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Old 02-11-2012
Shark0311 Shark0311 is offline
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FYI most devices that charge via USB cable charge at 5 watts (5V @ 1A). The exception is the Ipad that charges at 10 watts (5v @ 2A).

Converting DC to AC to DC is very inefficient and unnecessary in most cases. Just use a cigarette lighter adapter. There is no need to use an inverter for the devices that you have listed.
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