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What can I charge from Son 28 dynamo? How?

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What can I charge from Son 28 dynamo? How?

Old 11-14-16, 09:46 AM
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What can I charge from Son 28 dynamo? How?

For brevets, rando and touring I bought a rebuilt son28 and B&M Luxos U headlight from Peter White and it seems to work fine. The Luxos U has a built in cable for charging. I've been having a problem figuring out what I can charge with it. Ideally I would charge a backup battery of around 5300ma that I would then use to charge other devices as needed.

The issue is that the Son28 only has available up to 500ma often less if the lights are on. The problem is that I haven't found any power packs that specify the ma needed to charge and time to charge at various ma input. I've tried a couple of power packs but they wouldn't charge after the discharge. My cell phone seems to need 1000ma to charge.

The ideal solution would be a power pack that utilizes 4 or 6 AA rechargable batteries but also has the ability to use standard AAs which could be purchased when rechargables aren't charged.

Other good solutions include a battery pack that can charge at 500ma and lower and that can be charged from usb dynamo hub while simultaneously powering my cell phone, gps or whatever.

Another, less desirable solution is battery pack that would charge at 500ma or lower but can't power other devices simultaneously.

Any solution should have small as possible size.

I found this, but don't think they are available any longer. https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1.

Anyone have this one figured out?
Thanks.
T
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Old 11-14-16, 10:10 AM
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there are many companies, in the market, offering rectifier/voltage regulators... AC, from the hub output to USB standard DC output ..

[you bought the headlight with that much in it. ]

perpetual free energy remains a mirage, so you need to pick one, of 3... lights, trickle charge or run the phone.


Bush & Muller of Germany may have something adequate.. Busch & Müller: USB-WERK
+ https://en.bumm.de/produkte/e-werk/e-werk.html & https://en.bumm.de/products/e-werk-us...e-battery.html


I see the top of the line Ortlieb bar bag includes electrical contacts in the mounting, so removing the bar bag with all your toys in it
is Quickly Done..





Last edited by fietsbob; 11-14-16 at 10:27 AM.
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Old 11-14-16, 01:49 PM
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I think some external batteries must accept a low current charge. I think mine might be one of them. I could check. Mine is an Anker Astro E1.
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Old 11-14-16, 11:37 PM
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Current isn't much of a question. Voltage is. If I recall correctly the dyno hubs are around 4-6 volts. For what it is worth, current is minimal from them also.

I have considered trying a dyno hub and using a transformer to step the voltage up. I have a 12v SLA battery, current one is 9Ah (9000mAh) but I have used a 7 and some other sizes over time. I run everything off of that battery that I can run off a car port/cigarette lighter plug - phone chargers, tablet charger, 2-way radio charger, etc.

From an electrical standpoint stepping the voltage up wouldn't be hard - the dyno is AC so a transformer would do it. You need a higher voltage than the standing voltage of a battery to get any current to go in to it. If the voltage is less no current can flow. If your generator/alternator/stator is putting out much more voltage the battery voltage (unless there is another regulation circuit) will pull the voltage down of the system to the battery voltage. What ever the output is, in watts, of the generator/alternator/stator will be what it is. You can't get more than its spec, and with any transformation, what you get ultimately would be less wattage than spec.

The problem with the dyno hubs is the overall wattage is low. In my case, with a 12v system, by the time I step up the voltage high enough to charge (15-17v) the remaining current will be so small it won't be worth it.

Ohms law - P=VI, where P= power (in Watts), V= volts, and I = current (in Amps). Or, moving the equation around - P/V = I . In doubling V (6 to 12v lets say) current is cut in half. Then add the transformation efficiency and the resultant power available is less. There is no such thing as a free lunch.

On the other hand here, what I have been doing on some rides is rig up a solar panel across my rear rack. In good sun I can get about 400+mA of charge current at 12.6-12.7 volts. That is over 5 watts of power. The current draw of my tablet charger and 2 way radio charger, while floating at peak charge, is in the 300mA range combined. That means I have enough power out of the solar panel to keep things charged without depleting the 12v battery as I ride.

Edited with some pictures Maybe these will give some here ideas on what they can do too.




