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About trevmar

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  • Birthday 11/14/1948

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    several MiniPRO (modified), Airwheel S5

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  1. I haven't had any problems with either of my (large) Airwheel S5's. Keeping Lithium Ion batteries running with for long life with plenty of charge is difficult. I would think you need, at least, a digital voltmeter. Also, the battery packs on these small platforms are too small, and if you are running the unit near its capacity for more than a few seconds, the battery voltage will fall due to the load you are putting on it. Also, the batteries will heat up as time goes by. Both of these can send the unit into a low-voltage warning. Wait a minute or two until the batteries cool down again and they could well function normally until you push them too hard again. This is the reason I gave up on the smaller platforms and went for the S5, with its much larger battery capacity. Even then, if I ride for 5 minutes to the top of the hills above our house the battery drops until it has only one or two bars left (the S5 has a display on its handlebars so that I can see the battery level more conveniently). I have to let it cool by riding it less aggressively until the voltage builds back up to a more reasonable level.
  2. Thommy, most modern lithium-Ion cells do not age so quickly if the charge voltage is kept below 3.96 volts (approx, varies from cell to cell). The biggest increase in life is lowering the charge voltage from 4.2 to 4.1 volts, where the life doubles for many cells (from 500 to 1000 cycles for 20% degradation). Every manufacturer is different, but it is a good general rule to keep the voltage on any cell below 4.1V and preferably below 4.0V, which for a 16 cell pack is 64.0V. One complication is that the BMS often is not precise in balancing the charge into cells, and it is recommended to charge right up to 4.2volts every few cycles, say, once a week. This allows the BMS to balance out the charge in each cell if the cells in the pack are not exactly matched. Most BMS only balance the voltage at 4.2V. Hope that helps, and your choice of the Chinese platforms is a good one. I replaced my (four) Segway MiniPRO with two Airwheel S5, and have not had a single problem since then. I also bought a 2400W 'Halo Knight' in-line scooter, which is a real pleasure to ride!
  3. If you don't need the final 15% of battery longevity you can charge each cell to 4.0V only. That will reduce the self-discharge and increase battery life. Best to keep battery more than half-full, don't let it empty out as this reduces battery life.
  4. The Bluetooth on MiniPRO is strong enough to bring on headaches, affect balance, etc, which is why I modified the antennas on all four of my machines using the modifications I posted earlier in this thread. Apparently you can also cut the power to the bluetooth chip, I have not looked into doing that. The antenna mods are sufficient to take the level down to the Bioinitiative safety level.
  5. I used silver paste on my heatsinks. The failures were not due to hardware, but to software bugs (firmware bugs). As @WEagle95 told us, the interrupts re handled badly, there is no handler for bus error, and every so often it will just fail. Depending how heavy you are and the terrain you are driving it on. I have had no problems with my Airwheel S5 (touch wood). It is slower, but solid...
  6. @ABEhrhardt MiniPRO has no gears at all, and it cannot supply enough torque to safely handle all situations the MiniPRO finds itself in. Consequently many riders have been thrown and hurt. There are several discussions here on that topic. What caused me to give up on the MiniPRO was when it shut off while going down a steep hill, throwing me and badly dislocating my shoulder. The machine was definitely not being driven outside its parameters at the time, maybe a low battery was the problem? In any case it hurt me without warning, and so I have changed to using the Airwheel S5, which has worked really well (touch wood). I suspect the higher torque from the geared motor in the Airwheel S8 will give it enough margin to cope with any situation you place it in. Because of the extreme power and torque of my Airwheel S5+ (they are 1500W, designed for off-road with 19" wheels) I find that I no longer have to watch the road ahead for any obstacles under 2" or so, and this makes it really relaxing to ride... If I want to go faster I now have the folding electric bicycle (FIIDO D2).
  7. The miniPRO designers wrote a blog, which although in Chinese, translates well in Chrome or Google Translate. It is worth spending the time to read. The designers weight limit for the platform was 85Kg, and that was for the bigger battery pack. The higher limit came only from marketing folk. Take a look at the BLOG: http://bbs.ninebot.cn/forum.php?mod=viewthread&tid=4100&extra=page%3D1%26filter%3Dtypeid%26typeid%3D43 1/23 I weigh 90Kg, and have been thrown twice by the platform, which cuts off, apparently without cause. Both time my ligaments took months to recover (although my bones luckily remained intact). There is a thread talking about this design fault elsewhere on the forum.I don't use the miniPROs any more, I have 4 sitting in a corner of the garage...I now use the massive Airwheel S5+ (off-road) and a Fiido D2 electric bike when speed is preferred...
  8. While looking at eBikes I found that some are using the same sort of planetary gearbox internal to their wheel motors that the Airwheel S8 apparently uses. This overcomes the primary failure of the miniPRO, its inability to provide enough torque in emergency situations. eBikes which are fitted with these motors are rated to climb 30 degree slopes (eg Fiido D2) , while the standard motors are rated to 20 degrees.Yet the top speed does not seem to be affected much, it is obviously limited by law and battery power. issues. Here is a video showing how these motors work: And here is a diagram of the Airwheel R6 motor, showing its lower-ratio two-gear mechanism. This looks more like what they have in the drawing of their S8 motor:
  9. The S5+ I was sent has much bigger tyres, and, I think, a bigger motor, than the version they made in April 2019. The tires are now 130/70-12 Tubeless, which are the same as many scooters use. It does have a good off-road pattern: https://www.csttires.com/int/tire/cm502/ The outside tyre diameter is now just over 19" and they look nicely wide as well. Unfortunately it won't fit through our front-door like the earlier S5+ version. But the tyres look really business-like...
