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Pass-through charge is an obligatory feature in my opinion... so you don't have to care about how much charge gps/mobile/power-bank have... just leave it all connected, and only disconnect when you get to a climb that really hurts and don't want to think about the little watts you must be losing with the dynamo dragging.... or when night comes and lights should get all the dynamo power. A switch for those two moments would be awesome :), but disconnecting/connecting a usb cable is not so bad one-handed.
I've the Goal Zero Flip 20. Works great, maybe the 10 version could be enough, but I could recharge the Edge 1000 at least 3 times before needing to re-charge the power-bank. Its not waterproof... I didn't care about that, they have the Venture 30 for that, but was too heavy for what I needed (just 1000km, not TCR/TransAm like you)
Yes the electrical switch is what I was thinking about, but didn't have time to do it myself before the 1000km brevet. Anyway at higher speeds there will be heatsink, but at least it won't get it when not being used. Heat wasn't a problem, I just were a bit careful before touching it.
Yes @acharnley I'll get the D1 fixed outside of the framebag (hopefully the new titanium model!), did it for the first 400km, but little rain came the first night and didn't care to get it fixed outside again for the rest of the ride. Both Garmin Edge 1000 and iPhone SE where complaining for Power Lost when riding at variable speeds, so I just wanted to do both things at the same time.... recharge power-bank and device.