I wrote previously about Innovation following Infrastructure and this is basically the other side of that coin. I recently was introduced to the pedal-a-watt device its a device that turns your bike into a stationary bike with resistance provided by a generator that actually puts power into your home electric lines, offsetting some of what you use. Its a neat little thing and as someone that uses a stationary bike with a very noisy fan, I was excited to get one. I had my credit card out to pay the $45 until I realized that $45 is just the shipping and the device is $399! More than my old stationary bike. I put away my credit card and moved on.
Is $399 worth it or not? Like most consumers, I'm not rational about what I'll pay, I anchor on other goods, in this case my old stationary bike. The problem the pedal-a-watt has is two fold. 1) they are not leveraging the economies of scale of Asian manufacturing and 2) the device I anchored against is. If I have learned one thing about innovating consumer products in my career, its that you can't go against the flow of an established supply chain, or, like the pedal-a-watt, your innovations are just swimming up stream. The good news for any innovator is that there is a ready and willing supply chain that's available to your idea, you just have to seek it out. So many Asian manufacturers are eager for new ideas, particularly those that come with technical expertise, that there's no reason to suffer through a situation like the above. Innovators need to start seeing Chinese manufacturing entrepreneurs as the potential partners that they are, and they will see that this is a golden age for people with inventions.

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Finally, an easy question!
"Is $399 worth it or not?"
Their site claims 125–200W for the average rider. Let's use 150W. If you ride for one hour per day, 365 days per year, that is 150W * 365 hours = 54750Whr ≈ 54kWhr ≈ $5.40. You'll also want the power regulator ($235) and probably powerpack ($365) and of course the cable to connect them ($30) for a grand total of $1075.
Now, you'll want to consider the time value of money (well, not really, even ignoring it, the answer is clear). You spend the $1075 today, and get $5.40/yr for however long the device works (lifetime warranty, so let's just be optimistic and say forever). Well, a problem is immediately apparent: 2% of $1075, a conservative inflation estimate, is almost four times the amount you're taking in per year! So, the payback time is, literally, never.
PS: These components are not expensive, even bought in quantity 1. You'd come in far under $1075, even if you assembled them by hand, and paid yourself $200/hr. This isn't a supply chain problem any more than Monster Cable's prices are.
I don't think there's any
I don't think there's any economics that makes human powered electricity economically viable no matter what (unless there is no other choice). A really fit person in a place where electricity is expensive could probably generate 5 cents of electricity an hour, so it really makes no difference what the cost of this device is by that measure.
However, as I said in the post, I currently have a stationary bike that I power a big noisy, annoying fan. This could potentially rid me of that, and I like the novelty of the energy going to some use. Based on that, the device has value, then the question is how much, and then, in my estimation the question becomes one of supply chain.
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