MacBook Pro: Continuing issues using airline, auto power sources

We continue to report an issue where the MacBook Pro does not work with power sources offered on some airplanes and in automobiles. As originally stated, the issue appears to be excessive power draw, as units can be charged from the inverters while powered off, but exhibit issues when turned on (while charging).

The MacBook Pro draws 85W of power, while most airline power inverters supply 75W or less.

A MacFixIt reader writes:

'I had a similar issue when trying to use a MacBook Pro with a power inverter. My experience was similar to Jim's, however, my inverter is rated at 750 watts. It charges the computer just fine, but when I try to use the machine, the inverter will randomly beep and complain. The funny thing, is it happened more often with Rosetta apps running in the foreground, even if processor load in activity monitor was low."

One solution we noted previously is to remove the battery from the MacBook Pro while it is connected to a low-power (airplane, auto) source. This will reduce overall power consumption, and may allow the unit to function properly.

Another solution suggested by some users is use of the MacBook (13") power adapter which draws only 65W of power. This adapter is compatible with the MacBook Pro but will not allow simultaneous charging of the battery and operation of the system -- only one or the other.

Finally, Mikeguyver offers Magsafe car adapter conversion kit that provides direct DC to DC power, providing better operation (in some cases) for MacBook's plugged into automobiles.

Feedback? Late-breakers@macfixit.com.

For further coverage, see our MacBook Pro special report.

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