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  1. #1
    Randomhead
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    Shimano 1.5 W dynos, anyone using one?

    They are by far the cheapest way to get a disc compatible dynohub. Since I've never measured the draw of any of my lights, I am left wondering if they would be sufficient. I have a couple of utility bikes in the plans that would be a lot cheaper with one of these hubs

  2. #2
    Senior Member CaptCarrot's Avatar
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    Got any links or prices?

    I have the DH-S501 Alfine Dynohub. I picked it up at Rose Versand for 56 GBP and that is disc compatible. A nice hub to, and is 3W not 1.5W

    http://www.rosebikes.co.uk/article/s...501/aid:333819
    Not as green as I might be cabbage looking!

  3. #3
    Senior Member DiegoFrogs's Avatar
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    I only see the DH-1N70, which doesn't appear to be disc brake compatible.

  4. #4
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    Shimano 3D30 6 bolts from Germany are around $30-$40 last I checked.

  5. #5
    Randomhead
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    starbike is $80

    Quote Originally Posted by DiegoFrogs View Post
    I only see the DH-1N70, which doesn't appear to be disc brake compatible.
    same vendor has centerlock disk compatible hubs for $40

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    It would be way underpowered too. Stick with 3w.

  7. #7
    coprolite fietsbob's Avatar
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    Why do you want only half the typical power output?

  8. #8
    Randomhead
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    I'd be happier with full power, but at the prices they are selling at I am interested enough to try to find out if I need any more power. No point in having more power than I need

  9. #9
    Senior Member
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    Quote Originally Posted by unterhausen View Post
    I'd be happier with full power, but at the prices they are selling at I am interested enough to try to find out if I need any more power. No point in having more power than I need
    A computer USB port is 2.5W. 1.5W isn't enough to even charge a phone. Considering the cost of building a wheel anything under 6W probably isn't worth the money. Most modern LED headlights are ~100 lumens/W, halogens are more like ~30-40 lumens/W. That should give you some idea.

  10. #10
    Randomhead
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    the standard hubs are .5A*6v = 3W, although people who have measured it say they deliver up to 12W. I assume there is a similar discrepancy with these hubs

  11. #11
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    Quote Originally Posted by unterhausen View Post
    the standard hubs are .5A*6v = 3W, although people who have measured it say they deliver up to 12W. I assume there is a similar discrepancy with these hubs
    Standard hubs give about 3W when measured with a 12 ohm load (typical incandescent or halogen) at speed of 10mph (the standard). With that load the typical dyno hub peaks at roughly 4W output. With smaller loads (24 ohm) power is typically peaks at between 5 and 6 watts for typical cycling speeds. For speeds of 30+mph powers of 8-9 watts have been reliably reported. Useful if one has mountains to go down (not counting on that power level when climbing) or if one is able to reliably produce the ~1,000 Watts of human power to propel a bicycle at 30+ mph on level ground--in short if someone is in the same condition as elite bicycle racers.

    With efficient LED lights, I would suspect peak output from the 1.5W hubs would be in the 2-3 W range (for normal riding speeds). Depending upon the light, your requirements, and your typical speeds that may be more than sufficient. Unfortunately the only way to really tell would be to get such a setup and try it. I haven't encountered any reports of how those 1.5W hubs perform. If you do try it out please post your impressions!

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