Originally Posted by Momobile

I wanted a better answer than the garb. posted above thus I studied up a bit.

Amps X Volts = Watts

The Civic's alternator is rated at 70 amps.

70 X 12 = 840

840 X .5 = 420

So, the educated answer to the original question is that the Civic could handle up to a 400 watt inverter. Thank you.