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Low-tech Magazine has built a bicycle generator for a public exhibition on energy at the Pavillon d'Arsenal in Paris, France. Their two other bike generators can be seen and experimented with in Rotterdam, Netherlands and Barcelona, Spain.
In October, we built a third energy bicycle during a workshop at the House of the Future in Rotterdam. This bicycle generator is now used as an energy source in the community center. The House of the Future is open to the public, for details see their website and instagram.
In a future article, we will cover the construction process and technical details of these two new muscular power plants. These machines are based on spinning bikes and are more powerful than the first bike generator we built.
With electricity prices continually hitting new record highs, maybe the market is the EU?
[The Toaster Challenge can help put this energy-generation idea into perspective. --hubie]
(Score: 3, Insightful) by looorg on Sunday December 10 2023, @01:29PM (11 children)
It could have been interesting, and educational, if they had some little chart that showed how long you would have to pedal for to charge common items -- like how long do you have to be on the bike to charge your phone or have the lights on etc.
The best I can find in the article was a few layers down about building a bike powered air compressor but that is still somewhat lacking in how long it actually takes to fill the air tank.
(Score: 5, Informative) by pTamok on Sunday December 10 2023, @02:27PM (4 children)
https://en.wikipedia.org/wiki/Bicycle_performance#Energy_output [wikipedia.org]
On that basis, you can probably use 200 Watts per hour as an approximation.
IPhone batteries vary from about 4.25 Watt hour to 17.1 Watt Hour capacities. ( https://www.macworld.com/article/678413/iphone-battery-capacities-compared-all-iphones-battery-life-in-mah-and-wh.html [macworld.com] ), so assuming no losses (which is implausible), it's take between 5 and 10 minutes to generate enough power to charge an iPhone fully.
A laptop PC has a battery capacity of 'about' 50 Watt-hours. That's 15 minutes of cycling, again, assuming no losses.
This calculator
https://www.omnicalculator.com/physics/water-heating [omnicalculator.com]
tells me that at 100% efficiently, 200Watts will boil a quarter of a litre of water (enough for a cup of tea) in 7 minutes,
A 'typical' PC and monitor will probably add up to 200 Watts power draw on their own. You would need to pedal continuously while working. As for gaming, you'd need several people pedalling to allow you to run a semi-decent graphics card and powerful PC.
(Score: 3, Informative) by captain normal on Sunday December 10 2023, @09:49PM (3 children)
A 24" LED monitor uses less than 30 watts. You'd have be driving a pretty big monitor to suck up 200 watts. The typical laptop uses far less than 30 watts.
The Musk/Trump interview appears to have been hacked, but not a DDOS hack...more like A Distributed Denial of Reality.
(Score: 0) by Anonymous Coward on Sunday December 10 2023, @10:06PM (1 child)
And one litre is a damn big cup of tea.
(Score: 1) by pTamok on Monday December 11 2023, @07:41AM
Sure. There are people who have 'pint-mugs' of tea, which is a little over half a litre. But that's why I said a quarter of a litre, which is 250ml, or just under half a pint.
https://www.amazon.co.uk/pint-tea-mug/s?k=pint+tea+mug [amazon.co.uk]
(Score: 1) by pTamok on Monday December 11 2023, @07:38AM
A 'typical' laptop PC, yes: but a 'typical desktop PC has a higher power draw. I didn't make myself clear.
(Score: 5, Informative) by JoeMerchant on Sunday December 10 2023, @04:32PM (5 children)
It's not just how long but also how hard you pedal.
My Physics 101 prof brought in a couple of generator bikes to demonstrate in 1985. They had variable loads 0, 25, 50 and 100 watts IIRC. Switch on a light and add load, 3 lights, max output with all on: 175W.
I biked to class and all over town at the time, I biked 50 miles a day for weeks and a time a couple of summers later without any special preparation or training, in other words I was 18 years old and in reasonable shape.
25W output was sustainable, but tiring for me, I probably couldn't maintain that output for more than an hour. 50W was hard, and I could only maintain the 175W output for maybe a minute.
I may be mis-remembering the load levels, or maybe there was a significant inefficiency in the generator system, it seems like even today I could output roughly what my 250W rated eBike motor outputs for a minute or two, but regardless, 1000W is out of the question for a reasonable human powered generator to sustain for any length of time. Better to put 2 or 3 standard solar panels on the roof.
🌻🌻 [google.com]
(Score: 1, Informative) by Anonymous Coward on Sunday December 10 2023, @05:08PM (3 children)
That Toaster Challenge link shows what you're talking about where a Olympic-class cyclist was powering a 700W toaster.
(Score: 4, Touché) by JoeMerchant on Monday December 11 2023, @12:47AM
Seems like the toaster challenge setup had the same problem I complained about with the generator bike in physics class, gearing was too low - making you pedal too slowly for optimal power output. It's still hard, but when it bogs down like that it's even a bit harder. Robert might have made it to medium brown on the toast with more rider friendly gearing.
