Having read dozens of scientific articles on savonius, there is a use case for this kind of turbine (they are quite sturdy, and good at pumping water). But almost every video and product based on savonius is trash! You are basically the only one I found that understands that and explain it very well! To resume, the best savonius design is: 1. Enclosed top and botton with discs 10% wider than the diameter of the blades. 2. Rotor with Aspect Ratio of 5 (5 times as high as it's diameter). 3. Two bucket design with two rotors stacked in 90° angles, or 3 blades with higher aspect ratio to compensate (at least 6). 4. Instead of semicircular (half cylinder - like a C) blades, the blades should look like a 2 plane wings joined by their rear part (so it looks like a "S"). This way the rotor produce lift straight in the wind, but also, the returning blade throws the wind on advancing blade, reducing drag and improving "push". This is QUITE an improvement over the old "half cylinder" ones! 5. A decent savonius is able to reach about 200 rpm max, after that stronger winds only means more torque. They start with a gentle breeze! 6. If you overbuild them and their generators to withstand hurricane winds, they will outlive you. 7. Fit a sensor to be able to vary the load, so to draw huge power on high winds, but to reduce the load to avoid stalling at low winds. I wish every one to see this, so they smell the scams and make decent savonius turbines themselves!
sorry but this is useless. this kind of turbine is ineffective by design. what you do is like putting whiped cream on old donuts- sure it makes them more attractive but if you put this efford to better turbine ( 3 blade standard design) you'd have much better outcome
I have never seen a single post on youtube from someone with firsthand experience who can recommend a VAWT that is actually for sale. And that is all I need to know.
Hi, I am thinking of getting a good wind turbine. What can you please recommend? When it’s the rainy season I don’t get enough sunshine for my solar but there’s always good wind.
This sounds like a lot of "creative math" being used by the marketing teams for some of these turbines. There's one other thing you should do, before installing a turbine. Measure the DC resistance from leg to leg of the turbine generator. If you multiply that resistance by the output current, that will tell you how much voltage is lost to resistance. If you multiply the current by itself, then multiply by the DC resistance, you can determine how much energy is lost as heat in the circuit, and not making it to the battery! A turbine rated for 12 volts has to have 1/4 the resistance of a 24 volt turbine with the same wattage rating, to be equally efficient. If you see a 24 volt turbine promising 500 watts, a DC resistance of only 1 Ohm is going to dissipate 400 watts of heat, to reach the 20 amps necessary to produce 500 watts @ 25 volts. Under those conditions, the alternator is less than 56% efficient. The sad thing is, with small turbines, this would be more than acceptable.
Hi, thanks for your honest video, I especially appreciate the physics you touch on. it has improved my understanding of the subject. I am looking for a household wind turbine that can give me between 10-12 kwh daily all year round, so that I have approx. of 4100 kwh per year. I live in Copenhagen, Denmark, which is very urban, with an average wind speed of approx. 5 meters per second annually. My question to you is, can you recommend a household wind turbine that can give me what I'm looking for, and if not, can you recommend any alternatives?
Hello. Great video. Thanks for sharing your knowledge. I have an Ista Breeze 1500W 48V, and you are right. The blades are very bad, they only produce electricity with hurricane winds. Also the quality of the generator is very poor. I have disassembled it and it is sad to see the stator and the magnets. Very poor quality in general. It is difficult to choose a good wind turbine because sellers always exaggerate with the output generated. Could you advise which wind turbines are of good quality, and really produce? Thank you
yes I sold and produced wind turbines for 15 yrs and because of problems with blades suppliers(new eco friendly regulations in China) I had to quit but had competitor whos quality was good. I asked her for some promo for viewers. her adress is in new video
Thanks so much for your explanation and warning. I was thinking of pursuing a vertical turbine for home use. Are there any wind turbines you would recommend? Thank you again.
