What step-down convertor to use Australian MacAir in US

I want to use my 240 V MacAir (Australian) in US when I travel there. What size step-down convertor to I need? Will 300W be enough or safer to get a 500W?

If you are using the Apple supplied charger, there is no need for a step-down convertor. Apple charger units are capable of using voltages from 100-240 Volts AC. You will simply need a plug adapter for the US power system.

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