Gaz Bon Posted November 16, 2019 Share Posted November 16, 2019 (edited) 22 minutes ago, Aneta said: Li-po pouches will need to have enough space reserved (=wasted) for their famous "pop": - that it will kill their energy density advantage. Also, it's much more significant fire hazard than hard-shell Li-ions.18650s, etc. have a valve under positive contact that breaks the circuit and releases gases, should the internal pressure increase. So Aneta I'm guessing of the 3 options that come to mind you are 1 A Google search engine zen master 2 An electrical engineer 3 Have a photographic memory Either way you seem to have a depth of knowledge and a Lov of Math 😎 Edited November 16, 2019 by Gaz Bon Quote Link to comment Share on other sites More sharing options...
atdlzpae Posted November 16, 2019 Share Posted November 16, 2019 25 minutes ago, Aneta said: Li-po pouches will need to have enough space reserved (=wasted) for their famous "pop" You're right. I totally forgot about this "feature". I guess that we still have to wait for rechargeable fuel cells or smth... But that's obviously > 20 years away. Quote Link to comment Share on other sites More sharing options...
mrelwood Posted November 16, 2019 Share Posted November 16, 2019 8 hours ago, AtlasP said: No because the individual cells are bigger. The energy density remains the same (energy per mass). The overall weight should remain the same. Energy per internal mass is likely the same, but I would think three complete 18650 cells weigh more than two 21700s due to the amount of casings. No idea how much difference though. 7 hours ago, ZenRyder said: Um, that's not good. If you are pushing the EUC there are already issues with heat and from my understanding that little computer fan blowing over the mosfet doesn't do enough. If you have a lot of heat coming from the battery pack, that will just make it worse. The mainboard is always a good distance away from the batteries, and can handle the maximum temperature a healthy pack could get up to. I don’t think this will be of any concern. I was quite happy to hear about a new MSX being in the works! It might be time for me to upgrade next summer anyway... 2 Quote Link to comment Share on other sites More sharing options...
Popular Post Jason McNeil Posted November 17, 2019 Popular Post Share Posted November 17, 2019 (edited) On 11/15/2019 at 3:44 PM, Alex Gruzglin said: Jason McNeil, is it true that the 21700 batteries sourced by Gotway are from used or recycled battery packs of Tesla Model 3 cars? If yes, should be this be a point of concern? GW contact is being somewhat coy on this question: from what I'm told, they are 'repurposed', but before using, the cells are individually checked for IR & random sampling for capacity. The guys at GW know their batteries, from a Distributors point of few, GW packs have the lowest failure rate of any vendor, the normal 18650 Panasonic GAs have earned the AAA+ grade—we haven't had a single bad cell in any of the GW packs sold to date. There's a chap who did an incredible cell comparison over on the eBoard forum. His conclusions for the high draw application of Electric Skateboards, is that the 18650s still reigns supreme. The Panasonic NCR21700A were not evaluated; also with the 5-10x the cell count, multiple-parallels, in high end GW, the individual cells do not draw anything like the same amount of amperage as on an eBoard. In a 24s4p configuration, even 5A/cell load x 4p x 100.8v = >2000W sustained, which is more than ample for just about any scenario, therefore I don't think we should be too concerned about the lack of high current lifespan on the 21700. A more analogous use case is in a Model 3, where these vehicles are expected to have a >500k miles battery. https://www.electric-skateboard.builders/t/my-findings-on-18650s-and-21700s-and-a-little-awards-show-at-the-end/87095 Edited November 17, 2019 by Jason McNeil 11 Quote Link to comment Share on other sites More sharing options...
Aneta Posted November 17, 2019 Share Posted November 17, 2019 1 hour ago, Jason McNeil said: GW contact is being somewhat coy on this question: from what I'm told, they are 'repurposed', but before using, the cells are individually checked for IR & random sampling for capacity. I think that regardless of used cell quality, the average number of cycles they went through MUST be revealed. Truth/transparency in advertising. It's an important consideration for the customers. Otherwise, car dealerships can sell cars with 30K miles on them as "new" because "they run great". A used cell is a used cell, period. 1 Quote Link to comment Share on other sites More sharing options...