When the supplier doesn't gave a contact number then the alarm bells ring! Payments have been going through a Belgium account and some people have not received their orders.
yes. but I believe education system is to blame too. these turbines has no possibility to hit promised numbers. that's just physics. and still they selling it to the public
@4nrgyTech absolutely agree. The sausage machine of VAWTs designs just repeats itself as the next best thing. It's been done for decades and is a bit like flared trousers from the 70's, you know it will.come back into fashion but they still look silly.
I am by no means an expert on this subject, but I was wondering already why this was so good in numbers and you don't see them everywhere....which if they were THAT good..I would expect more people to do this....in theory wind + sun is a good combination. Usually when wind is there, we don't have sunlight and vice versa.
Thanks a lot for sharing your knoledge, really! Can you share or recommend me some summarized document for learning as much as possible about VAWT? I am planning to overcome the physical limit of 59% 🤓
only vawt which were ever considered is darrieus type. It was discarded after real life efficiency was 3-4times lower than standard wind turbines but if you want to do anything in vawt you can find a lot of research on darrieus type
Edit: 38mph wind gusts (20mph standard) is what you find today Jan 21th 2024, in London UK. Also listed as a yellow warning. Not every volume is the same shape. Different blades and funneling systems have different catch ability of the air volume. But it seems this company doesnt even provide the 7kw inveter with the package.
hello i have a hera7 wing turbine i have had it since july i took a video of it in a named storm and it did not move and tesup say it is my foult and not under warranty BUT IT LOOKS REALY NICE JUST DO,S NOT MAKE ANY POWER
That happened to me with the Ista Breeze people. I contacted them to tell them that the wind generator only produces in crazy winds, and they told me that it was my fault, that I did something wrong. No warranty. 😂
do you know how mutch Nm torque the tesup dynamo needs? i want to mount it to a ''bottle wheel'' with chain and sprockets (sorry for my bad english, im dutch and use some google translate)
no. sorry but I don't believe in their products. this is small generator but should have more than 2Nm also ppl reported bad bearings quality so check this before. there are cheap pmg generators on the market with real power and price is 100-200$. if you can make 300rpm on generator side you can try with tesup and after it dies(it will ) you cqn buy 100$ 1kw generator from alibaba or aliexpress
you do not use blade area - we just need amount of air to calculate energy which means front surface of propeller times speed of the wind this gives us volume of air which is avalable for the turbine
Hello, you just saved me 2200 dollars. I already have a solar panel system, that could be complemented with wind energy. If I could generate 500w of electricity the whole night, my battery needs would be greatly diminished. what do you recommend?
5kWh battery costs abt 1000$ worldwide soit would be hard to install even 2kw wind turbine within this budget. but if you decide for wind : 2kw turbine would be my recommendation. price is from 500 up to 2000$
I don't want the WHOLE turbine; just a VAWT Savonius blade set! I've got an alternator that is great at low speed but I need a decent blade set. I could do the half-barrel thing but there are better options.
Also if it was 7kw they deliver a inverter with the 7kw only 1 problem the inverter is a 2-3kw inverter? But also those inverters has channels 1 1.5kw I wanted an explanation I never got it. I have a 2kw atlas and it turnes only 1 coil isn't doing anything AMD the rotor is damaged broken magnets also 1 longer Magnet sticking out. The device delivered with the atlas went out with a big bang and lots of smoke also it was produced in Turky . I wanted to install lots on rooftops so I asked a 7kw showmodel to let people see it works I didn't get 1. Also I asked for a solution for the 7kw to grid. I didn't get one. But one thing the atlas 2.0 turns and produces power with the 2kw turbine. But it's with 1 coil less. And yes the support is bad it's a pitty because its a beautiful product. I wanted to take over the support in my country but I didn't get any answer. As I would say the 2kw version works. 7kw it would be a Bit heavy.
