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  1. Username1

    Using EV Chargers

    For better or worse the anonymity part is very unlikely at this point for multiple reasons. However I would like if the government mandated that DC chargers must provide 0-1000v and allow access to PEVs (with the appropriate safety standards applied of course). Or if a very influential company...
  2. Username1

    Using EV Chargers

    That’s messed up if true, but wouldn’t surprise me. Ideally chargers would be anonymous, widespread, allow all types of PEVs and electric vehicles (0-1000v), and really they should be a public utility. However there’s almost zero chance the government would do this properly, and Tesla is all...
  3. Username1

    Using EV Chargers

    @amberwolf Do you think the V3 chargers can actually charge from 0-500v in practice? I know most other chargers only go as low as 200v (some do 50v), but if superchargers do go to 0v that’s seems like a big deal.
  4. Username1

    Using EV Chargers

    I'm far from an expert on this, but I want to point out some observations I have on the subject. Since the last post here, Tesla's NACS standard has been fully adopted in North America going forward. That seems like a step in the right direction for DC PEV charging for a few reasons. Firstly...
  5. Username1

    CV Charging Sucks?

    What I'm talking about is a charger that does constant current until the chosen max voltage is reached (4.2v for example), and then shuts off instead of continuing to hold the voltage while the current decreases to near zero. In other words, skipping the CV phase by automatically shutting off...
  6. Username1

    CV Charging Sucks?

    I can charge to 80 or 90% no problem using an adjustable CC/CV charger I bought for this purpose. It's not a practical issue I'm personally having, it's about CC/CV as the default method being bad for most customers. If you released a PEV with a CC only charger that displayed 100% after...
  7. Username1

    CV Charging Sucks?

    Sure but what's the point, to add a tiny bit of extra charge while being only a little slower than CC? Why not just do away with CV entirely for the average person/device?
  8. Username1

    CV Charging Sucks?

    Sure it's partly about advocating for lower states of charge, but it's also about NOT using CV as the standard charging method for the masses. The ONLY purpose of CV is to cram 100% charge into battery. Manufacturers from cars to phones all recommend a lower state of charge. The exact...
  9. Username1

    CV Charging Sucks?

    That's correct. Many CC/CV chargers can be set to a lower max voltage such 4.1v or 4.15v per cell, in order to prolong battery health. Instead of lowering the max voltage, you can simply set it to the full 4.2v and it will naturally charge to around 80-90% while charging much faster by skipping CV.
  10. Username1

    Steel Rim as Magnet Backing?

    If you designed it from scratch, could a steel rim itself be used as the magnet back iron? I’m talking about a motorcycle type rim, and placing the magnets on the flat centre channel (facing the hub). Obviously the supports would need to be placed on the sides, not the centre. Is there any...
  11. Username1

    2x Speed = 8x Power?

    Above is a quote I read about this subject, would you say it’s correct? For some reason my mathematically retarded brain can’t understand the 3rd doubling (highlighted in bold). —————————————————————- Let’s give an example using a fixed ride duration. If this is not correct please tell my...
  12. Username1

    2x Speed = 8x Power?

    I’ve read that doubling your speed requires 8x the power, and I’m trying to understand why. Here’s my current understanding… Because the speed is doubled you’re encountering (slamming into) twice as many air molecules, which on its own requires 2x the power. Because the speed is doubled you’re...
  13. Username1

    CV Charging Sucks?

    In my opinion the standard charging method for l-ion should be CC instead of CC/CV. If you think I'm wrong please read this and tell me why because I must be missing something. Constant current (CC) gives a linear increase in charge over time. Once max voltage is reached, you end up with a...
  14. Username1

    External BMS?

    Yeah if you use the external Chargery BMS you need balancing leads coming from your battery. I guess having the BMS in the battery case is best since you only have positive and negative wires leaving the case. This is especially important for swappable batteries, because having to connect...
  15. Username1

    External BMS?

    I was looking at "Chargery" chargers, and saw they also have BMS units that hook up to their charger. Does this mean it's possible to run an ebike battery without any BMS permanently hooked up to the battery? It seems all production ebike batteries use an internal BMS. Could you build your own...
  16. Username1

    PTC Battery Heater?

    I've realized these PTC films have power densities that are way too low. I would need a non-film solid PTC heater, which either transfers heat directly (surface type), or by using a fan. These are either too bulky or have the wrong specifications off the shelf. I'd need to use a conventional...
  17. Username1

    PTC Battery Heater?

    If that's the case, why did they say their 240v film would drop from 240w/m2 to 16w/m2 when using 60v? That's not a linear drop in power as you're describing. Does lower voltage have any effect on the maximum temperature, or is it just too tiny to matter? I guess either way I need to select a...
  18. Username1

    PTC Battery Heater?

    I found another seller with 110v films available with various surface temperatures. They say the 110v versions have the same temperatures as the 220v options listed. Perhaps one of these would be suitable with the 60v battery, but I still don't have an understanding of how to determine...
  19. Username1

    PTC Battery Heater?

    I've been looking on Alibaba and it seems they're sold as floor heating rolls, cut to your desired size. Most are made for 240v and heat up to 60c. This is obviously too hot for batteries, but that's assuming 240v which is 4x the battery voltage. However the seller said that at 60v the power...
  20. Username1

    PTC Battery Heater?

    I want to buy a Dualtron City scooter for year-round use in frigid Canada, so I'm investigating battery heating. The idea is to have the heating entirely powered by, and contained within the removable battery itself. This is because the battery is sealed whereas the compartment isn't (it has...
  21. Username1

    EXTREMO - Scratch built 7kW billet frame scooter

    May I ask which software you used to design the scooter? I would like to learn CAD but don't know which program would be best to learn.
  22. Username1

    Nucular Electronics owner's thread (setup infos, FW updates, links etc.)

    I have a question about the upcoming BMS. It says "For cold weather, the BMS provides for heating the battery." Can someone explain how this is done? It sounds almost too good to be true. So any standard cells would be able to heat themselves without any kind of heater installed?
  23. Username1

    Nucular electronics - complete kit for ev!

    "For cold weather, the BMS provides for heating the battery." Can someone explain how this is done? It sounds almost too good to be true. So any standard cells would be able to heat themselves without any kind of heater installed?
  24. Username1

    Heat Problems from Insulated Batteries?

    My gut feeling was that it probably isn't an problem. I guess using high discharge cells would probably all but guarantee this wouldn't be an issue. I don't think cells are dumping out a ton of heat at reasonable discharge rates, and cells can handle a fair bit of temperature increase.
  25. Username1

    Question About Thermodynamics

    Reading about PTCs is fascinating. They seem like an ideal heat source for batteries, specifically the thin flexible PTC rubber variety.
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