Bicycle generators and LED lights

[joseph2k]

I guess thats the problem, this site comes up blank for me.

so, I don't get it.

I get an advertisement to sell the domain name.

 

[joseph2k]

Thats just what I typed in for the filename; it could have been
anything.

Looks like link to a porn site to me.

Luhan

The link you posted looks like free site operator advertising to me.

 

[Robert Latest]

["Followup-To:" header set to sci.electronics.design.]
On Fri, 11 Aug 2006 15:32:51 GMT,

For my bike (nothing special, a nice simple road bike bought at a
garage sale) I would like to add a bicycle generator and LED lights.
[...]

If there are products like that on the market already, I do not want
to "reinvent the wheel" and I would rather buy one, but I am not sure
if such a thing is available.

At least in Germany you can't find anything BUT bicycle lights that fill
all these requirements. Actually halogenics are preferred for the front
light, but any decent backlight is LED (plus a gold cap to keep the
light on while you're stopped). Get a generator hub for max efficiency.

robert

 

[Don Klipstein]

So how big is the battery?

Oh, a 12V 4AH "gel" sealed lead-acid is somewhat smaller than a usual
brick and weighs close to or a little over a kilogram. That gives me
hope of a 6V 4AH "gel" lead-acid weighing about or not much over a pound,
maybe 1.5 pounds.

I would surely prefer to truck around a pound or a pound and a half of
extra weight than drive a generator!

How about NiMH? 5 good AA cells give you 6 volts to maybe slightly more
even under some load, with 2.2 AH or maybe a bit more.
Moderately higher-end NiMH cells of "subC" or "sub-C" size have 3.3 AH
capacity and weigh maybe 60 grams apiece, for a 6V 3.3AH battery weighing
300 grams (about 2/3 pound)! Somewhat better "C" size ones have 4 AH and
weigh 78 grams apiece, for a 5-cell battery weighing 390 grams or a hair
under 14 ounces!

How about Li ion? 7.2V 4 AH (four "18650" cells in series-parallel)
should weigh about half a pound. Just know well the necessary protections
against overcharge, overdischarge, and cell imbalance!

- Don Klipstein ([email protected])

 

[Homer J Simpson]

Oh, a 12V 4AH "gel" sealed lead-acid is somewhat smaller than a usual
brick and weighs close to or a little over a kilogram. That gives me
hope of a 6V 4AH "gel" lead-acid weighing about or not much over a pound,
maybe 1.5 pounds.

I would surely prefer to truck around a pound or a pound and a half of
extra weight than drive a generator!

How about NiMH? 5 good AA cells give you 6 volts to maybe slightly more
even under some load, with 2.2 AH or maybe a bit more.
Moderately higher-end NiMH cells of "subC" or "sub-C" size have 3.3 AH
capacity and weigh maybe 60 grams apiece, for a 6V 3.3AH battery weighing
300 grams (about 2/3 pound)! Somewhat better "C" size ones have 4 AH and
weigh 78 grams apiece, for a 5-cell battery weighing 390 grams or a hair
under 14 ounces!

How about Li ion? 7.2V 4 AH (four "18650" cells in series-parallel)
should weigh about half a pound. Just know well the necessary protections
against overcharge, overdischarge, and cell imbalance!

- Don Klipstein ([email protected])

A co worker went out riding every night. I built him a dirty DC charger and
he recharged his ordinary D cells repeatedly for many weeks and was well
pleased. This is also done for some mine helmet lamps.