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  1. bwoodroof

    DIY Box Unregulated Box Mod - 450W Build Log

    I just wanted to overbuild, like you said i never plan on vaping @ ~400W but to be safe I am building this way.
  2. bwoodroof

    DIY Box Unregulated Box Mod - 450W Build Log

  3. bwoodroof

    DIY Box Unregulated Box Mod - 450W Build Log

    I know that is it taken out of context, I plan on load testing the batteries and checking temperature before using them that low. Plus I never plan on going below .1 when vaping
  4. bwoodroof

    DIY Box Unregulated Box Mod - 450W Build Log

    RDS (each) = 0.0022 ohms (Extrapolation from data sheet for 3.6V) RDS (2 in Parallel) = 0.0011 ohms RDS (4 in Parallel) = 0.000425 ohms I = 123 A I^2 = 15129 A P = I^2 * RDS P(2 in Parallel) = 15129*0.0011 = 16.64W (8.32 Watts Per Mosfet) P(4 in Parallel) = 15129*0.00055 = 8.32 (2.08 Watts...
  5. bwoodroof

    DIY Box Unregulated Box Mod - 450W Build Log

    And carry it in a backpack at VCC :D
  6. bwoodroof

    DIY Box Unregulated Box Mod - 450W Build Log

    Came from Sony VTC4s Spec Sheet
  7. bwoodroof

    DIY Box Unregulated Box Mod - 450W Build Log

    The Mosfet's "on" resistance (Rds) will increase as it's temperature rises so parallel Mosfets will "self balance". If you have four FETs in parallel, the one that conducts the most current will also be the one that runs the hottest; therefore it's Rds(on) resistance will rise and the other...
  8. bwoodroof

    DIY Box Unregulated Box Mod - 450W Build Log

    Check me on this WSK01 RDS (each) = 0.0017 ohms RDS (2 in Parallel) = 0.00085 ohms RDS (4 in Parallel) = 0.000425 ohms I = 123 A I^2 = 15129 A P = I^2 * RDS P(2 in Parallel) = 15129*0.00085 = 12.85W (6.43 Watts Per Mosfet) P(4 in Parallel) = 15129*0.000425 = 6.43W (1.61 Watts Per Mosfet)
  9. bwoodroof

    DIY Box Unregulated Box Mod - 450W Build Log

    Also I am thinking about two more mosfets in this build in parallel with the others, WKS01 you have been helpful, I do value your knowledge that you have brought to this discussion.
  10. bwoodroof

    DIY Box Unregulated Box Mod - 450W Build Log

    What are you basing your opinion on about wiring standards??? 14 AWG is safe for that amount of current, I just chose 12 because there is less loss in it. Have you personally load tested these batteries? And seriously, do you possibly think that I am going to vape at 450?
  11. bwoodroof

    DIY Box Unregulated Box Mod - 450W Build Log

    Note to anyone looking at this build I do not recommend vaping down to .03, however build like you are going to, overhead is under rated.
  12. bwoodroof

    DIY Box Unregulated Box Mod - 450W Build Log

    I have fluke multimeters that can measure that low If a Mosfet fails at .03 ohms then you would have magic smoke rolling out of your mod and possible loud pop. If a Mosfet is slower than the other one, then you are gonna get a one mosfet that will get warmer than another, but we are talking in...
  13. bwoodroof

    DIY Box Unregulated Box Mod - 450W Build Log

    Two VTC5s can handle the 123A (80 amp for 8 sec per battery). 12AWG wire can handle that amount of current @ 4 ~6" (with 3.5% voltage drop) if it were feet it would be different. I am aware of the thermal limits of MOSFETS.
  14. bwoodroof

    DIY Box Unregulated Box Mod - 450W Build Log

    Voltage drop is less than 4% at 450W 12AWG wiring from batteries to Mosfets to 510
  15. bwoodroof

    DIY Box Unregulated Box Mod - 450W Build Log

    The N-Channel Mosfets, in this build, can handle 375 watts max each - there are two in this build in parallel
  16. bwoodroof

    DIY Box Unregulated Box Mod - 450W Build Log

    build at .03, the batteries and circuitry can handle it 3.7V @ .03 ohms = 123 Amps and 456 watts
  17. bwoodroof

    DIY Box Unregulated Box Mod - 450W Build Log

    Sony VTC5s
  18. bwoodroof

    DIY Box Unregulated Box Mod - 450W Build Log

    Body 510 Connector (w/ Lock Washer) Charger Switch Power Port Power Cord 2 x N-Channel Mosfet 15k 1/4w Resistor Battery Holder Volt Meter
  19. bwoodroof

    DIY Box Unregulated Box Mod - 450W Build Log

  20. bwoodroof

    "Real men smoke cigarettes!"

    Do what you think is right. I think his lack of knowledge of electronic cigarettes nullifies his premise. Just my outlook on the situation.
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