Is it possible and what would be involved to run my DS500 off of a Dynamo Hub?
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...
Is there a way to charge battery packs with portable solar panels?
Originally Posted by 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.
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.