Planemo Posted November 17, 2019 Share Posted November 17, 2019 Totally agree. I would be super pi$$ed if my new wheel had used cells in it even though they may run to spec at the time of testing. It's particularly relevant if you buy a wheel and shortly after decide to fit an extra pack (as I may well do) with new cells. The original cells may have hundreds of cycles on them and at some point this will cause a problem with the new pack you have made. You simply cannot sell something as 'new' when that product contains used items which have a limited cycle span. I am very much hoping that GW isn't doing this. 1 Quote Link to comment Share on other sites More sharing options...
Popular Post Fuerte Posted November 18, 2019 Popular Post Share Posted November 18, 2019 (edited) I am just getting excited for my new MsuperX 100volt that will be at my house Tuesday. I am coming up from a KingSong 14C, so this will be a huge improvement and I am very excited about the bigger pedals. By the way, shout out to Jason, he was kind enough to talk to me on the phone to help me decide between a Kingsong 18 xl, 16x and msuperx. Edited November 18, 2019 by Fuerte 5 Quote Link to comment Share on other sites More sharing options...
ZenRyder Posted November 18, 2019 Share Posted November 18, 2019 2 minutes ago, Fuerte said: I am just getting excited for my new MsuperX 100volt that will be at my house Tuesday. I am coming up from a KingSong 14C, so this will be a huge improvement and I am very excited about the bigger pedals. By the way, shout out to Jason, he was kind enough to talk to me on the phone to help me decide between a Kingsong 18 xl, 16x and msuperx. I went from a KS 14D to the MSX 100v. You're gonna love it!! 1 Quote Link to comment Share on other sites More sharing options...
Popular Post Jason McNeil Posted November 18, 2019 Popular Post Share Posted November 18, 2019 17 hours ago, Aneta said: I think that regardless of used cell quality, the average number of cycles they went through MUST be revealed. Truth/transparency in advertising. It's an important consideration for the customers. Otherwise, car dealerships can sell cars with 30K miles on them as "new" because "they run great". A used cell is a used cell, period. On further probing the question of cell provenance, the Gotway boss said that they were exploring options, including repurposed model 3 cells, but ultimately decided to go for new cells. 11 Quote Link to comment Share on other sites More sharing options...
Fuerte Posted November 19, 2019 Share Posted November 19, 2019 What have people used to protect their MSuperx EUCs? Quote Link to comment Share on other sites More sharing options...
Tomek Posted November 19, 2019 Share Posted November 19, 2019 (edited) On 11/15/2019 at 8:36 PM, Jason McNeil said: With the Nikola, this leaves the top slot available for a 3rd 18650 615Wh pack. I asked GW if this would work, but they're adamant it's not supported & shouldn't be used. Can't really see why, sure there would be a lower drain rate from the 3rd pack, the bulk of the load would be maintained from the 2x 21700s, unless I'm missing something here, what harm would that do.... I guess 18650 cells have a different charging/discharging speed than 21700. For the same reason that you shouldn't mix cells of different age or model in one pack, you shouldn't mix packs of different cells. The 18650 would presumably charge/discharge faster, would get strained more in the process and eventually fail (much) sooner than when combined with alike packs. Edited November 19, 2019 by Tomek 2 Quote Link to comment Share on other sites More sharing options...
Declan acoustic-unicyclist Posted November 21, 2019 Share Posted November 21, 2019 On 11/18/2019 at 10:51 PM, Fuerte said: What have people used to protect their MSuperx EUCs? This is a fiberglass case with a lifetime warranty for the MsuperX. https://www.ebay.com/itm/Protection-casing-Gotway-Msuper-X/401959754040?hash=item5d96ab1938:g:R5kAAOSwt35dzmRQ 2 Quote Link to comment Share on other sites More sharing options...
Fuerte Posted November 21, 2019 Share Posted November 21, 2019 That is cool Declan, but wow, that is expensive. I just got some foam that I am going to wrap it in for the short term. Quote Link to comment Share on other sites More sharing options...
