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I want to conenct my phone/GPS to my dyno-hub during daylight, but have a switch to connect to lights at night
I know Softhema is supposed to be the best option, but they don't seem to be available any more.
DIY is another route.
But I've just found this: http://www.bike2power.com/lightcharge-bicycle-hub-usb-charger.html (on UK ebay for £45)
Anyone have any experience of them? Are they waterproof? Do they cope with high input power? (something the Kemo apparently doesn't)
I have the Kemo, it's been fine even at high speed. I wired it a little differently to recommended: instead of wiring it directly to the hub and then switching the light from it (which gives you the choice of USB or lighting but not both) I wired it to the rear output from the front lamp (which gives front light and USB at the same time, but no rear light - though I guess you could switch a rear from the USB... in any case, I was using a battery rear at the time). I like to have lights on full-time so to my mind USB charging is only useful if it's concurrent with lighting. (FWIW my hub is an XT and my front light is a Cyo.)
Your other option is a Luxos... only just got mine and haven't tested it out yet, but it appears it should manage USB and light at the same time. (But didn't I spot a Revo on your bike... thought that had a USB out, or am I mistaken?)
If you wanted to borrow my Kemo for a bit then you could.
Or there's The Plug, of course... the Mk. 1 can probably be had for a vaguely reasonable price. And the German shops were doing good deals on e-Werks not long ago.
Having said all that, don't dismiss the option of a normal USB battery. They make me slightly nervous as I have Fear of Finite Power, but in practice they've always done the job very well. I only needed one small cell to keep my phone tracking (at a reduced rate) and posting to the web for 37 hours.
[url= http://www.arenddeboer.com/diy-hub-dynamo-usb-charger ]Got a soldering iron (or a mate with one)?[/url]
Yes, its for a Revo which does have the "smartport" output, but that's only 0.6w, so slower to charge my phone. But I guess that keeps the Kemo happy.
I need more than a single additional battery as its for multi-day rides (specifically the LEL)
cheers drlex, DIY is an option I may yet go down.