Gyroboards Impossible Energy Consumption

amps times volts = watts... there's no magic involved ....To calculate the watt hours (WH) of a battery pack, simply multiply the voltage by the amp hours (Ah) of the pack. A 48-volt 4.4-Ah battery pack has 211.2 watt hours . Each mile you travel will cost you a certain amount of watt hours. The range can vary widely depending on where and how you ride. A 700 watt motor doesn't use 700 watts all the time, that is merely the limit it can use....You might only use 20 watt hrs a mile...

You might gain efficiency by using a larger motor and running it at a more efficient 50% load than a smaller motor at 90% load....

Remember the battery pack doesn't fully discharge, so you aren't using the full capacity....and the battery pack has a maximum discharge rate, which you want to be below your motor wattage...

Nonsense.

Although the scooter motor may be rated 250W, it was only drawing 154W at the time it was assessed. 24V x 7Ah = 168Wh, so ignoring efficiency for the moment one might reasonably expect to sustain the load for around 168Wh / 154W = 65min. Say 50% efficiency and ¹/₂h might be reasonable.

In the case of the motor rated at 700W and drawing only 211W, 48V x 4.4Ah = 211Wh, so with similar calculation, and saying 50% efficiency, one might reasonably expect to sustain that particular load for a little over ¹/₂h on that particular battery bank as well.

The same load on the 2 different sized motors, one nearly 3 times as powerful, is not likely to be the same efficiency....

Please feel free to up-rev the back-of-the-envelope stuff in #3↑. One never stops learning in this world, especially on CR4.

My scooter is Razor E300. Let its brush DC motor be not the most efficient one. Well. But for it my own weght is not big. And although the ads for it had promised 40 min of continuous ride, actually, the charge lasts just for 25 min (with my little weight). But its ok, its reasonable - 168W batteries, 250W motor drawing all its nominal 250W.

But to promise for gyroboard 700W powerfull to last from 211W supply for 2 Hrs ! Then, its 700W motor should draw just about 100 W. What, the conventional scooter is 150 % less efficient than a gyroboard?! 10 %, 20%, 30 % numbers might for me be plausible, but not 150 %!!

What makes you think the second ad is any more accurate than the first??? I'm sure that the estimates are based on best case operational conditions, not real world, as you have discovered....but I think it's safe to say you might get bit better performance with the larger unit.... Why not just get some spare battery packs??

Might need a little customization to get these to fit....haha

For a while I considered throughing away the 7AH batteries and instead putting on deck of the scooter 45AH ones. But the weight of the machine would be monstrous so I just added another 7AH set, thus doubling the running range of it. It costed me very cheap. The option you refer to should be much more expensive.

At starts, at uphill movement, etc conditions the scooter (250W motor) should consume 500W. During the normal ride - 200W, carrying me. If I weighed 100kg, it would consume its all 250W. If I weighed 40kg - maybe 150W. Downhills its probably drawing now 100W. All is clear and fairly. The ads for the scooter were very near to the truth. But it seems to be other way with these "gyros-hovers".

700 W machine consuming 105 W of power ! Little short of Perpetuum Mobile ! The guiliness of people never stop wondering me.

PS One need to charge 2 sets of 7AH batteries on a scooter separately, as the original charger does not have enough power.

..."Most of these motors get 250W by using 36V (which we agree with, 24V is a waste of time), and they then limit the power with the controller capped at 8A (36V X 7A = 250W). Here’s a tip, you can raise the amps to 10A to get 360W, and I recommend adding a temp sensor to keep track of how hot the motor is getting. In that situation, you can raise the amps to 12A (36V X 12A = 420W), and as long as you don’t take it onto a long and steep uphill, it should only get warm. But…why not use TWO of them?"...

https://www.electricbike.com/250-watt-hub-motor/

http://visforvoltage.org/forum/general-community-discussions/1470

It would all add to the weight of my scoo, to costs too. It is sufficient for me as its now. My point was indignation with the gyro-hovers promotors ads telling ...lies, to say openly

I was just noting that increasing the voltage to 36v on your 24v motor for more power might be an option....not a suggestion, just a possibility....

It would appear you are confusing peak watts with continuous watt hour values.

Just because it can produce 700 watts of motor power does not mean that in normal average operating conditions it is using anywhere near that amount of energy. It may very well only be using 100 - 120 watts per hours which with a battery pack that has 200 - 240 watt hours of stored energy that easily matches the estimated run time.

It's no different that with your vehicle's rated fuel milage Vs actual working conditions.

In normal light driving where you are only using a fraction of the engine s capable power you will likely be close to the manufactures rated fuel milage number but say you are pulling a trailer while driving into a head wind and you're now running it at the upper end of its hp limits your fuel mileage numbers will be way worse than the average rating they gave it.

If you ran the gyroboard in flat smooth ground at lower speed it probably would run for 2 hours on a charge but if you are riding it flat out hard in rough ground then obviously its power consumption per unit of time will be way higher.

You follow?

These toys are not too speedy and on even smooth ground the temptation will always be to flat them out hard, as you put it, to the maximum speed. And the "flat out hard" means 700W + consumption and the soon disappointment of many, I am sure.

_{"My electric scooter with the motor 250W, using 154W power of 24V, 7Ah batteries supply runs me for about 1/2 an hour. Logically (isn't it ?) : 154W supply, 250W consumption}."

^{_{"But to promise for gyroboard 700W powerfull to last from 211W supply for 2 Hrs ! Then, its 700W motor should draw just about 100 W."}}

I'll just chime in on what the others are trying to pound into your head.

You are equivocating the RATING of the motor with the power CONSUMPTION of the motor. They are not the same thing. A motor RATED for 250W is just telling you that this is the maximum mechanical power output it CAN sustain without damage. The 152W is the ACTUAL electrical power it is consuming under the load you are giving it. You have done this exercise twice now, the second time even after it was pointed out. If you want to understand, let go of your false equivocation.

Power consumed is (mostly) related to the LOAD you apply to a motor, i.e. the WORK it must do. the only thing not related directly to the loading is the efficiency losses within the motor itself; heat, friction etc. So even if you have a 1000W motor, but the LOAD only needs 152W of power, the motor will draw 152W, plus a little more because the motor will have slightly more losses.

Of course - 250W is the power of the motor. Uphills, at rough starts it is consuming probably 1000W. On even ground, at full speed, with me on it (not an elephant), no wind in face, etc, should be about 250W.