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> >The one I bought is rated at 100 watts steady, 140 peak, which should be >more than >enough for my TP's supply (I forget whether that is 25 or 40 watts). It >cost under >50 dollars US which is less than the prices I have seen for the IBM car adapter. > You may be right and lucky. 100 Watts om mains current is less than 1 Ampere. In 12 Volt 100-140 watts is 8-12 Ampere which is what the thing must be able to draw out of the car battery and handle before conversion. The units I looked at to a reasonable price did not have enough handling capacity and the price got very high when the rating reached 10A. > >