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  • A device that accepts 3W of charge power will take twice as long to charge. If the 1.5W is less than its power consumption it will indicate it is charging but will discharge (more slowly). 3W is on the threshold for many devices (smartphones especially). Personally I wouldn't buy a 1.5W dynamo.

    The 3W XT version isn't much more, it's what I use (over here in the UK it's called the 3N80). There's also the cheaper 3n72 (LX) version if you can stomach the 100g weight penalty. The internal electrics are identical. These are the only Shimano hubs worth considering in terms of resistance -v- efficiency.

    As I recall the 3n72 was painted black and became an Alpine. Can't remember the model number however.

  • The Alfine versions are DH-S501 (3W, a DH-3D72 in disguise) and the DH-S701 (1.5W a DH-1D70). Dont bother unless you want matchy Alfine logos, get the DH-3D80/DH-T785 instead.
    The DH-3D80 and DH-T785 are both sold in the UK, polished silver and anodised black respectively, and are identical other than finish.

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