I see a couple of pre-made ones for sale:
I don't think I can beat the second one for the price of the bike stand plus dynamo. But it seems like they are way overcharging for the "12 vdc regulator", at $235 -- shouldn't something like this suffice? http://www.solar-electric.com/ss-20l.html (A charge controller intended for charging deep cycle batteries from solar cells.) It's admittedly only rated for 20 amps, which is below spec for 400W of bike power at 12V, but research suggests I'm likely not capable of making 400W with my legs.
For storing energy, this very forum suggests my best bet is two 6 volt golf cart batteries, hooked up in series.
For feeding energy back out, probably an el-cheapo cigarette-lighter inverter (I understand these are 'modified sine wave' inverters?) like this guy: http://www.google.com/products/catalog? ... 7632061747 (It may end up that we're better off just getting all our lighting/sound/etc. in 12VDC, and getting a 12VDC regulator.)
I'd love to hear from someone with appropriate experience for a system like this:
- Can I combine these components safely in the way I desire?
- Can I use that charge controller to safely charge 2x costco 6V golf cart batteries in series? Will cell balance be an issue?
- If my frantic pedaling somehow miraculously produces more than 20 amps worth of juice, will the charge controller explode? Can I design the system to sink the excess power safely, without doubling the cost to get a 35 amp charge controller?
- Does the charge controller obviate the need for a blocking diode (sounds like it should?)
- How does one connect the actual load (the inverter or 12VDC regulator) in a system like this? Straight across the battery?