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About hyiu00

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  1. I thought the IPS S5 already has a dual battery pack design, so if one battery pack is cutoff, the other battery pack can safetly bring the rider to a stop. But nobody can actually tell me if this is how it works.
  2. Yes, this is not a true redundancy design, but at least it is a step forward towards a more safe design. But what I really want to know is for other wheels, what happen during the transition from an old battery to a non-useable battery? Do most of you (1) just sell it to the second hand market to avoid this transition, or (2) just replace the battery every two or so years to avoid this situation, or (3) actually try to run it until something happens? What I am interested to know is for case 3, does it actually cause face plant or there is some measurable sign that can tell you the battery is not useable?
  3. I would tend to think the difference between continuous versus peak output power, and this goes for all the components including the battery, the BMS, and the motor. As long as any one side of this redundancy can deliver the peak power in a short time that is long enough to tilt the wheel and stop the rider, I will consider it to be safe enough. The peak power is normally related to temperature rise and it can be very high even for a small motor. The difference between the motor and the battery is that motor either works or fail completely, whereas battery degrade slowly. As long as the battery degrade slowly, this redundancy scheme should work since the electronics can detect the output current differential. Nonetheless, what I say in here is only my guess work. IPS advertised this redundancy but what they really need to do is to show how this redundancy actually works under different failure modes. Otherwise it will not be useful to anyone until there is an accident. I like the way IPS is going as they are trying to make wheels lighter and safer instead of more mileage and higher speed. Unfortunately, as of now, the bigger and more powerful ones are selling much better. I wish once the legal issues are worked out, IPS will gain back the shares.
  4. Thanks esaj for your detail explanation. Now I wonder if the IPS S5 with dual motor, dual BMS, and dual battery can improve the safety of EUC as the likelihood of both sides failing at the same time should be much much lower. Now I am wondering if anyone riding the IPS S5 have an actual situations or tests to show that this redundant design is really helping to improve safety.
  5. For most EUC rider that is no expert in battery, what happens when the battery level goes too low? Will a normal EUC warn the rider first or it will just fail and cause an accident? I can say that for new batteries, it should be safe, but my question is how about old batteries? Will old batteries cause accident without warning from the EUC when the battery level goes too low? If old batteries can cause accident, then there is still a big safety difference between a EUC and a E-scooter. The concern is that for most rider, there is no way to tell how old their batteries can be, before they become unsafe to ride. Can anyone give insight into what happen with old batteries as I do not have experience on?
  6. hyiu00

    The lightest EUC

    I have to say that the I5 is really suitable for crowded street like Hong Kong since it is designed for slow speed anyway. I usually ride it as slow as the walking speed of most pedestrian and it feels just like walking on a crowded street without bordering others. However, when the wheel was new, I had tried slowly riding up really steep hills in Hong Kong at my weight of 80kg and it can do hill climb better than my previous Inmotion V5D which tilted before reaching the top of the hill. This is why I really want to give a thumbs up on the I5 to be used in short distance, hilly, and crowded street just like in Hong Kong.
  7. hyiu00

    The lightest EUC

    Thanks for your reply. IPS comes out with the S5 after the I5, but S5 is too heavy for my taste. I just wish IPS can continue to make improvement on the lightweight EUC area. The I5 is really good for short distance travel when going to/from work from the Hong Kong MTR station. I believe the lightweight EUC area will pickup once the authorities work out the laws for personal electric vehicles. As for most people now, since it is not legal anyway, might as well buy the most powerful and highest speed wheel.
  8. hyiu00

    The lightest EUC

    I've been using the IPS I5 for two years already, and I really love its small size and light weight, while at the same time it can do reasonably stable ride on a normal pavement road. However, I do not see IPS coming up with newer products for this segment of the EUC, while other manufacturers continue to come out with bigger and more powerful and faster but heavier wheels. Even the Gotway Mtem3 has been out for over two years. I just want to give a thumbs up to IPS for making this great product and wish they can continue.
  9. hyiu00

    New i5 user experience

    I think the I5 shell is designed so that the left and right side is exactly the same. This will save their manufacturing cost so that they only need to make one side and can be clamp together to make the whole I5 case. You will see that the charging port hole on one side is the power button hole on the other side. This is why the power button is located there.
  10. They should add this button on the app. There are many cases that you want to turn on and off the lights while riding on it.
  11. Hello, It seems that the only way you can turn on / off the headlight is by swaying the unit left and right while it is in stop position. Mine is very sensitive and it is hard to control. It seems that is no way you can turn this function off frrom the app. It really scratches my head why is it design this way.
  12. For the same motor size and thus motor power, an advantage of lower speed is it will give more torque, which is a good thing for the heavier rider. I believe if the weight gets below 5kg, it will open up a large market where people will just carry them in their backpack when they are not riding it. So for Trey Lewis, he can keep 2 eucs, one for chasing rabbits in the forest while the other for easy riding in crowded streets. Eveyone wins.
  13. I just found that there are some battery research from several semiconductor companies. They are all proprietary, but it can give some insight into what is going on in the battery research. Unfortunately they are mainly target towards mobile phones and laptops. Texas Instruments Impedance Track™ Maxim Integrated ModelGauge™ STMicroelectronics OptimGauge™
  14. Well are there enough human guinea pigs test samples? If not, it is better to use modeling and run simulation with it, but the modeling and simulation must be convincing to everyone. I might not be using the right terms, but that is what I meant.
  15. If you assume the battery output resistance is linear then you might be right. Still no scientific proof of anything appeared. But I think the euc manufacturer now is just measuring the voltage only, not even the voltage drop (current) to infer the battery health.
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