Osgeld:
otherwise your arduino's voltage regulator might run a little warm, but it should be fine as it has protection in the IC
I have also purchased one of these:
LM2596 DC-DC Step Down CC-CV Adjustable Power Supply Module Output DC 1.5V-35V
Not sure if I need it since I am unsure if this is better than the simple Voltage Regulator on the arduino?
Would it be worth putting this inline?
Chris