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Review title: Too loud for car laptop use
Product review: We tried to use this Wagan Tech Smart AC 120 USB unit to power an IBM Thinkpad T41 laptop in the car. The T41 AC adapter says it has an input rating of 100-240V 1.5-0.9A and an output rating of 16V 4.5A, so about 72 watts of output to the laptop. Of course, I don't know how efficient it is, so I tried plugging the adapter into a Kill-A-Watt power meter. The laptop (with a partially charged battery) uses about 21-25 watts of power while watching a disk-based video file (not a DVD). Our experience in the car with the T41 AC adapter plugged in to the Smart AC 120: the unit gets very warm while in use AND after about 10 minutes of use, the fan kicked in with an unbearably loud buzzing sound. Even freeway road noise at 60-70 MPH could not drown it out. So Mr. Dave's review from 3/12/2008 is right on the money. The unit might be overrated for extended laptop usage, especially older power-hungry laptops. But for a portable DVD player, it might be fine.