Fuerte Posted November 21, 2019 Share Posted November 21, 2019 Is there a place to buy the mudflap for the msx 100 v? Mine didn't come with one and I thought they were standard, but I guess not. Quote Link to comment Share on other sites More sharing options...
FlyboyEUC Posted November 23, 2019 Share Posted November 23, 2019 On 11/21/2019 at 11:55 AM, Fuerte said: Is there a place to buy the mudflap for the msx 100 v? If you purchased from ewheels, check with them. If you bought it from someone else, then there is @EUC GUY. Not sure what is store is called at the moment but a quick Google search can answer that for you. Quote Link to comment Share on other sites More sharing options...
xorbe Posted November 23, 2019 Share Posted November 23, 2019 I ran into someone riding the 100V MSX today ... man, I don't need a 5th wheel! 1 Quote Link to comment Share on other sites More sharing options...
atdlzpae Posted November 23, 2019 Share Posted November 23, 2019 (edited) @xorbe You do! You don't have a proper 18' for off-roading. Buy an MSX and strap a C-186 or H-666 on it!!! Edited November 23, 2019 by atdlzpae 3 Quote Link to comment Share on other sites More sharing options...
EUC Custom Power-Pads Posted November 23, 2019 Share Posted November 23, 2019 (edited) 1 hour ago, xorbe said: I ran into someone riding the 100V MSX today ... man, I don't need a 5th wheel! I already have the 100V MSX in my head, although I absolutely don't like the look and quality. I hope that until spring a better alternative will emerge. But I want an official 100V with at least 1600wh. Edited November 23, 2019 by buell47 Quote Link to comment Share on other sites More sharing options...
FreeRide Posted November 23, 2019 Share Posted November 23, 2019 On 11/21/2019 at 2:26 PM, Declan acoustic-unicyclist said: This is a fiberglass case with a lifetime warranty for the MsuperX. https://www.ebay.com/itm/Protection-casing-Gotway-Msuper-X/401959754040?hash=item5d96ab1938:g:R5kAAOSwt35dzmRQ Looks pretty good, but the company won't be around long enough to offer a Lifetime warranty. Also since it is a sleeve design, having it installed does not mean the original case will not crack. Quote Link to comment Share on other sites More sharing options...
Declan acoustic-unicyclist Posted November 26, 2019 Share Posted November 26, 2019 On 11/21/2019 at 2:53 PM, Fuerte said: That is cool Declan, but wow, that is expensive. I just got some foam that I am going to wrap it in for the short term. My wheel was wrapped in lots of thick foam when I dropped it at 30mph (3rd drop above 20mph) The left side split open and the pack hit the concrete. The wheel still rode fine, but the foam did very little to protect it in that kind of tumbling crash. Still a good idea though... Quote Link to comment Share on other sites More sharing options...
mrelwood Posted November 27, 2019 Share Posted November 27, 2019 9 hours ago, Declan acoustic-unicyclist said: My wheel was wrapped in lots of thick foam when I dropped it at 30mph (3rd drop above 20mph) The left side split open and the pack hit the concrete. The wheel still rode fine, but the foam did very little to protect it in that kind of tumbling crash. Still a good idea though... 30mph is indeed a speed that would require a lot of protection from all directions, for both the rider and the wheel. Luckily the beginner’s tumbles tend to happen at around 5mph. What kind of foam did you use, btw? Closer to yoga mat or pillow variety? Quote Link to comment Share on other sites More sharing options...
meepmeepmayer Posted November 27, 2019 Share Posted November 27, 2019 Firmware problem information split for better visibility. 2 Quote Link to comment Share on other sites More sharing options...
Declan acoustic-unicyclist Posted December 3, 2019 Share Posted December 3, 2019 On 11/26/2019 at 7:32 PM, mrelwood said: What kind of foam did you use, btw? Closer to yoga mat or pillow variety? I used Neoprene Foam, it's closer to a yoga mat. The intended purpose was for side pads, but I added some extra as protection 1 Quote Link to comment Share on other sites More sharing options...
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