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Aren't some US post offices 24/7? You could go overly cautious and have them at 400km intervals rather than 600km and if you miss one then it's not too much of concern.
So I just calculated that I had an approximate moving time per day of 15.30 hours so maybe something closer to 17 hours including non-moving time on the bike (quick toilet stops, putting clothes on, checking navigation, quick jump into a shop).
I slept with no power source 7 out of 13 of the nights on average for about 5.5 hours and I'd stop properly twice a day for 30 minutes in restaurant/cafe/MacDonalds with charging.
However I never really went under 50% and only on a few occasions did I have to start using my reserve battery. For example the first three days I slept outside so had no prolonged charging
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Unless the dynamo fails, I'm going to be using a dynamo, so let's just forget about battery lights for now, yeah? :)
Yeah, so you had time to recharge. If I'm going to be bivvying as much as possible and stopping as little as possible then I don't see battery power being practical. I guess it depends on what a riders goal and strategy is. For me, removing battery reliance would be great.
What happens when you get to the pre-arranged post-office to pick up your next battery and it's 3am?
What was your ride/stop time ratio?