Originally Posted by
noglider
Many of us think this ought to be easy, but so far, it's proven to be hard to accomplish. Maybe it will be solved at an acceptable price level. It does seem ideal to be able to run off a dynamo when possible and off a battery when the dynamo isn't putting out current.
Actually, what I've got going is pretty good.
This is one of those cheap mini-racks that Nashbar used to sell complete with a miniature pannier set. The transformer and battery are neatly tucked into the pocket on the left. The headlight is made for handlebar mounting, but the improvised mount shown (consisting of a small piece of handlebar and a zip tie) is remarkably robust. I realize it's not going to win any style points, but this is all about function over form.