Bike generator - DIY Experiments #11 - All about human power
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- เผยแพร่เมื่อ 17 มิ.ย. 2024
- • Our Facebook page: / diy.experiments.youtube
• Condensed script of the video:
Today we are gonna make experiments with human power. Our goal, will be to produce as much power as possible by ourselves. We will first try our set up which transforms a regular bike into a generator, then we will give you interesting information about human power.
The most difficult point is to link the generator to the bike’s wheel, we use a scooter wheel held to a wooden mount. The torque, that means rotational force, is transferred with screws till the motor sprocket. By adjusting wisely the pressure between the bike and the scooter’s wheels, it’s possible to communicate power with a reasonable efficiency. The size of the scooter wheel has been chosen so that a normal cycling cadence makes the generator revving around it’s rated value.
We sit on the bike and go for a voltage measurement without any load.
We reach easily 36V, the rated voltage of the motor, it’s then possible to reach up to 50V. Ok for the voltage, but power is voltage times current, and for now the current is 0 as there is no load, so no useful power is produced in this test. That’s also why we don't feel any resistance from the pedals.
Now we’re gonna try 21W car light bulbs, and to get straight to the point, we’re gonna start directly with 9 bulbs, in a 3 series times 3 parallel layout.
When the voltage will exceed 36V, the power will be at least 189W.
It’s a success, and it's not even difficult.
We managed to produce up to 555W but can we produce more? This power corresponds to the output power of the generator, but from the pedals to the resistor there are many losses, in the bike’s mechanics, between the scooter and the bike’s wheels and finally in the generator. The loss in the generator can be calculated precisely. Its efficiency is 80% in our test, it means the mechanical energy at the motor shaft is around 700W.
It's more difficult to estimate other losses but they are not negligible, we estimate that the mechanical power on the pedals close to 900W. More recently, we managed to produce up to 750W with another simpler set up. It’s based on an efficient 1000W brushless hub motor. The overall efficiency is also better thanks to a direct mechanical transmission. The power on the pedals is again around 900W but we retrieve more of it. The energy is stored in li-ion cells, and it is possible to look for the most suitable cycling cadence by shifting the number of cells in series.
Here is simple test to estimate the maximum power we can deliver. This consists of climbing a precise height as quickly as possible. Overcoming gravity consumes energy, that can be released downhill. By measuring his weight and the duration of the climb, it’s possible to calculate the power, in our test it’s at least 1075W.
Of course, it’s impossible to hold this tremendous effort a long time, our muscle stock of ATP, which allows us to make an intense effort at any time, runs out quickly, and slower metabolisms are used over time. A healthy person can go up to 1000W during seconds, but for one hour, the maximum is around 250W.
For an 8 hours working day, it would be something like 125W only. It makes only 1 kWh of energy per working day. Doing this work as a job for an entire month would pay off less than 3 bucks of electricity. Even if it would be enough to supply many low consumption devices, the overall consumption of these devices can be insignificant compared to just one high consumption device.
Now a question, is human energy environmentally friendly? It’s possible to compare our body to an engine. For instance, we can simplify our metabolism by the combustion of sugar and the petrol engine chemistry by the combustion of the isooctane hydrocarbon. Both reactions only release water vapor and carbon dioxide, the famous “CO2”. If we limit our environmental study to CO2 only, responsible for global warming, the amount of work released by unit of CO2 emitted is twice as more with the engine. Clearly, in this aspect, the petrol engine is the winner, but an average car engine is 500 times more powerful than its driver continuous power capability. The best aspect of human power is not its energy or CO2 efficiency, but it’s sobriety. Sport is necessary for the balance of the human body and using its own energy for an useful purpose is always a plus.
Another major point is the origin of the chemical energy. Oil comes from the lithosphere whereas the food we eat comes from the biosphere.
The carbon cycle in the biosphere is quick and well balanced, the CO2 emitted by an human has been captured and will be captured by food plants.The CO2 emitted by the combustion of hydrocarbons found in the lithosphere is highly unbalanced, with current rates, only 5% of the carbon returns to the lithosphere so 95% of current emissions will remain in the atmosphere as long as nothing is done to change that.
Thanks for watching! - วิทยาศาสตร์และเทคโนโลยี
This is the best video I've seen on TH-cam. Intelligent precise. No unwanted information.
Thanks, this is the aim of our video, bring high value information that required days of research and an entire life of curiosity
- Best vid: Full Ack, all the relevant numbers given, which I want for my own build
- Precise: Full Ack
- No unwanted information: Total fail here though - as a physicist I can't stand the CO2 brainfuck any longer, in a totally unrelated video. So now we have to also believe that there is good and bad CO2, in addition to all the other wild hypotheses, like the positive water vapor feedback loop which is hardcore if you think about it...
