Originally Posted by polarlyse
I just looked at the charger for my Mac-book. It says 15 amp. but that's through a
130-240 v outlet. If you have a 12v
charger check what the draw is. It might work.
Magsafe output should be 85 watts... which comes in just under the 8A at 12V
listed on that outlet. Since you're really generally dealing with 12.7 volts or more, it should be a little under 7A assuming 100% efficiency, so there's a little wiggle room.
Even 1.5A at 120v is 180W... more than double what they list as the nominal rating of the Magsafe 2 adapter.