Search results

Date Relevance Most replies

  1. C

    Freygeist (Lightweight E-Bike from Germany)

    And I don't understand why someone would put a 2k watt motor on a bike, feel comfortable wearing a motorcycle helmet and risk severe fines if caught by the police riding in urban areas. But I know people do. So what!? The Freygeist ebike has style and fulfills a need to get around town quickly...
  2. C

    Freygeist (Lightweight E-Bike from Germany)

    I'm looking for a minimalistic frameset like this Freygeist model, basically a frame that allows me to hide a battery inside. Anyone know of an alternative project?
  3. C

    LMX P2 : Freeride trials motorcycle frame development

    post from 8th September 2014 page 12
  4. C

    LMX P2 : Freeride trials motorcycle frame development

    How does that work? Removing the side plates to accomodate a larger motor? How do you ensure stability then? I'm surprised you get so much power out of a 450w mid drive. I watched a couple of videos of the cyclone motor and they generally need much higher wattage setups for powerful ebikes...
  5. C

    Noobie planning an Electric bike with >30 mph

    @mac, thanks will check it out.
  6. C

    Noobie planning an Electric bike with >30 mph

    OK, but why the need for a BMS AND protection at the individual cell level. Seems to me that there is a redundant layer of protection here: A curcuit board attached to each cell and then another larger curcuit board to protect a bunch of cells. Can I safely charge and discharge unprotected...
  7. C

    Noobie planning an Electric bike with >30 mph

    Many of these small battery packs come with a PCB, so the single pack is "protected" for overcharge. I was thinking there might be a way to hook each pack to a BMS rather than each cell in a pack. I'm also looking into Sony Konion cells that are said to be drift free and wouldn't need a BMS at...
  8. C

    Noobie planning an Electric bike with >30 mph

    Can anyone tell me what kind of cable/adaptor this is? I noticed that it may be cheaper to purchase battery packs that were designed for applications other than ebikes. Obviously, I would need to add several of those in series and parallel to achieve the desired battery capacity and voltage...
  9. C

    Noobie planning an Electric bike with >30 mph

    Would soldering work equally well as spot welding? That seems more doable to me. @mac, yes there are single line strips available just as there are plates for custom cutting...
  10. C

    Noobie planning an Electric bike with >30 mph

    You can do the same with 18650 cell brackets and metal strips, don't you? Google image search http://tinyurl.com/qaa8nk9
  11. C

    Noobie planning an Electric bike with >30 mph

    But there is nothing to learn from a "plug and play" bike. I want to make my hands dirty, just not burn them, :wink:
  12. C

    Noobie planning an Electric bike with >30 mph

    OK, I'm really confused about battery management systems here. There seem to be different types and layers of "protection". What do I really need to "just" charge by batteries safely? Are all these complementary or do they replace each other? - At the individual cell level there are protected...
  13. C

    Noobie planning an Electric bike with >30 mph

    This is what I was looking at just off alibaba. But I also see 18650 cells with 1c continuous discharge. Makes no sense to me. These type of cells are supposed to be standardized. :?
  14. C

    Noobie planning an Electric bike with >30 mph

    OK, many thanks. Here is one more question: Does the continuous discharge (rated in C) multiplies when two cells are put in parallel? I'm looking at standard 18650 li-ion cells. 3.7V, 2600mAH. Now a single cell is usually said to have a discharge current of 0.2C which seems pretty low. If I...
  15. C

    Noobie planning an Electric bike with >30 mph

    windtrader Thanks for your notes. I think this helped me understanding this subject better. But let me take the specs for the lipo battery that mac has posted for clarification. Following your argumentation ("like all Lithium Ion type of batteries all have several C ratings. Using this as an...
  16. C

    Noobie planning an Electric bike with >30 mph

    Still having troubles with battery / controller configurations. For illustrative purposes I found an example of a 48V frame battery ready to purchase. The setup is 13s4p of 3.7V 2900mAH li-ion cells for 48V voltage and 11.6 AH. So far so good. Now, my problem is the continuous current and how...
  17. C

    Noobie planning an Electric bike with >30 mph

    mac, 18650 li-ion cells may be another battery option to consider - Safer than lipo - Cheaper than lifepo4 - Can be configured in any form or shape - With 700 cycles they are less enduring than lifepo4, but after at least 3 years of continuous use I would probably want to switch to the then...
  18. C

    Noobie planning an Electric bike with >30 mph

    Someone please help me with controller configuration. Say I wanted to go with a 48V 1000w motor setup (I haven't made a decision yet). I know that it is crucial to select a matching controller to avoid overheating in peak time demand. A 48V 20A (=960w) controller just seems in balance with the...
  19. C

    Noobie planning an Electric bike with >30 mph

    If I use a direct drive hub motor, can I still shift through the gears?
  20. C

    Noobie planning an Electric bike with >30 mph

    I really have some reading to do on controllers. But this is just what I need to disguise the true power . By "program the controller" you mean these modes can be adjusted on the device or would I also need to learn a programming language? Good point! An alternative to battery packs would be...
  21. C

    Noobie planning an Electric bike with >30 mph

    Just completed reading the entire thread. And enjoyed it thoroughly. I'm also new to ebikes and can relate to ALL of the issues and questions raised by the person who started this discussion (less the weight issue maybe :wink: ). I started reading ES some time ago with the simple idea of a...
Back
Top