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Cuboid Help

Discussion in 'Cloud Chasers' started by danny c, Apr 24, 2016.

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  1. danny c

    danny c Senior Member ECF Veteran

    Apr 9, 2016
    uk
    I recently bought a tvf4 to sit on my cuboid, when I put the quad coil in I was suprised when I couldn't go any higher than 106w. I now know there is a 25a safety limit.
    So I really want to try the octup...coils, however once again I dont think I'll be able to get anywhere near the 180w max on those coils.
    Is there anything I can do to get dome use out of the 200w I have on this box.
     
  2. danny c

    danny c Senior Member ECF Veteran

    Apr 9, 2016
    uk
    Get some use...sorry typo
     
  3. gardenia_bread

    gardenia_bread Senior Member Verified Member ECF Veteran

    Dec 3, 2015
    i do not own a cuboid but the calculations below might help,

    watts = voltage x current

    since the current limit is 25A, and max voltage is limited by the batteries,

    with fully charged batteries,
    max watts = (4.2v x 2) x 25a = 210w

    with batteries @ 3.6v,
    watts = (3.6v x 2) x 25a = 180w

    this means that your battery needs to be at least 3.6v to hit 180w

    so does your battery have enough voltage? if i remember correctly on a cuboid there's a way to see the individual voltages for the batteries
     
  4. danny c

    danny c Senior Member ECF Veteran

    Apr 9, 2016
    uk
    So I can get higher watts on the triple coil because the resistance is lower, I don't know if battery charge makes a difference.
    I dont know if I can get individual voltage, , just amp readout, coil resistance and voltage.
     
  5. danny c

    danny c Senior Member ECF Veteran

    Apr 9, 2016
    uk
    Sorry the resistance is higher on the triple.
     
  6. gardenia_bread

    gardenia_bread Senior Member Verified Member ECF Veteran

    Dec 3, 2015
    battery charge makes a difference,
    only 2 things can be drawn from the battery, voltage and current,
    if the voltage is low, to achieve the same wattage, more current is needed

    current can be converted to voltage and vice versa
     
  7. danny c

    danny c Senior Member ECF Veteran

    Apr 9, 2016
    uk
    I charged the battery's fully but its still the same, switched to the triple coil and it will go over the recommended wattage for that coil.
    I'm wondering if more powerfil batterys will raise the 25amp limit.
     
  8. gpjoe

    gpjoe Ultra Member Verified Member ECF Veteran

    Oct 30, 2013
    Motown
    Not if the 25a limit is set in the firmware.
     
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  9. danny c

    danny c Senior Member ECF Veteran

    Apr 9, 2016
    uk
    I assume it is now though I cant find much information on this, it makes the 200w update pointless.
    I need to get a new box, been thinking about a wismec rx200 but will check its limits before I buy this time.
     
  10. Rudeboy615

    Rudeboy615 Senior Member ECF Veteran

    Apr 5, 2016
    South Florida
    Go to Ω Ohm's law to see what ohm coil you can use given the 25 amp limit. Example: 25 amp, 200 watts, 8 volts, .32 ohm coil. Anything lower than .32 will have higher than 25 amps while higher ohms will be less amps but more volts. Not sure what the max volts is on the cuboid.
     
  11. danny c

    danny c Senior Member ECF Veteran

    Apr 9, 2016
    uk
    yeah cheers I already got it sorted, 25amp limt so cant use all coils to there max limit. 25amp limit is set solid.
     
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