Below are the 2 panels I have. These are PowerFilm segments tied together with tape and connected with solder wick. Combined current is about 1.5 amps in good sun (1 amp on the big one and 1/2 on the small one).



Below is the meter I use for power. This is showing the charge current, and voltage, right at sun rise. Blue is current - .14A, or 140mA. Voltage at this point is 12.7v. On a good day I can pretty much float the battery right there all day long while in-use.

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Old 11-15-16, 08:02 AM
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Originally Posted by noglider
I think some external batteries must accept a low current charge. I think mine might be one of them. I could check. Mine is an Anker Astro E1.
I have the same battery as well as an Anker mini 3350Ah lipsitick sized battery. They both require 5V/ 1A input but I am able to charge them both with my Shimano dynamo hub which puts out approx. 5A/ .5A. It takes a long time in the saddle but it works. If you are on a tour, you are riding all day anyway so no big deal.
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Old 11-15-16, 08:41 AM
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You mean 5V/.5A? Or something else?

So it makes sense for touring but that's a pretty special case. For commuting, it's not worth it for me at all. I'm rarely more than two hours away from a wall outlet.
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Old 11-15-16, 09:08 AM
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I've made battery chargers in the past, designed to charge a battery comprised of 6 AA nimh or nicad cells. These are a lot less picky than lithium-ion cells.

To use it to charge a USB device, you'd need to use a 5V regulator at the output of the battery. You'd probably want to add a circuit to avoid over-discharge of the battery too.

Having said that, it's not of much use to the average person. If you want to find an off-the-shelf solution, your best bet is to consult with other rando folks or check with people who manufacture products similar or close to what you are looking for. The folks at Sinewave Cycles might be your best bet....
Sinewave Cycles
I suspect they've been asked this sort of thing before.

good luck,

Steve in Peoria
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Old 11-15-16, 10:29 AM
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Originally Posted by noglider
You mean 5V/.5A? Or something else?

So it makes sense for touring but that's a pretty special case. For commuting, it's not worth it for me at all. I'm rarely more than two hours away from a wall outlet.

Yes, I meant 5V/ .5A. Well, the only time anyone would care about charging a battery is when for touring. Like you say, if commuting you just go home or to work and plug into a wall socket.
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Old 11-15-16, 10:58 AM
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I use a 'Goal Zero' charger that comes with 4 NiMH AA cells and can be charged with either a small solar panel or from USB. Since it's designed for use with the solar panel where the output varies I'd think it would work well off the variable current available from the dynamo as long as you already have the circuitry to have it output 5V DC.
https://www.amazon.com/Goal-Zero-210...oal+zero+power
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Old 11-15-16, 11:15 AM
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@prathmann, that's a clever device. If you're away from an outlet for a day or three, you can bring extra nimh cells which are available in some drug stores in Podunk.

@robert schlatte, I can imagine some people's workdays keep them away from outlets, but they don't have many hours on the bike on those days, do they?
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Old 11-16-16, 08:40 AM
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@robert schlatte, I can imagine some people's workdays keep them away from outlets, but they don't have many hours on the bike on those days, do they?[/QUOTE]

The point of my original post is that dynamo hub charging works and when you are on the road many miles from home, you can produce enough electricity to keep your devices functioning. You are not going to fully charge a 10,000mAh battery in a couple of hours or back and forth between work. It is going to take days of riding but that's what you are doing on tour anyway, so it's all good.
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Old 11-16-16, 10:59 AM
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I don't really understand why you would bother to charge anything on any kind of reasonable commute. My commute takes about a half hour, no really good reason to charge anything during the ride, and it would complicate the bike quite a bit. I wasn't very impressed by the charging capabilities of my Luxos, so I gave up on it. Everything I need to charge on the bike can be charged with a few lipstick batteries anyway. People seem to like the dedicated chargers better than the luxos, but I'm not sure if that's a capacity issue. I think I might try it again with charging a backup battery, some of those will do pass-through charging.
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Old 11-19-16, 12:16 PM
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There are already Phone auxiliary batteries .. to extend your Phone web surfing time.

but Charging from the Mains is a Lot faster. Re charge Both .. At Lunch.
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