Yeah. 1 watt is 1 joule per second. 1 joule representing a coulomb of charge which has a mechanical equivalent in terms of kinetic energy and moving mass. Another way of thinking of it is 1 amp at 1 volt through 1 ohm of resistance. All that charge has to be put in the battery. 700 miles, figure thats at about 12 hours of driving at an average speed of 60mph. So how many amp-hours does that equate to? I don't know exactly, but I can say it is A LOT. That in turn is A LOT of current that has to be drawn from the electrical system. Yeah, problematic for sure.
It = a whole lot of potential energy from a battery if something shorts in a accident as well!
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