Does the 2007 Nissan Wingroad comes with a built inpower inverter/converter for plugging in small appliances ?

You were right the first time, it's called an inverter. No place shows that the Wingroad has one built in from the factory, but they can be had aftermarket in a couple ways: Plugs in the cigarette lighter, or nowadays I guess its 'power outlet' and will invert 12VDC to 100V AC (are you in Japan? 100Volts is standard voltage in Japan where the Wingroad is sold), or 120V AC but will only hold up to very small 100V amperage draws, the fuse will blow. There are kits that you can hook up directly to your battery, the regulator will 'pick up' on the draw and and you will get far more juice, but for one thing it must be run at a very high idle, at least 1500rpm to get the maximum power out of your alternator and it will provide you with about 8 to10amps @ 100VC, 60hz depending on the output rating of your alternator. These things do work, but are a strain on your car. From what you describe...guessing..a mobile pet grooming business? A shear, blow dryer Oh BTY, forget the blow dryer unless you have a very small low draw one. Those things blow circuit breakers in houses they draw so much. And a blender to mix a few cocktails while cutting the dog's ear off with the electric shears