Power Requirements for MacBook Pro 13 inch

Are there lower power requirments for the 13 inch MBP from the 15 and 17 inch?
I understand that the 15 and 17 require 85 watts of power output, but when I was shopping for a power inverter, they mention a 60 watt would work for the 13 inch MBP.
Mostly curious. Most of the power inverters I am looking at offer more than enough output (100 watts+).
Thanks in advance.

Yes, the smaller models use smaller batteries that do not require as high a charging power or power to run with no battery present.
If you were to use an inverter to convert DC to AC then it's a good idea to get one with a power capability about twice what will be connected to it in order to allow for surges.

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