• This article suggests an efficient dynamo will cost you up to thirty seconds over 100km when switched off and up to nearly six minutes switched on.

    Agree with @hippy's point about one less thing to think about, there is a bit more stress with batteries. There's also a little bit more bulk if you are really short of space, and a bit more hassles if it rains to keep stuff dry.

    But I think the gains are bigger. Those articles aren't written with ultra racers in mind. The power output for most of us is lower, after a couple of days, so losing 6 W when you're only putting out 80W is more damaging.
    But even on those numbers, 6 min per 100km is 5.5 hours, or 100+km, so still worth having. (It's an autumn ride so quite a lot of dark, + gadgets, means people with dynamos would use them most of the time).

  • Those articles aren't written with ultra racers in mind. The power output for most of us is lower, after a couple of days, so losing 6 W when you're only putting out 80W is more damaging.

    Hadn't thought of that.

    But even on those numbers, 6 min per 100km is 5.5 hours, or 100+km, so still worth having.

    That did occur to me, but I forgot to mention it.

    (It's an autumn ride so quite a lot of dark, + gadgets, means people with dynamos would use them most of the time).

    I hadn't thought of that either: Oz = sunshine to me. But that could swing both ways, as more use means more frequent charging.

    Ultimately though, an ounce of experience is better than a pound of internet wisdom, so I'm not going to argue with you: I'm just trying to bump my post count...

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