I am trying to activate 2 12 VDC motors that each draw currents of 12 A when at full load. I also have a 25 A external power supply that's used for both motors since the arduino can't handle output currents like that.I realized that I will have to use two relays. I know there are 5V to 12V relays but are there relays that can handle 25A of current like that and are also compatible with the arduino?If so, can someone link me to the product?
@RetroleftyHow will I know the specs of the transistor that I need? I assume the base current is the current of the arduino which is 200 mA. If the power supply is 25 A, does that mean the transistor needs to amplify the current from 200 mA to 25 A? I feel like that is a bit large but I am sure I am wrong
@ dc42 what would the coil resistance be? is there a way to determine the minimum current resistance using the specifications i have? Do I just use V=IR? in that case would my V be the 12V and the current would be the 40A?