But apart from that, again: Super vid - looking forward to wiring up my new desk cycle ;-)
We have serious power issues in South Africa currently. If budget allowed it and you told me I have to cycle for 1-2 hours in a day to charge a battery so I can have lights at night, I'd do it no problem. Keeping fit and generating power, this seems like a no brainer
Have waited a long time for the English version . Great video
Thank! And this video has 25% new content 😇
But such an accent！😱
Where is he all these months
Great video! You have to make a new video soon. This is one of my favorite TH-cam channel now.
Hey r u still alive ?
Hey, how are you after a year from writing this comment?!
Nice job. Very useful.
Oh this is such a wonderful video and only 61.000 views in two years!
Liked and subscribed! :)
Very informative and amazing video
Make More Make More Love from India ♥️🇮🇳
that was awesome
good video man
Always great. Tremendous work with significant new contributions on top of the first video, you did it right!
I give great ideas for TH-cam content. Make an ignition coil tester, Simple tools such as relays and car batteries
Hyper cool d'avoir fait ça Victor !
Thank you for the inspiration. I wonder what would happen if you filled the tire with water?!?
Super channel !!
Try to build a tesla turbine with compressed air + power generator. Use speed reduction gear between.
It's really nice brother.
Please make an explained video on how to make the circuit to charge 12V battery through dc motor
Wow
My hero💗💗💗💗💗👍🏵️🏵️🏵️
Amazing
Super Vidéo ! Merci beaucoup à vous :)
Thanks for the video. Could you change gear ratios on the motor to generate more electricity?
As we said it's already optimized (cadence/torque ratio) ;)
I have a similar question regarding wheel size.. could a larger wheel turn the dynamo faster, therefore generating more power?
Bonne vidéo
Did you happen to calculate the efficiency of the motor?
New video? Yess!
You should use a BMS for the li-ion cells.
Would like to see test how much power you can give out in a day :D starting to build human powered powerplant :D
You meant how much energy!
@@DIYExperiments yes, electrical energy actually - would be kind of "fun fact" to calculate if it would be competitive and cheap .. should also calculate system setup and depreciation costs :) it would be totally different topic and new video ofc
@@Murunugis It's done in the video, it will be ridiculously expensive!
Great video!! I'm an amateur with a question: the larger the bike wheel is, the faster the dynamo will turn, therefore generating more power? Thanks
Mostly no. You’re limited by how much power the human body can produce. The larger wheel will turn faster but will be harder to turn. There’s probably a sweet spot, where the wheel is going fast but not too fast and where it’s not so hard to turn that you get tired fast.
@@TurboNuke Couldn't we just make a gear ratio to make pedaling easy and have like three tires and motors at the end? Just brainstorming. Maybe wind up mechanism with a series of pulleys connected to it to save some man power? Anything is possible even if it becomes a goldberg😆
I am not on Facebook so please tell me the generator you used? thanks, Bob in the UK
Are there certain motors that work well for this application?
Nice. Next time, take off the rear wheel, and connect the generator directly to the chain,
What model of generator do you use?
May I know what are the materials you used in the video and also the specs of that materials
According to the cycling machine at the gym i can generate 100 watts with effort, and i can keep doing that pretty long no problem
I was surprised at the comparison between human energy vs gas engine energy. Then I thought, there's 15-25% power loss between an engine and drivetrain of typical gas powered cars.
I compared the mechanical energy at the motor output (it can be a 95HP gasoline generator). The powertrain loss would be the same with any mechanical power source so it's not relevant. Same aspect if you compare the real energy efficiency of a car with idle time... The real gasoline to wheel efficiency of a car is something like 20% only (but again it's not the subject).
Here is an interesting thought. If you hook up a gym these kinds of set ups ... how much power would it generate? Would it be enough to power the place, the Lights and the AC etc?
oh i wish this question was answered... interesting thought indeed
Mains voltage in the US is 120V and a common breaker amperage is 20A. Meaning you can pull 2,400W. Or 24 cyclists running at 100W... which isn't hard to do. So yea its possible
I respect to everyone who were envolved in this. Seriously the best piece that I have ever seen on TH-cam. HATS OFF TO YOU ALL! LOVE YOUR VIDEOS!! ❣️😍😍..
Would it be even easier to pedal with a metal flywheel?
Hi thanks alot sharing this video .... I'm actually looking to build one too please recommend me a power generator... most i see online is for wind power or the electric scooter . (I'm looking for one that generate powers like your.) powers will storage into deep cycle battery please help me. Thanks
J'espère bientôt des nouvelles vidéos sur la chaîne incroyable expérience 😋🤗
Any good sources on TH-cam or otherwise to learn how this works?
Im completely new to anything electrical for example amps/restistors/watts/resistors or anything electrical but want to deepen my understanding
Electroboom (not actually a study channel) but check him out
@@yashvyas6410 thanks man
@@yashvyas6410 lmao. First vid I come across him
Blowing himself up using a homemade electric guitar... subbed.
4:04 So, 555 watts is the maximun reached on the first device, but only for a few seconds.
