The question is how much power really is needed. It's one thing to get into your car that's been baking in the sun, and another 10, 15, 20, 30 minutes and beyond after you've started to cool the car. Is the 3kW average over the entire period? Wouldn't you need less once the car had cooled a while? Is 3kW what a Civic needs or average between a Civic and a Suburban?
Somewhere on this forum there was a guy who made his own cooling seat and just filled a chest with ice water before heading out. It's much more efficient to just cool your body instead of the entire cabin.
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