🌻🌻 [google.com]
(Score: 3, Funny) by ElizabethGreene on Monday December 11 2023, @01:23AM (1 child)
Special thanks to whoever posted that, BTW. That is an impeccably beautiful man.
(Score: 0) by Anonymous Coward on Monday December 11 2023, @02:43AM
Here's one of the best sprinters and kilo riders to come out of USA, https://www.renehersecycles.com/people-who-inspire-us-nelson-vails/ [renehersecycles.com]
They all have enormous legs. When I saw Vails at a velodrome I was still a skinny kid...and his legs had about the same circumference as my waist.
(Score: 3, Informative) by pTamok on Sunday December 10 2023, @05:43PM
I've always understood (perhaps incorrectly) that peak output power for a human is about one horsepower, which is 735.5 Watts, You can't sustain that for long.
Wikipedia gives the following (cited) tidbit: "Over an 8-hour work shift, an average, healthy, well-fed and motivated manual laborer may sustain an output of around 75 watts of power." ( https://en.wikipedia.org/wiki/Human_power#Available_power [wikipedia.org] ) , and if you figure that as the input to an electrical generator or mechanical device, which will be less than 100% efficient, the actual usable power will be less.
The BBC had a program where they powered a pretty standard house by using teams of volunteers on bicycle generators, adding more people as the demand went up ('Bang Goes The Theory: Human Power Station' [road.cc]). They didn't manage to meet the demand.
(Score: 4, Interesting) by quietus on Sunday December 10 2023, @04:29PM (2 children)
Here's some recent data [www.creg.be] -- the first graph shows the cost of electricity for households in Belgium, France, Germany, the Netherlands and the United Kingdom. (The second graph shows the same info, but this time including VAT.)
Just taking the German data, 3,500 kWh -- a normal usage for a household, per year -- cost €1500 in November 2022; for the same amount of electricity usage you'd be paying around €600 in November 2023. This evolution is also to be seen in the Dutch and Belgian prices.
The UK and France show different trajectories: French prices have edged up slightly, but remain the lowest in this group of European countries, while UK prices only show a moderate decrease.
The prices given are prices on the open market (commercial prices), and do not take into account subsidies and the like (social tariffs) for households. As an example, for Belgium, social tariffs amounted to minus €392 for the last months of 2022, and minus €588 for the first months of 2023 up to March.
(Score: 3, Interesting) by JoeMerchant on Sunday December 10 2023, @04:39PM (1 child)
So, a highly trained athletic human powering 125w of bike generation 8 hours a day can supply 1kWh per day, get ten of these people riding in shifts and you might power one typical house GF erman house and reduce your power bill by €150 per year per rider
Do you think you could feed them sufficient calories for €0.41 per day?
🌻🌻 [google.com]
(Score: 3, Funny) by Opportunist on Sunday December 10 2023, @05:38PM
Hmm.... the prices for sunflower oil are way, way up since the war... maybe lard could be used?
(Score: 1, Touché) by Anonymous Coward on Sunday December 10 2023, @04:58PM
Soylent has prior art.
https://www.youtube.com/playlist?list=PLX9Z7G8_FfJ_jQskUnCdUYfQ-fn6Z4bGI [youtube.com]
(Score: 3, Funny) by Opportunist on Sunday December 10 2023, @05:35PM (4 children)
We solve our energy problems and the incoming unemployment problems at the same time.
(Score: 2) by turgid on Monday December 11 2023, @09:03AM (1 child)
Don't give them ideas.
I refuse to engage in a battle of wits with an unarmed opponent [wikipedia.org].
(Score: 2) by Opportunist on Monday December 11 2023, @12:24PM
You really think they depend on me for that?
(Score: 2) by maxwell demon on Monday December 11 2023, @05:32PM (1 child)
They'll find a way to make people pay for the "privilege" of generating power for them. Paying the people? How quaint. :-)
The Tao of math: The numbers you can count are not the real numbers.
(Score: 2) by Opportunist on Tuesday December 12 2023, @12:12AM
Who said anything about paying anyone?
I promised jobs. Not wages.
(Score: 2, Informative) by pTamok on Sunday December 10 2023, @05:55PM
PedalPC: My Human-Powered Office" [pedalpc.com]
PedalPC: How Much Electricity Can a Human Generate?" [pedalpc.com]
(Score: 2, Insightful) by khallow on Sunday December 10 2023, @08:01PM (1 child)
If they really want to lower the price of electricity (and I'm not sure the policy makers do), more nuclear power and more natural gas wells.
(Score: 5, Insightful) by Anonymous Coward on Monday December 11 2023, @02:54AM
> Human generated electricity is insane.
Human generated electricity is instructive.
ftfy
It helps people understand what Bucky Fuller meant when he talked about "energy slaves":
- In antiquity, rich people had actual human slaves (and animals) to provide the power for their "high energy" life style.
- Now, anyone that can afford a car can use a small motion of their throttle foot to control the same order of magnitude of power as could be produced by a regiment (~800) of soldiers (or slaves). When it comes to energy use, we really do live like kings, or better.