Going on a road trip, need a power inverter...

i've got mbp , charging 2 iphones off of of trip. how big of power inverter need?

http://www.walmart.com/ip/xovision-220w-cont.-power-inverter-xo220/9224432

provide enough juice?

thanks!

 

are sure mbp charger isn't 100-240v (because mine - wouldn't need inverter then)?. , charge iphones mbp... don't want reason?

 

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