12 V and 6 A, which when plugged in is insufficient to power the device. I have tried calculating what the current draw of the device should be, however I am not sure what the current draw of the Peltier tile is or how to determine it, and my best estimate is the the device should use possibly 4-7 Aat 12 V. Why does it work when I give it additional voltage, and yet when using a higher amperage power supply (possibly sufficient) it doesn’t work? What would be a better hypothetical way to supply power to this device? How can I calculate the current the Peltier tile is drawing?
I am learning as much as I can about electrical engineering to safely build this object, and I know enough to hack together art objects, however I am not a professional, and I feel like I have come up against the limits of my ability to figure this out!
I do have a multimeter, which I’ve used to test the claimed voltage of my adjustable PSU, and it is accurate to what it is putting out.