  10. @FreeRide, The only website who implied they had stock was https://flash-ecom.com Well, It turned out that they didn't have US stock, but they got the S5 to me in under a week, so I can't complain. To check that they were real I sent an email to the long.tan address on their webpage, and he sent me his phone number in China. I had previously bought Ebay stuff from long.jennie (apparently all part of the same marketing organization) so I was comfortable with dealing with them. I have been to Shenzhen half a dozen times, and have had no trouble with the businesses there... Well, the Flash website had discounted the $1600 down to $1420 (not sure why), but he asked for an extra $200 for air delivery, or told me he would have US stock in about 30 days by sea. Because I still thought the S5 had been discontinued I decided to pay for the airfreight, which was actually a good price for the 100lb item! It turned out that the handlebar stalk arrived by DHL in just 3 days, the heavier body by FedEx in 5 days (but the body had been through the 'flash' organization in Hawthorne/LosAngeles before being transhipped to FedEx). They said the body had to come via a slower freight service because the battery is 680Wh, over the 300Whour size limit for airfreight. So the body is marked manufacture date of 17th, and it was just delivered here on the 26th. Not bad... I am a happy camper... Now my wife and I each have an S5 and we need to get out and use them, rather than post here See ya! ps: Why did Airwheel send the handlebar stalk in a separate box?? The best suggestion I can come up with is that the lack of integrated handlebar might make the device look less like a Segway at Customs, and therefore be allowed through despite any possible patent violation issues... pps: The S5 weighs around 70lbs, but is easy to manhandle using the aluminum bars over the mudguards. The motor in each wheel is large and heavy, as are the 3.5" wide tires. The battery is 64 cells. Although the aluminum alloy body is strongly built, most of the weight is in the battery and wheels...
  11. I just received a mailer from More4mini advertising the availability of Swallowbot control boards and mainframes. Not sure whether these upgrades are authorized or not...
  12. A few months ago, realizing that the miniPRO was never going to have enough power to carry my weight while navigating obstacles (even tiny stones), I went looking for a similar device that had more power in its motors. I didn't want the gearbox-driven off-road Segway clones, both because they were too wide to fit through my front doorway, and because I like the silence and reliability of direct-drive motors (like in the miniPRO). I bought a device from Airwheel called the S5. It has 19" (OD) tires with 3" width and the motors are rated at least 1500Watts. Depending on what datasheet you look at, it is rated either at 100Kg or 130Kg capacity (so I assume you wouldn't want to go off-road with more than 100KG on board). It has a 680Wh battery with redundant BMS. The only problem was that it had been discontinued from production, so the one I bought was an orphan I have failed to find a second new unit until I saw a seller on the flash-ecom website. After calling his cellphone (it was in China) he told me he could get me a second S5 (for my wife), so I ordered one. The handlebar has just arrived by DHL from China, it has a manufacturing date of 17-Sept-2019 stamped on the box (8 days ago)! So it looks like Airwheel have just made another production run of these excellent PEVs! Additionally, the Canadian reseller seems to be taking orders for this new manufacturing batch. I guess they will pop up on Ebay in a few weeks (the boat trip from China is a little slower than DHL). The S5 (on the left below) are not fast, they are limited to 17Km/h and like to cruise at 12-15Km/h. But the ride is solid as a rock, and the display panel lets you know when you are stressing your battery hard (uphill). I still need to play with it more on off-road surfaces, but it is a much surer ride than the miniPRO (of course) and it is great to be able to relax and not have to worry about whether the next pothole is going to throw you. There is a 'twitchyness' in the steering, but much, much, less than with the miniPRO. So the S5 is proving to be exactly what I was looking for! It is the one on the left below... And now they seem to be making more of them
  13. Check with the airlines. The battery pack is smaller than the 300 Watt-hours limit, and is not removable. Non-removable batteries are supported in the regulations, and the airlines should allow it. It will have to go onboard with you though, I think, not in checked luggage.
  14. Best to find somebody to service it locally, I think. They are much the same as the MiniPRO. The S8 should be reliable, if you don't let it get too wet AND KEEP THE BATTERY CHARGED. There are videos on YouTube showing how to strip apart the various Airwheel models. They make repair a lot easier...
  15. Is the Airwheel S8 still being manufactured? That is a great question, FreeRide! Airwheel seems to be doing "production runs" of product. A few weeks ago I was told that the S5 was discontinued, yet one was shipped to me from the factory just a few days ago! The Canadian distributor's website implies that a special order of S5 is arriving there next month. However, most of the sellers have been winding down their US inventory since Airwheel-USA closed its doors. There also seems to be some confusion about whether the Segway-looking products can still be freely imported through US Customs. I know Segway was trying to get a blanket ban on them. My suspicion is that the S8 is still being manufactured. I really have little interest in it, for all the reasons you outlined in the safety post above. I have 4 miniPRO gathering dust around here at the moment, since they gave me the dislocated shoulder, and I am using the S5 for everything. Actually, that's not true. I went to the 1440 Multiuniversity conference center in Scotts Valley a week or two ago, and my wife and I threw two 320Wh miniPRO in the back of the car. But the hill up to our housing accommodation was far too steep for the miniPROs to manage, and even the main incline to the conference center was too steep for me to climb, although my wife did ascend that one OK... Now we know the failure mode (and triggers) of the miniPRO it is much easier to safely push them to their limits. I haven't found any power-limited situations with the S5 yet. Its huge motors, big wheels, and 680Wh battery seem sufficient at 15kmh speeds. Talking about motors. How did Airwheel fit a gear-train inside the wheel of the S8 (see image below)? Does it step up the torque or step down the torque? This is an innovation over the miniPRO (albeit a potential reliability and maintenance problem). Does anybody know how the 10" wheel and motor of the S8 actually work?
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