5:43 The maximum for 8-hour work is actually 125 watts. That is quite small compared to the rigorous work.
Primu
Could you please give me the specifications of the generator, brand and cost?
It's a generic DC motor, any 24-48V 250-500W motor can do the job :)
Many tks!!! Is it possible to get a new one in Amazon?
What is the name of generator?🤔
Is it available on Amazon?
What would happen if the stationary bike was a 21 speed and you were in the highest gear would you create more power then
No, the speed/torque ratio is already the best, it's very difficult to spin and a higher gear ratio would lead to less power
What type of DC motor did he used?
Legs are 5 times as strong as arms? Maybe in a short term scenario, but actually if you can pull out 100 Watts for 8hours with your legs, your arms can only do about 10watts for eight hours.
Greetings
This channel has been averaging one video a year for a while.
what type of generator is that? (not car alternator by the look of it....)
What DC generator is that?
Where is he all these months
Add multiple motors to the rear axle
Can you make a small motor lift 100 kg....please?🤗😅
How much energy human can provide by weight ???
So we cooked our food without any external energy sources ??
Since water required 4200 joules of energy per kg per degree of Kelvin
So for one kg water to become complete evaporation by making its boiling hot required how much energy ?
Found this thinking maybe human powered generator powering an EV bike, kind of like hydrogen cars(Toyota Murai)
u can use 3 phase bldc motor for better efficiency
Done in the video near the middle
which motor have you used. please reply
450W 36V MY style
WHAT IF = There was a 1 ton flywheel in place of the tire?
Bro please make a wishing rocket
Ou peut être les vrais auteurs mais j'aimerai tellement leur parler que ça soit IRL ou sur discorde par exemple
sir please make a vedio making a 1000000rmp brushless moter
Like Ending. Human power is no limit.🤔
Ha ha I've seen it all the BBC did a documentary on producing electrical power by simple equation total food energy multiply by the efficiency of the dynamo so about 20-25 percent simple. There are other factors friction and heat gets in away also so typical human 2500 watts by food multiply by 0.2 to 0.25 gives total power per hour .
4:40 The bicycle that you use in this part of the video has a flying wheel and that´s why you can produce more power. Here you have a link to a video which shows how to make a flying wheel using a bicycle wheel: th-cam.com/video/TBjuLDIjgkQ/w-d-xo.html
You´ll also find in this chanel other videos which explain how a flying wheel encreases the efficiency of a machine, and also hundreds of other interesting stuff !!!
God blesses you !!!
can i buy a complete tutorial from you please ?
c'est l'effondrement et je veux absolument créer ce système :(
2 years and no new video???
A horse power 746 Watts, a man power 555 Watts ha haha!
555W of electricity, but near 1000W of work possible! (not a long time while the horse can hold its horse power during hours ^^)
My bicycle makes 50 Watt with normal Pedal Craft Work.I Made with the circuit LT 1038 a regular DC Power🙌👍🗿➡️🙌😂😂😂🎯😯🐒
Do you steal this video from french Channel
What en anglais c'est vraiment vous la chaîne incroyable expérience ?
Oui c pour qu ils se fasse plus de thune au lieu de bosser sur de nouvelles vidéos
@@matheof2426 Alors ils font ça pour avoir une communauté plus grande, pour la thune ils ont un travail. Ils passent énormément de temps à étudier sur leur temps libre avant chaque vidéo. Ils font une vidéo pour chaque projet, ce qui prend de plus en plus de temps car chaque projet est plus ambitieux que le précédent, et ce n'est pas leur activité principale.
4:17 "according" is misspelled. Also, I find it suspicious that you never show the device working as you did with the third-party device at 4:35. You're a fraud, but this is still the best video on youtube about this subject, sadly.
what happened to this channel?, is everything ok?
Nice word
Excuse moi, vous etes Quebecois??
Wait, the resistor is futile when you put it in water because water makes a shortcut and bypassing the resistor!
It's a joke or you're serious? (before explaining)
@Joe Blow The resistor is something like 2 Ohm! The current is 14,5A thru it!
The current passing thru the water is around 0.01A! It's negligible (less than 1%).
"Water can shortcut a resistor", yes, but it depends on its value, for resistor less than 100 Ohms it's negligible.
And this video hims last video 😞
Last motor was destroyed
Or it was a brush motor. They do that.
You are still a live ?
Yes ?
Hello are you alive???
Nope!
Hi
Hello past me
Looks like I fell into rabbit hole of physical electric generator again
There is no rectifier so it is obviously a SCAM, SCAM, SCAM.
Новый источник энергии th-cam.com/video/LZ8Md-V-f9U/w-d-xo.html
Mumbo jumbo real life smurf account
We dont care Watt.. we care Watthour..
We talk about both, the vid is comprehensive
Did you die
Not enough time, but new vids will come
@@DIYExperiments ooh nice