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Portable Charger for EUC batteries with a Turbine or Pedal


Kudays
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Hi Guys,

Do you know if there are any portable chargers for EUC batteries with a Turbine or Pedal ? There are already portable chargers for mobile phones. I think it would be a great solution in emergency cases. 

Here is one example for mobile phones: 

 

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29 minutes ago, Kudays said:

Hi Guys,

Do you know if there are any portable chargers for EUC batteries with a Turbine or Pedal ? There are already portable chargers for mobile phones. I think it would be a great solution in emergency cases. 

Here is one example for mobile phones: 

 

For mobile phones one just need energy in the range of 3wh (to fully charge them). For a unicycle this is about nothing...

Just for a rough idea of the requirements: the motor in the euc is  (like every e motor) also a generator. To get energy from it to drive again, one has to put (a bit more) mechanical energy "into" it than one want to use afterwards.

Also one could make a generator more efficient (gearbox, rpm) and smaller (euc does not need to be fully recharged), but still would be not really portable.

So better to plan a stop for longer tours and recharge with the normal charger.

 

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3 hours ago, Kudays said:

Do you know if there are any portable chargers for EUC batteries with a Turbine or Pedal ?

I did have to giggle at this question, if you want to wind a handle to charge up the battery why not cut out the middle man - and all the associated efficiency losses and just use a bicycle, if you run out of energy on one of them you just need a snickers or mars bar to top up again! 

3 hours ago, Chriull said:

Just for a rough idea of the requirements: the motor in the euc is  (like every e motor) also a generator.

To put this into perspective, a very good cyclist can probably sustain about 250W http://mapawatt.com/2009/07/19/bicycle-power-how-many-watts-can-you-produce . Turning that into electrical power is likely to be (say)80% efficient so generating around 200W. Hence to recharge a 400Wh battery is going to take at least two hours of VERY strenuous peddling. Not to mention the weight of the equipment you would have to carry to do it. As @Chriull says, the EUC motor is a generator so you could possibly add gears and peddles to that motor and spin it up to charge but I doubt very much that regenerative braking would have anything close to 80% efficiency or even half that figure.

pretty much a non-starter really.

 

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19 hours ago, Keith said:

 

I did have to giggle at this question, if you want to wind a handle to charge up the battery why not cut out the middle man - and all the associated efficiency losses and just use a bicycle, if you run out of energy on one of them you just need a snickers or mars bar to top up again! 

To put this into perspective, a very good cyclist can probably sustain about 250W http://mapawatt.com/2009/07/19/bicycle-power-how-many-watts-can-you-produce . Turning that into electrical power is likely to be (say)80% efficient so generating around 200W. Hence to recharge a 400Wh battery is going to take at least two hours of VERY strenuous peddling. Not to mention the weight of the equipment you would have to carry to do it. As @Chriull says, the EUC motor is a generator so you could possibly add gears and peddles to that motor and spin it up to charge but I doubt very much that regenerative braking would have anything close to 80% efficiency or even half that figure.

pretty much a non-starter really.

 

 

I cannot just use a bicycle, because it is not portable. Imagine that you realised that your EUC ran out of charge, just in the middle of an off-road tour. Thinking that you can go about 30 - 40 km far away from the starting point, it is not a distance to walk back carrying your EUC in your hand. 

250 W power is quite enough to use in emergency situations. Not only for EUC! Imagine that you are using an electrical engine for your boat and ran out of charge in the middle of ocean. You must have a powerful mechanical recharger system to use in emergency situations. I thought it is already needed and produced by some companies.    

     

Edited by Kudays
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20 minutes ago, Kudays said:

250 W power is quite enough to use in emergency situations. Not only for EUC! Imagine that you are using an electrical engine for your boat and ran out of charge in the middle of ocean. You must have a powerful mechanical recharger system to use in emergency situations. I thought it is already needed and produced by some companies.    

This charger in your Video is able to Charge about a 3-4000mah cell....Our Ewheels hold about from 15 - 130 of this cells. Lets say in middle 60cells.

