Per the Seeeduino specifications here, it says:
DC Jack & Vin Input Voltage
7V to 12V (lower is preferred). Maximum is 20V. If input lower than 7V and switch set to 5V, then VCC at AVR is about 2V below the input.
So two contradictory statements back to back. Input voltage is 7-12V, and maximum is 20V. What should I make of that? I have a 16 volt power source that I'd like to power it from. Will that work? Would a higher input voltage limit my current draw since the voltage regulator has to burn off the extra power? Any other limitations?