So, this is in general terms... But say you have a flat battery and you wanted to start a car without another card battery?
Car batteries are 12V but I'm not sure how much current they are.
Do they need about 3000W for starting? (About 250 amps?)
Does the amperage drop when running?
Does the amperage change (when running) depending on lights/wipers/sound system usage?
If I wanted to jump start a car, I'd need at least a source of 3000W, correct?
If I wanted to charge a car with a source less than 3000W (Say, 300W [12V, 25A] supply) it would need to charge for a few hours, correct?