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Voltage output of cheap invertors is a modified square wave. Multimeter cannot display accurate voltage when reading modified square wave as it is calibrated for sine wave. I have been using infrequently small invertor to run Toshiba and IBM notebooks without problems. I know nothing about MACs but if it can accept DC input you are better off by using DC/DC converter. It got more stable output, less noise and uses less power from your battery.
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