So just think about "turning" 60 of this diy charges at the same time :rolleyes:

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Well, as many above mentioned motor also acts as a generator. It only takes to find some long slope, walk it up and ride it down (probably several times), or at worst on your way help the EUC uphill by kick riding (slowly) while braking and brake downhill to regenerate energy in the battery. It should help for the last solution without battery and make sure you charge it normally ASAP

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If recharging via pedaling is desired, it seems like the best way to go would be to get an electric bicycle with regenerative ability. As others have noted, a setup with an EUC will require a bunch of extra external equipment that isn't portable. With an electric bike you get all the equipment in an integrated package that's easy to take with you.

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Maybe get a couple of the hand generators and two of the pedal ones to put them all in parallel to pump out some serious wattage!  :w00t2:  I can just imagine the looks as people see you and your riding friend hand cranking and pedaling to charge up your rides over 5 hours of cranking!

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15 hours ago, Hunka Hunka Burning Love said:

Maybe get a couple of the hand generators and two of the pedal ones to put them all in parallel to pump out some serious wattage!  :w00t2:  I can just imagine the looks as people see you and your riding friend hand cranking and pedaling to charge up your rides over 5 hours of cranking!

 

On 3 December 2017 at 4:13 PM, Keith said:

Let us be REALLY generous and  assume absolutely 100% efficiency in your charge circuit and that this device plus some sort of charging  converter generates a high enough voltage to actually charge your EUC. Then after peddling the device for one whole hour (just like the wife in @Hunka Hunka Burning Love‘ video) you will get exactly 1 mile of range out of your EUC.

Thanks, i got my answer to the question. I guess portable pedal power generator is a very new prototype. I expect they will make a more powerful product. So that we can charge our EUCs in a very near future.

 

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I wonder if that cycle generator that he was riding had a gearing system like on a 10 or 21 speed bike whether that would have made it easier for him to produce power for a longer amount of time.  Maybe add on a heavy fly wheel too?  Sort of like climbing a really steep hill if you have it in the wrong gear it will be a bear to climb, but gear it down a bit, and it's manageable with lighter forces on the pedals.

With all these Tesla Supercharger stations popping up, it would be cool if someone could create an adapter to connect to the Supercharger port and convert it to allow us to charge our EUCs.

Edited by Hunka Hunka Burning Love
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5 minutes ago, Hunka Hunka Burning Love said:

I wonder if that cycle generator that he was riding had a gearing system like on a 10 or 21 speed bike whether that would have made it easier for him to produce power for a longer amount of time. 

Looking at https://en.m.wikipedia.org/wiki/Human_power it seems that he was already at some quite efficient gear ratio.

5 minutes ago, Hunka Hunka Burning Love said:

Maybe add on a heavy fly wheel too? 

A fly wheel should just average peaks, or be "feed" over hours with energy to release it in short time - anyhow it won't help as it does not produce energy - it just can "store" it.

5 minutes ago, Hunka Hunka Burning Love said:

With all these Tesla Supercharger stations popping up, it would be cool if someone could create an adapter to connect to the Supercharger port and convert it to allow us to charge our EUCs.

Yeah! Charge the euc to 100% in a second ?

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15 hours ago, Chriull said:

Ps.: @kudays, your "wrong" thought is to hope for "a more powerful product", but a generator is just transforming power. So one would need more powerfull human beeings..

No i am not wrong. In the video you have sent, Robert forced the finish the task in minutes! That's the problem. So that's why he has to use his full energy = 700 Watt. So the calculation: 700 W x 2 minute = 700 W x 0,033 h = 23,3 Wh energy. One can easily pedal for 1 hour if driving parts have frictionless just as in the video below

  

This man can produce 300 Wh energy in 1 hour pedalling that i think enough to charge a EUC battery. But i need something portable so i will buy a  K-tor powerbox (20 W pedal generator) and pray to find more people around to help me pedalling in an emergency. :)

Edited by Kudays
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40 minutes ago, Kudays said:

No i am not wrong. In the video you have sent, Robert forced the finish the task in minutes! That's the problem. So that's why he has to use his full energy = 700 Watt. So the calculation: 700 W x 2 minute = 700 W x 0,033 h = 23,3 Wh energy. One can easily pedal for 1 hour if driving parts have frictionless just as in the video below

  

This man can produce 300 Wh energy in 1 hour pedalling that i think enough to charge a EUC battery. 

