Re:For a car = bad idea! (Score 1)

I feel the impending crash of many computers as people try to plug these things into cars. The automotive electrical system is a nightmare of transients due to the very high current electromechanical components that are both consuming and producing energy, plus the fast transients induced by ignition and fuel injection devices. Look for positive and negative spikes of 60 volts, many lasting for dozens of milliseconds (an eternity if you're saving energy in little tiny capacitors, like this board seems to have).

The better way is to add a secondary storage battery, then charge the storage battery via a circuit with adequate protection and filtering (big RF chokes, forward biased diodes, RLC low pass, etc.)