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1.5W unloaded? From what I recall from an ancient Chris Juden CTC article, I thought the penalty of an unloaded hub over a decent non-dyno hub was <<<1W, so that sounds awfully high.
Thrustvector-
So reading off the data provided for the dynamo without an electrical load, the SON28 uses ~1.5 W at 30 kph and the 3N80 uses just under 3 W at 30 kph. Likewise, it's ~6.5 and ~7.5 W under their test load at 30 kph. That's where I got my 1.5 W difference.
Schmidt's own testing has a non-dynohub as a control and they reckon 0.5 W at 30kph (with the SON28 at 1.5 W and the 3N80 at 2 W).Either way, my point was that the SON is glorious but you don't save that much in power terms (although you gain in reliability as the Shimano isn't really designed to be serviced).
hamrack
Makes you want a SON and then you remember that it's only saving you 1.5W (unloaded) for your £150 over the 3N80!
Nice that he's put the results into context with respect to other added drag (from panniers/tyres/load etc).