Join Date: Jul 2008
Location: Austin, TX
Bikes: Giant OCR2, Bridgestone RB-T, Bike-E, Vision R-40, Novara Safari
Originally Posted by saltytri
"Would it be posible for a modern generator hub to generate enough electricity to power a few 6 inch speakers and maybe a sub."
Simply put, no.
Less simply put, maybe.
Do you already have your stereo set up? If so, power it with a 12v gel cell, and get a cheap ammeter and measure the current drawn. For example, I've found that my stereo is quite loud at 12 watts total being used. The size or number of speakers used really isn't much of a factor -- what matters is how efficient your amp is and how loud you've got it set.
Now, most hubs provide 6v and about 0.5 amps -- 3 watts. AC. 12v of steady DC is needed to use auto stereo equipment, so you'd need to rectify the power, smooth it out and increase the voltage, and even then three watts is pretty minimal.
You might be able to find a pair of computer speakers that works on a few watts and 6 volts. (With the music coming from an iPod or something similar.) Won't be as loud as car audio gear, but can still be pretty loud. You'll probably still need to rectify and smooth the power, however. Or just use a radio -- 3 watts will far more than enough for a small one.
Or maybe you can just go ahead and use car stereo gear at 12v and carry a gel-cell battery, and rig up your generator to charge it (you'll still need to get 14v or so DC, of course.) The charging will give you somewhat longer runtime and will let you claim that it's at least partially human powered. Or totally human powered if that's the only way you charge the battery.