The E-werk is basically a very flexible power converter for any 6V dynamo (hub or bottle). I'll have to experiment to see if it can produce enough wattage to charge a powered-off netbook while riding. My hope is that an unregulated "6V 3W" dynamo will actually produce enough wattage above 3W (which is really the lamp system rating, which is why the good lamps include internal regulation) at reasonable speeds that it'll start pushing significant enough current into the netbook via a DC up-voltage adapter to trigger the charging circuit. The netbook's power adapter is rated a lot higher, of course, but it's rated to deliver both a high-speed charge current and power the netbook operation at the same time. So, it may depend quite a bit on the charging circuit of the netbook itself at lower amperage.