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Something like this: http://www.bumm.de/de/produkte/stromversorgung.html
But I think it's a really smart choice going di2 for bike packing. Di2 requires a lot less effort to shift, needs far less adjustment of your gears and you can easily do 3000km on a charge. In the 2 years I've used di2 I have never had any malfunction..
And if you're going to go further than 3000km without a charger, than you can easily carry an extra battery or two.. They're only 56gram!
Jaap-
Yeah it's great until something like this happens http://www.bikeforums.net/road-cycling/1068175-di2-shimano-failures-caution.html
Unfortunately this sort of issue and anecdote seems to be far too common ...
Don't get me wrong, I'm not anti Di2 or eTap, just personally wouldn't want tech I can't fix without a laptop or warranty claim roadside
🅑🅐🅣🅣
@Jaap
You'd need some sort of inverter or USB charging pack - dynamos are AC out, di2 are DC in.
But you're right, it is possible. I was being facetious about the battery - my point was rather more it's still a bit of a silly choice for touring / packing. Battery life / charging aside, if anything goes wrong with any part of the charging / di2 system out in the (a) field, life might get very difficult quite quickly and I would rather a relatively simple and ubiquitous mechanical system to fix.
Admittedly looks like a Transco/enduro sort of rig so horses for strange courses
Edit; uses an igaro for charging.