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Thread: Dynamo Hub

  1. #1

    Dynamo Hub

    Is it possible and what would be involved to run my DS500 off of a Dynamo Hub?

    Thanks,
    Ben

  2. #2
    Hey Ben,
    I think that it would be possible, but not without some conditioning circuitry and a battery between the hub and the light. The basic idea would be to have a "throttling" battery charger that takes the input from the hub and creates a regulated output for "charging the battery," which would simultaneously be used to drive the light and keep the battery topped off.

    I believe you could use the B&M eWerk to charge a standing battery while using the lights.

    The eWerk is a very cool little device. Essentially, you would be continuously charging a 7.4V li-ion (2-cell) battery while simultaneously operating the light. You would want to be a little judicious about the power and mode settings, but I think you could pretty much operate indefinitely with a setup like this. Freezing weather, being the one exception. You wouldn't want to be charging the battery below freezing. I would caveat this with the fact that I think it would be wise to start with a fully charged 7.4V li-ion pack, so that you're never "forcing" too much current into the battery. The battery really would just be acting like a large capacitor. So, in that since, you wouldn't need a pack with a lot of capacity.

    You would set the output of the eWerk to 8.4V at 1.5 amps and you would have to use a Y-cable on the battery, with one leg plugged into the eWerk, and the other leg plugged into the light. It would be just a bit of custom cabling, but I think very doable. I haven't had anyone try this yet, so I'd be very interested to see how it works. I can't say with 100% certainty how well it would work, and it would be quite an expensive experiment, but I could certainly support you with the cabling that you'd need.

    Just a thought...

  3. #3
    Hi Stephen,

    Is there a way to charge battery packs with portable solar panels?

    Thanks.

  4. #4
    Quote Originally Posted by Utku View Post
    Hi Stephen,

    Is there a way to charge battery packs with portable solar panels?

    Thanks.
    Hey Utku,
    Yes, I think there are probably a lot of different ways that you could do this.
    Probably one of the easiest ways would be if you had a solar array that could output voltage in the 12V to 30V range, then you could just hook up one of these portable BUCK regulators:

    OR even better: One of THESE (same idea, just a little more refined)
    And then set the output voltage to 8.4 and the maximum output current to around 1 amp. The battery would then charge any time the voltage from the solar array was above 10 volts or so.

    Obviously you'd need to be a little handy with electronics to do this, but it seems very plausible. You would probably also want to verify the actual output voltage with a Voltmeter to insure that it did not go above 8.4V. There are a lot of portable panels out there that have an 18V DC output, and this would be perfect for use with the BUCK regulator.

  5. #5
    Hello Stephen. To piggy back off this thread, I was wondering if it's possible to charge the DesignShine battery packs with a USB battery backup. I own a USB power bank that I trickle charge throughout the day while bike touring. I use a smaller solar pannel (rated at 6.5W with a 5V/1.3A output).

    In any case, it would be really handy if after a day of riding (and charging the battery backup) I could connect the DesignShine battery to it at night to recharge. Let me know if you think it can be done.

  6. #6
    Quote Originally Posted by Utku View Post
    Hi Stephen,

    Is there a way to charge battery packs with portable solar panels?

    Thanks.
    It's possible but it wont produce a ton of charge.

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