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  1. h0tr0d

    Electric kart

    Awesome results and evolution!!!
  2. h0tr0d

    how to program a sevcon gen4

    Still no luck :cry: Looking at this, any advice?? Thanks!
  3. h0tr0d

    how to program a sevcon gen4

    When the controller gets stuck in preop what do you guys do? Do you use any of this commands? get_operational sdo_abort_decode check_duplicate_cobids is_node_present nodes_detected login fpo preop fpo op
  4. h0tr0d

    EV Motor Not Powerful Enough? Make Your Own.

    Awesome!
  5. h0tr0d

    Sevcon Gen4 Problem - any tips?

    Hello everyone, I have a Govecs scooter that was working beautifully until yesterday... yesterday i was modding some parameters (not the first time) and decided to change the encoder angle (for the 1st time) and, all of the sudden, the controller stopped working. What I see in the DVT is...
  6. h0tr0d

    Samsung INR18650-25R cycle test.

    Awesome! 2C is 5A, 20% above the max recommended... Be sure to measure the temperature, if you can! :) Would be EXTRA "Awesome" if you had 2 cells, one with fan cooling, the other without any forced cooling.
  7. h0tr0d

    Samsung INR18650-25R cycle test.

    Ok then, 2C charge/discharge, 4.1V - 3.3V?
  8. h0tr0d

    Samsung INR18650-25R cycle test.

    To simulate aggressive riding and regen, can you do this? -Discharge 4C 10s -Charge 2C 10s Measure temperature all the way.
  9. h0tr0d

    Samsung INR18650-25R cycle test.

    EDIT: 80ºC @ 3C 6 C discharge? HOT!
  10. h0tr0d

    Ultra power dense charger project.

    Regarding pulsed battery charging: -Faster Charging time -Higher eff -Lower Cell temperature (!!!) http://120.107.180.177/1832/9901/099-1-17p.pdf
  11. h0tr0d

    how to program a sevcon gen4

    Doc, A few questions, according to the DVT sw: 1 - Why is the "Battery Current Limit Data Source" disabled in the "Master Battery Current limit parameters"? Set up like that you don't have any current limit, at all! I guess the controller will pump 660A from 0 to 6000 rpm, the rev limiter you...
  12. h0tr0d

    JP spot welder

    How about a few of this in parallel? http://www.hobbyking.com/hobbyking/store/__78178__Turnigy_High_Quality_8AWG_Silicone_Wire_1m_Black_.html
  13. h0tr0d

    Triple solid slot Zero 75-7

    Farfle, Does the CAD estimate the motor weight?
  14. h0tr0d

    Ultra power dense charger project.

    Subscribed!
  15. h0tr0d

    Energica Ego

    Already in streets of Portugal https://www.novaenergia.net/forum/viewtopic.php?p=11249405#p11249324
  16. h0tr0d

    World’s first 1 megawatt raceEV to compete at pike peak

    http://www.ppihc.com/wp-content/uploads/2015-PPIHC-Competitor-List.pdf
  17. h0tr0d

    pressurised battery (a mad mans idea)

    Questions: If we pressurize the cell, doesn't it become more difficult for gases to form inside the battery? Also, if suficient pressure is aplied, don't the gases turn back to liquid?
  18. h0tr0d

    World’s first 1 megawatt raceEV to compete at pike peak

    They all use Remy's High Voltage Hairpin motor cores, designed in 2009, the same used in the BMW X6 hybrid, for example
  19. h0tr0d

    Triple solid slot Zero 75-7

    I know it's difficult... If a sevcon can handle a 4t, single stack, that's .117*(4/9)=. 052mH Using sevcons, you'll probably have to make two triple motors...
  20. h0tr0d

    Triple solid slot Zero 75-7

    don't forget to put the rotor in place to measure it properly
  21. h0tr0d

    Triple solid slot Zero 75-7

    I think the formula is: inductance initial * (Turns final / Turns initial)^2 * (Stator Final / Stator initial) = inductance final .117 * 1/6^2 * 6 = .117/6 Which give .0195 mH (emotor is probably more precise, magnetic fields, end turns, etc.) Next year we'll have 2x 75-7 motor per wheel (8...
  22. h0tr0d

    Tesla Powerwall $350 / kwh Retail

    If the difference between the 2 batteries is $500 and the "installation, a maintenance agreement, the electrical inverter and control systems" are all the same, why is my math wrong? Who cares about the battery price, people need the complete solution. And Tesla only sells the batteries to...
  23. h0tr0d

    Tesla Powerwall $350 / kwh Retail

    The difference between the 7 kWh and the 10 is $500, so $6640. I imagine that SolarCity, which Musk is Chairman, will "charge reasonable prices"...
  24. h0tr0d

    Tesla Powerwall $350 / kwh Retail

    Hum... "For a 10 kilowatt-hour system, customers can prepay $5,000 for a nine-year lease, which includes installation, a maintenance agreement, the electrical inverter and control systems. Customers can also buy the same system outright for $7,140"...
  25. h0tr0d

    Tesla Powerwall $350 / kwh Retail

    For all the "haters" of lead acid batteries (myself included) here is a 3650 cycles @ 80% DOD proven application: http://unesdoc.unesco.org/images/0009/000916/091670eo.pdf Page 78 of the PDF
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