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As stated by Eric earlier, cheap 12v inverters put out a horrible
square wave AC. This is not ideal for plugpack type step up or
step down converters. First sign you notice, they hum badly.
If the spike suppression/smoothing is not ideal, (read cheap or non
existent), then your $50 inverter could potentially kill your very
expensive laptop.
Having said that, Laptop supplies usually have good suppression of
nasties that emerge from badly inverted or dirty AC.
In the fine print of most cheapies there is sometimes the mention
'not suitable for notebooks/ laptops etc....
regards,
Steve B.
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