He _stated_ that he _could_ produce 300Wh if he _would_ ride for one hour!

According to the link https://en.m.wikipedia.org/wiki/Human_power of my previous post he would by this almost perform like a well trained cyclist during a one hour race! But he stated while riding he feels comfortable. Like riding up a moderate hill!

"During a bicycle race, a well trained cyclist can produce / sustain close to 400 watts of mechanical power over an hour and in very short bursts over double that: 1000 to 1100 watts (modern racing cycles have greater than 95% mechanical efficiency). An adult of good fitness is more likely to average between 50 and 150 watts for an hour of vigorous exercise."

So between 50 to 150 Wh are possible for an adult of good fitness!

There is _no_ way to get more than this 50 to 150Wh per hour into the battery as an adult of good fitness. No matter how frictionless, powerfull or whatever the generator is!

Ok one way is possible - take a break and invest another hour, and than another hour... or train like a professional cyclist and one can deliver about 400Wh...

One could use this 50 to 150Wh better and more efficient to walk/carry/trolly his euc for an hour...

... Or take a 3-400Wh spare battery pack, a dc to constant current converter and recharge the wheel for an hour taking a break...

Quote

i need something portable so i will buy a  K-tor powerbox  or) and pray to find more people around to help me pedalling in an emergency. :)

So it takes an hour to produce 20Wh...

Since driving this generator did not seem exhausting (and 20W also should not) you'd need no more people but very very much time...

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  • 5 weeks later...

To quickly recap: let's say you need to travel 10km. For this you need to charge the EUC at the very least 100Wh, which requires at the very least 1 hour of pedaling (given that suitable equipment is available). Plus 1/2 hour for driving 10km (probably longer though, because fast driving requires more Wh). That means even in the most optimistic scenario you can only save 25% of travel time compared to walking 10km in 2h.

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  • 1 month later...

I have a portable pedal generator. It’s called a Power Box by KTor. It maxes out at 20w at 120v DC.  It folds to fit in a backpack and it’s great for charging multiple phones on camping trips but it would be useless for charging an EUC.  

I also converted an electric mountain bike into a pedal generator.  I could sustain an output of 80 watts but it was hard work.  To charge my EUC I need 125 watts for a couple of hours. Imagine pedalling as hard as you can, breaking a huge sweat, exhausting your body for 30 minutes to put 30 minutes of ride time back into your EUC.  And carrying the large, heavy, bulky generator in a huge backpack.  It would make more sense just to walk.  A small folding kick scooter would be less bulky and heavy than an EUC and powerful pedal generator.  And it would be less work.  It is just not possible for a human to charge an EUC by pedal power in a way that makes it useful.  

There is no new pedal generator about to hit the market that will let a human produce say 200 watts comfortably for long enough to charge an EUC.  We are limited by the amount of kinetic energy we can produce with our limbs.  The laws of physics are not on your side with this. 

Why not just carry a portable power pack?  I ride with enough extra power in my backpack to triple my range.  And it takes up no more space than a small laptop.

Edited by RooMiniPro
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3 hours ago, KalSeth said:

Not to hijack the thread but slightly related.  I wonder if an old unicycle could be repurposed to be a turbine for a micro hydro installation

Yes. Should work out. Just nothing is waterproof!

And maybe one has to look to reach some range of rotational speed to get some efficiency.

Also care should be taken that the LiIon's are not overcharged (too high current by too high speeds of the "turbine") and overvoltage protection is by BMS shutoff at some voltage a bit above 4,2V, so not optimal for battery lifetime. Cell balancing of the BMS could be insufficient, too.

 

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