*All practical tests show that small wind turbines hardly generate any electricity.* Because there is hardly any wind close to the ground - and electricity yield is proportional to the third power of the wind speed: 100% more wind generates 800% more electricity! Only if you need to be self-sufficient from the power grid, you should install the largest possible wind turbine on a high mast. *With solar modules, on the other hand, you can reliably generate green electricity for 25 years at approx. 3-10 cent/kWh!*
I have 3000 kv Tesup wind tribune...I can say that it does not produce electricity in the very windy area...I am not happy with it really...sorry I do not beleive so like talking..
Checking their "Book" I found the chart, the 7kWh are reached at 51m/s wind!!!!!!! Which is 180km/h standard wind which everyone has of course. They might not be lying, but they just cleverly used a 180km/h wind as their standard. The whole website etc is incredibly well made. So this is how they just market something beyond what is true.
but even this is not true. they just calculated wind energy at this speed and multiplied it by some made up efficiency. problem is with savonius turbines turbulences are so significant that above 16-17m/s efficiency goes to zero. Ask anyone who build this kind of turbine. on hurricanes this doesnt produce any energy( bonus- also falls apart, mine did)
@@4nrgyTech Okay wow I didn't even know that. Then it's really close to a scam A-Z. It's incredible how they put so much effort into a great website and design and just only deliver a few % of what they promise. Think people could probably sue them if they still exist in a few months. I would want to hire the guy who builds their websites and writes their texts though bc. they are exeptionally well made imo.
Yes they are. Sorry for your experience. If you are from uk try to contact authorities. This scam goes way too long and too many ppl lost their money and trust in wind power too
Your calculations are just theoretical! If you really want to denigrate this product, then buy it and carry out your tests with it....! This will allow you to be truly credible! You are no more credible than their advertising, sorry..!
well. that's not channel for you. mathematics is powerful tool. engineering is applying mathematics to real world situations. you can lick every dog excrement on the street just to practically assess whether it is chocolate bar or not. or you can apply probability and game theory and leave it. since applying mental processes is too theoretical for you I can only feel sad over the fate of the people you kiss afterwards😏
Hi, thanks for your honest video, I especially appreciate the physics you touch on. it has improved my understanding of the subject. I am looking for a household wind turbine that can give me between 10-12 kwh daily all year round, so that I have approx. of 4100 kwh per year. I live in Copenhagen, Denmark, which is very urban, with an average wind speed of approx. 5 meters per second annually. My question to you is, can you recommend a household wind turbine that can give me what I'm looking for, and if not, can you recommend any alternatives?
![[Live] : ONE 167 วันนี้!! "ตะวันฉาย vs โจ"](http://i.ytimg.com/vi/D9_dvfIa6Ao/mqdefault.jpg)
Thanks for helping people understand this topic - did my mechanical engineering thesis on windpower in 1981
Thank you love your math explanation.
Having read dozens of scientific articles on savonius, there is a use case for this kind of turbine (they are quite sturdy, and good at pumping water). But almost every video and product based on savonius is trash! You are basically the only one I found that understands that and explain it very well! To resume, the best savonius design is:
1. Enclosed top and botton with discs 10% wider than the diameter of the blades.
2. Rotor with Aspect Ratio of 5 (5 times as high as it's diameter).
3. Two bucket design with two rotors stacked in 90° angles, or 3 blades with higher aspect ratio to compensate (at least 6).
4. Instead of semicircular (half cylinder - like a C) blades, the blades should look like a 2 plane wings joined by their rear part (so it looks like a "S"). This way the rotor produce lift straight in the wind, but also, the returning blade throws the wind on advancing blade, reducing drag and improving "push". This is QUITE an improvement over the old "half cylinder" ones!
5. A decent savonius is able to reach about 200 rpm max, after that stronger winds only means more torque. They start with a gentle breeze!
6. If you overbuild them and their generators to withstand hurricane winds, they will outlive you.
7. Fit a sensor to be able to vary the load, so to draw huge power on high winds, but to reduce the load to avoid stalling at low winds.
