I have recently redesigned our product to run from a 12VDC automobile type battery instead of 110 AC. I am using an off the shelf motor controller to drive a 1/3 HP dc motor. The controller works great but has no reverse current protection. Connect the battery backward and the drive will be fried.
I am considering a diode in the ground cable to the battery in order to stop reverse current. Since this type of battery can drive some pretty high currents, I am concerned about heat and damage to the diode. I will appreciate your thoughts about this approach, appropriate diode selection, and perhaps better ways to get this done.