dynohub chargeing a battery

**Dan** · #1 10-12-2009, 01:33 PM

I am trying to figure out how to use this; Front Hubs, Sturmey Archer Dynamo Drum brake Front hub 36h, Silver, HU2200 @ eBikeStop.com - The online supplier for all your cycling needs... to charge a battery. Then run lights (and cig lighter/power supply for GPS/cel phon recharger, lol, Y keep it simple)

I have been reading for hrs and am missing some thing. Couldn't a resister and a regulator safely charge a 6V battery?

TBolt USA, LLC » Pit Bike Engine Parts » Electrical » VOLTAGE REGULATOR 6V

Please use small words and type slowly as I can not read fast

**Dan** · #2 10-13-2009, 06:05 PM

Oh come on, Michael Richards, Seinfeld, Cosmo Kramer, Sound Bite

Venice Motor Bikes · #3 10-13-2009, 06:22 PM

In theory, there should also be a way to charge a battery from the white wire.

**Dan** · #4 10-14-2009, 06:37 PM

Was thinking about that VB. Have seen folks use it to trickle charge and have asked but never ended up being explained. That's a cool thought. I really have to learn the electrical side of things. Comes up over and over.

The bike I want to get the dyno/brake hub for is a 4 banger.

Ordering an Atlas. Big heavy cruiser. Really looking forward to this build. Gonna go all out

camlifter · #5 10-15-2009, 06:18 AM

thats the same hub i'm using, don't have it wired up yet, my concern is, if the battery gets to low will it draw to many amps trying to recharge and burn up the hub, i guess i'll find out the hard way.

**Dan** · #6 10-15-2009, 04:01 PM

Cool, is great to see the world renown "ACME LABS" working on this so we can share information on the stuff we blow up and stock destroying, snork.

In reading an article by Sheldon Brown, my concern is over charging the batt and blowing off intimate aspects of my anatomy.

In trying to learn this, I am going to use a gage. (voltmeter or a Ammeter?) and some sort of toggle switch to disconnect if needed.

Amazon.com: Sunpro CP7954 Electrical Ammeter Gauge - Black Dial: Automotive

WayneC · #7 10-15-2009, 04:01 PM

You need to convert the AC to DC with one of these.
Full-Wave Bridge Rectifiers for Power Supplies - RadioShack.com
It's quite simple. The + and - terminals connect to the Battery + and -. Then the two terminals marked by the ~ get attached to the dynamo. It doesn't matter which because it is AC.
I used this on my 12v,6W bottle dynamo until the bearings went on it. I have a new dyno on order and found this -- TNC Scooters (Scooter Sales and Service) -- to use with it. It regulates for 12V and rectifies the AC to DC in one unit. However, that unit is for 12V. I think the S/A hub is 6V, 3W.
WC

**Dan** · #8 10-15-2009, 04:14 PM

Very cool Wayne. Thanks!

**2door** · #9 10-15-2009, 05:37 PM

Just lurking but I will add that a solid state voltage regulator couldn't be that hard to find, or make. Almost every small and large battery charger I've seen, except for very old ones, have a regulator built in that will reduce the charging rate as the battery voltage approaches full charge.. WayneC is correct in that the white wire produces 6 volt AC (alternating current) and that will need to be rectified to DC to charge a battery. As he said, a full bridge rectifier wired in series with the charging circuit will take care of that. I would think a little searching would come up with a small unit that would do both regulate and rectify; probably no bigger than a matchbox.
Radio Shack used to have a project book for hobbiest to build small electronic devices and circuits. I think I have an old copy. If I find anything I'll get back here.
Tom

**Dan** · #10 10-15-2009, 08:07 PM

Fascinating thought Tom. Could it be a simple rigging some thing like this between the dyno and battery?

6 Volt 4 Ah Power Wheels Battery Charger: BatteryMart.com

if that would work, yeeha! Light and small.

Is to be used with the soon to be patented "2 Door motor bike lighting system"

(Tom made a headlamp from an emergency hallway light. The ones you see in office and apartment buildings that come on when the power goes out. Is really kool and was waiting to do a thread on it until I actually put it on a MB)