I wish every one to see this, so they smell the scams and make decent savonius turbines themselves!
sorry but this is useless. this kind of turbine is ineffective by design. what you do is like putting whiped cream on old donuts- sure it makes them more attractive but if you put this efford to better turbine ( 3 blade standard design) you'd have much better outcome
I have never seen a single post on youtube from someone with firsthand experience who can recommend a VAWT that is actually for sale. And that is all I need to know.
Thanks! Greetings from Ukraine!
THX for explaining 🙂
Many thanks for this enlightening Video. What would you suggest.
Already made video. 3,2m diameter 2kw(3kw real power)
Hi, I am thinking of getting a good wind turbine. What can you please recommend? When it’s the rainy season I don’t get enough sunshine for my solar but there’s always good wind.
This sounds like a lot of "creative math" being used by the marketing teams for some of these turbines. There's one other thing you should do, before installing a turbine. Measure the DC resistance from leg to leg of the turbine generator. If you multiply that resistance by the output current, that will tell you how much voltage is lost to resistance. If you multiply the current by itself, then multiply by the DC resistance, you can determine how much energy is lost as heat in the circuit, and not making it to the battery! A turbine rated for 12 volts has to have 1/4 the resistance of a 24 volt turbine with the same wattage rating, to be equally efficient. If you see a 24 volt turbine promising 500 watts, a DC resistance of only 1 Ohm is going to dissipate 400 watts of heat, to reach the 20 amps necessary to produce 500 watts @ 25 volts. Under those conditions, the alternator is less than 56% efficient. The sad thing is, with small turbines, this would be more than acceptable.
A great video. Thanks for the share a calculations.
These are only theoretical calculations...! It is no more credible than their advertising.
Let this wind turbine company get it certified by reputed third party for 7 kw rating and generation for different wind speeds.
Que costo tiene todo el equipo con el conversor y todos los equipos que necesite? No solo la turbina
Hi, thanks for your honest video, I especially appreciate the physics you touch on. it has improved my understanding of the subject.
I am looking for a household wind turbine that can give me between 10-12 kwh daily all year round, so that I have approx. of 4100 kwh per year.
I live in Copenhagen, Denmark, which is very urban, with an average wind speed of approx. 5 meters per second annually.
My question to you is, can you recommend a household wind turbine that can give me what I'm looking for, and if not, can you recommend any alternatives?
this had to be 3-4kw wind turbine which means 3,2-4m diameter. do you have possibility to make on grid system? or this have to be with batteries?
Hello. Great video. Thanks for sharing your knowledge. I have an Ista Breeze 1500W 48V, and you are right. The blades are very bad, they only produce electricity with hurricane winds. Also the quality of the generator is very poor. I have disassembled it and it is sad to see the stator and the magnets. Very poor quality in general.
It is difficult to choose a good wind turbine because sellers always exaggerate with the output generated.
Could you advise which wind turbines are of good quality, and really produce?
Thank you
yes I sold and produced wind turbines for 15 yrs and because of problems with blades suppliers(new eco friendly regulations in China) I had to quit but had competitor whos quality was good. I asked her for some promo for viewers. her adress is in new video
Have you tried Yelmotor MX?
Thanks so much for your explanation and warning. I was thinking of pursuing a vertical turbine for home use. Are there any wind turbines you would recommend? Thank you again.
do not. rly look at commercial energy generation. where money counts. do you see VAWT there? no you dont. they do not work
When the supplier doesn't gave a contact number then the alarm bells ring! Payments have been going through a Belgium account and some people have not received their orders.
yes. but I believe education system is to blame too. these turbines has no possibility to hit promised numbers. that's just physics. and still they selling it to the public
@4nrgyTech absolutely agree. The sausage machine of VAWTs designs just repeats itself as the next best thing. It's been done for decades and is a bit like flared trousers from the 70's, you know it will.come back into fashion but they still look silly.
