I have a 2011 Nissan Frontier Pro-4x. I want to get a general idea how much power I could draw from my alternator while driving. For that, I want to find out how much power my truck uses in the first place.
My alternator produces up to 130 amps, assuming a voltage of 14 volts while driving, around 1820 watts
How can I find out how much energy my truck consuming and how much do I have left over, with truck driving on a highway, lights off, stereo on, etc.? Is it possible to measure power consumption of the whole system using some kind of tool?