Alternator And belt drive

[cloakedvillain]

I like over the ear speakers.

 

[DAMIEN1307]

I like over the ear speakers.

Are you referring to "headphones"???...lol.

 

[cloakedvillain]

The proper term is open ear head phones but the idea is to have the speaker by the ear without covering the ear so outside noises don't get blocked near as bad.

 

[Herman Klutz]

The generator from a John Deere 330 or 322 lawn tractor and an equivalent voltage regulator would be a good choice to build on. Belt driven, small and a good fit.

 

[cloakedvillain]

Those little 20 amp permanent magnet alternators are cool but: 20 times 14.4, 288 watts, efficiency of about 60%, I'd estimate about a .64 hp being demanded from your engine at full load. Not much to spare with a china doll.

Makes more sense with an industrial engine powered bike like a predator 212, tilletson 224, honda 200, stuff like that.

 

[Chainlube]

Those little 20 amp permanent magnet alternators are cool but: 20 times 14.4, 288 watts, efficiency of about 60%, I'd estimate about a .64 hp being demanded from your engine at full load. Not much to spare with a china doll.

Makes more sense with an industrial engine powered bike like a predator 212, tilletson 224, honda 200, stuff like that.

A friction drive in reverse engineering. The wheel turns the hub that drives the belt going to the alternator. Even makes power going down hill.

 

[robe]

A friction drive in reverse engineering. The wheel turns the hub that drives the belt going to the alternator. Even makes power going down hill.

Way back in the dark ages before hi-tech batteries, if you wanted a light on your bike you had to have the little 6 volt dynamo that rolled on the tire. They still make them in some dusty back water of a shop in China.

Amazon.ca

 

[cloakedvillain]

Still plenty popular in europe and asia where cycling is something you do to get around rather than fun or exercise. https://www.dutchbikebits.com/

 

[Copygod69]

Are you referring to "headphones"???...lol.

Still plenty popular in europe and asia where cycling is something you do to get around rather than fun or exercise. https://www.dutchbikebits.com

Speakers for the win and thanks for the website

 

[SirLurksAlot]

A friction drive in reverse engineering. The wheel turns the hub that drives the belt going to the alternator. Even makes power going down hill.

Still requires the same hp to spin it up enough to provide the power. Minimum required is approx 1.6w of engine power for every watt of electricity produced at common efficiencies. The 20amp example would consume 240W minimum of engine power at 20 amps output at 12v/20amp and 100% efficiency, which is impossible irl... More like 440W at the nominal output rating of 13.8v/20amp irl. Even the old school 6v wheel-drive generators used for tail lights produce noticeable drag when providing less than 1 amp at 6v (~6watts) . Li ion batteries/external charger ftw!
Edited to correct math brain farts