I am by no means an expert on this subject, but I was wondering already why this was so good in numbers and you don't see them everywhere....which if they were THAT good..I would expect more people to do this....in theory wind + sun is a good combination. Usually when wind is there, we don't have sunlight and vice versa.
thanks mate numbers are the truth advertisment needs believers
Question: .36m per blade.. but 7 blades? Doesn’t that make just over 2.5 sq meters?
Thanks a lot for sharing your knoledge, really! Can you share or recommend me some summarized document for learning as much as possible about VAWT? I am planning to overcome the physical limit of 59% 🤓
only vawt which were ever considered is darrieus type. It was discarded after real life efficiency was 3-4times lower than standard wind turbines but if you want to do anything in vawt you can find a lot of research on darrieus type
Edit: 38mph wind gusts (20mph standard) is what you find today Jan 21th 2024, in London UK. Also listed as a yellow warning.
Not every volume is the same shape. Different blades and funneling systems have different catch ability of the air volume. But it seems this company doesnt even provide the 7kw inveter with the package.
after first 20secs I looked at your name and thought it's called "4ngry Tech" aka Angry Tech haha thoght cool name!
very nice video , thanks, but which wind turbine I could afford for 1000€ and have invest return of 5 year ?
Check new video! Thank you for this subject😁
@@4nrgyTech
Ah Ah Ah...! Or how not to answer a question like a politician. But try to get views on your channel...! CHARLOT.
Thanks for explaining in detail.
hello i have a hera7 wing turbine i have had it since july i took a video of it in a named storm and it did not move and tesup say it is my foult and not under warranty BUT IT LOOKS REALY NICE JUST DO,S NOT MAKE ANY POWER
That happened to me with the Ista Breeze people. I contacted them to tell them that the wind generator only produces in crazy winds, and they told me that it was my fault, that I did something wrong. No warranty. 😂
So sad.😢 But you have warranty right? Ask for your many back!
Thanks very much for this - really helpful and well explained!
Glad it was helpful! It's sooo many pseudoscience abt wind turbines it's even scary
do you know how mutch Nm torque the tesup dynamo needs? i want to mount it to a ''bottle wheel'' with chain and sprockets (sorry for my bad english, im dutch and use some google translate)
no. sorry but I don't believe in their products. this is small generator but should have more than 2Nm also ppl reported bad bearings quality so check this before. there are cheap pmg generators on the market with real power and price is 100-200$.
if you can make 300rpm on generator side you can try with tesup and after it dies(it will ) you cqn buy 100$ 1kw generator from alibaba or aliexpress
Thank you. I am confused that you calculate just one blade (or two) but not all the blades. Why?
you do not use blade area - we just need amount of air to calculate energy which means front surface of propeller times speed of the wind this gives us volume of air which is avalable for the turbine
@@4nrgyTech thank you
@@4nrgyTech is there at the moment any horizontal WIND TURBINE you can recommend?
depends on power and type of installation topology( grid tie or off grid)
Can you please recommend any wind turbines off grid for residential purposes for me.
Good info. Thanks.
Glad it was helpful!
Just theoretical information, nothing else.
Hello, you just saved me 2200 dollars. I already have a solar panel system, that could be complemented with wind energy. If I could generate 500w of electricity the whole night, my battery needs would be greatly diminished. what do you recommend?
5kWh battery costs abt 1000$ worldwide soit would be hard to install even 2kw wind turbine within this budget. but if you decide for wind : 2kw turbine would be my recommendation. price is from 500 up to 2000$
I don't want the WHOLE turbine; just a VAWT Savonius blade set! I've got an alternator that is great at low speed but I need a decent blade set.
I could do the half-barrel thing but there are better options.
HE-MAN
Minä ostin kaksi tesuppia. Kumpikaan ei ole pyörähtänyt kertaakaan. Kovia tuulia ollut. Ovat olleet minulla noin puoli vuotta. Varokaa huijareita.
So where is the next video....
Here it is😁
Also if it was 7kw they deliver a inverter with the 7kw only 1 problem the inverter is a 2-3kw inverter? But also those inverters has channels 1 1.5kw I wanted an explanation I never got it.
