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I have used one of those AC converters (They plug into the cig lighter / ac adapter and convert the power for regular use)
400w: now that's a bright car interior! You use a joker 400 for that?
Use nd or limo window tint to the back and side windows that are in the shot.
This will help lower the difference in exposure from outside the car to the interior.
John Hudson's suggestion is a sound one for powering lights. You can also use a battery operated 200 watt Joker, or even use the 400 watt if you use a 1000 watt inverter. I wouldn't count on a 750 watt inverter for a Joker over 200 watts. I know the numbers work, but not my choice for shooting over a long period of time. I have mounted 200 and 400 watt jokers to the hood of the car before... Specialized rigging , but works great..