I have a 2kw atlas and it turnes only 1 coil isn't doing anything AMD the rotor is damaged broken magnets also 1 longer Magnet sticking out. The device delivered with the atlas went out with a big bang and lots of smoke also it was produced in Turky . I wanted to install lots on rooftops so I asked a 7kw showmodel to let people see it works I didn't get 1. Also I asked for a solution for the 7kw to grid. I didn't get one. But one thing the atlas 2.0 turns and produces power with the 2kw turbine. But it's with 1 coil less. And yes the support is bad it's a pitty because its a beautiful product. I wanted to take over the support in my country but I didn't get any answer. As I would say the 2kw version works. 7kw it would be a Bit heavy.
*All practical tests show that small wind turbines hardly generate any electricity.* Because there is hardly any wind close to the ground - and electricity yield is proportional to the third power of the wind speed: 100% more wind generates 800% more electricity!
Only if you need to be self-sufficient from the power grid, you should install the largest possible wind turbine on a high mast.
*With solar modules, on the other hand, you can reliably generate green electricity for 25 years at approx. 3-10 cent/kWh!*
sorry why did you delete my comment?
I didn't. If you put links youtube is deleting it automatically. Otherwise I don't know
Today is June 8th, ordered and paid on Feb. 3rd. 2024, nothing, wont even answer my tickets. DO NOT ORDER FROM THESE PEOPLE!!!
I have 3000 kv Tesup wind tribune...I can say that it does not produce electricity in the very windy area...I am not happy with it really...sorry I do not beleive so like talking..
yup. these are scam. that's what im trying to explain
Checking their "Book" I found the chart, the 7kWh are reached at 51m/s wind!!!!!!! Which is 180km/h standard wind which everyone has of course. They might not be lying, but they just cleverly used a 180km/h wind as their standard. The whole website etc is incredibly well made. So this is how they just market something beyond what is true.
but even this is not true. they just calculated wind energy at this speed and multiplied it by some made up efficiency. problem is with savonius turbines turbulences are so significant that above 16-17m/s efficiency goes to zero. Ask anyone who build this kind of turbine. on hurricanes this doesnt produce any energy( bonus- also falls apart, mine did)
@@4nrgyTech Okay wow I didn't even know that. Then it's really close to a scam A-Z. It's incredible how they put so much effort into a great website and design and just only deliver a few % of what they promise. Think people could probably sue them if they still exist in a few months. I would want to hire the guy who builds their websites and writes their texts though bc. they are exeptionally well made imo.
This company has a TERRIBLE online reputation. Nothing but extremely negative reviews.
scammers?
it looks like it
have one and hasnt worked at all..... just turns into the wind. A piece of sh***
Yes they are. Sorry for your experience. If you are from uk try to contact authorities. This scam goes way too long and too many ppl lost their money and trust in wind power too
Your calculations are just theoretical! If you really want to denigrate this product, then buy it and carry out your tests with it....! This will allow you to be truly credible! You are no more credible than their advertising, sorry..!
well. that's not channel for you. mathematics is powerful tool. engineering is applying mathematics to real world situations. you can lick every dog excrement on the street just to practically assess whether it is chocolate bar or not. or you can apply probability and game theory and leave it. since applying mental processes is too theoretical for you I can only feel sad over the fate of the people you kiss afterwards😏
SEG MUCH BETTER 😂 . 4KW/H
Hi, thanks for your honest video, I especially appreciate the physics you touch on. it has improved my understanding of the subject.
I am looking for a household wind turbine that can give me between 10-12 kwh daily all year round, so that I have approx. of 4100 kwh per year.
I live in Copenhagen, Denmark, which is very urban, with an average wind speed of approx. 5 meters per second annually.
My question to you is, can you recommend a household wind turbine that can give me what I'm looking for, and if not, can you recommend any alternatives?
2-4kW which is 3-4m diameter