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First Time Build - Dual MOSFET Dual Parallel LiPo

Discussion in 'Battery Mods' started by Mark Spivey, Oct 29, 2017.

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  1. Mark Spivey

    Mark Spivey Senior Member ECF Veteran

    Jan 21, 2015
    Knoxville, TN
    Building my first Mod. Please chime in if you see where I'm not on the right track or where I could do something better.[​IMG][​IMG][​IMG][​IMG][​IMG][​IMG][​IMG][​IMG][​IMG][​IMG][​IMG][​IMG][​IMG]


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  2. Mark Spivey

    Mark Spivey Senior Member ECF Veteran

    Jan 21, 2015
    Knoxville, TN
    Phoenix Wiring Dual Mode.jpg Slight change in plans... decided to make it a dual mode Mod. Now the challenge of getting it all to fit. ;)
     
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  3. Mark Spivey

    Mark Spivey Senior Member ECF Veteran

    Jan 21, 2015
    Knoxville, TN
    Phoenix Wiring Dual Mode.jpg
     
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  4. Mark Spivey

    Mark Spivey Senior Member ECF Veteran

    Jan 21, 2015
    Knoxville, TN
    [​IMG][​IMG][​IMG][​IMG]


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  5. Dbot87

    Dbot87 Full Member

    Jul 6, 2015
  6. Skreech

    Skreech Senior Member

    Oct 16, 2017
    Ipswich
    What size coil will you be using?
     
  7. Mark Spivey

    Mark Spivey Senior Member ECF Veteran

    Jan 21, 2015
    Knoxville, TN
    TBD. It's going to need a lot of mass and not go below 0.22 Ohms. I'm looking at the initial build being a 1.6 Ohms dual coil 28 AWG Kanthal with an ID of 4 mm and 12 wraps each, due to the heat flux.


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  8. david4500

    david4500 Senior Member ECF Veteran

    Jun 13, 2013
    Interesting! I'll have to take a look at the data sheets for the dual schottky & fet you're using
     
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  9. Mark Spivey

    Mark Spivey Senior Member ECF Veteran

    Jan 21, 2015
    Knoxville, TN
    Your input would be welcomed!


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  10. david4500

    david4500 Senior Member ECF Veteran

    Jun 13, 2013
    Mark, the PLM boards are battery level indicators? Do you have a link to them?
     
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  11. Mark Spivey

    Mark Spivey Senior Member ECF Veteran

    Jan 21, 2015
    Knoxville, TN
    Yes... I will look for a link. As I recall, I got them on eBay from China.


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  12. Mark Spivey

    Mark Spivey Senior Member ECF Veteran

    Jan 21, 2015
    Knoxville, TN
  13. david4500

    david4500 Senior Member ECF Veteran

    Jun 13, 2013
    rfp30n06le - RDS ON 47 milliohms is too high. You want about 2 milliohms or less.

    mbr6045wt - Forward voltage (voltage drop) is at least 0.55V. You could use pfets instead of a rectifier diodes for better performance. http://www.ti.com/lit/an/slva139/slva139.pdf
     
  14. Mark Spivey

    Mark Spivey Senior Member ECF Veteran

    Jan 21, 2015
    Knoxville, TN
    True... I was willing to accept the voltage drop for the purpose of LiPo pack isolation to individually monitor the cells. I didn’t think about utilizing a P-Type MOSFET. I may do a retrofit after I’m done since I don’t have any of those on hand (and I might need to put a DPST fire button in too, which I also don’t have). My Vape budget for the year is exhausted. Thanks for the feedback!


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  15. Mark Spivey

    Mark Spivey Senior Member ECF Veteran

    Jan 21, 2015
    Knoxville, TN
    I'm thinking the retrofit will include a IPP023N10N5 N-Channel MOSFET and a SQP90P06-07L P-Channel MOSFET. I wasn't able to find any MOSFETs that are more efficient and relatively low cost. This will need to be a 2018 thing since funds are going to be extra tight until mid January.
     
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  16. Mark Spivey

    Mark Spivey Senior Member ECF Veteran

    Jan 21, 2015
    Knoxville, TN
    Putting up a revised drawing. I ran out of room to put everything in the Mod that I wanted. So, I've gone to a three wire LED VM to act as a pilot (Mod on) light reading 0.00, provide a relative voltage (for adjusting) in PWM mode, and actual voltage in unregulated mode when the fire button is pushed. The pilot LED or the LED VM had to be removed from play. Obvious selection for me... Bye bye pilot (on indicator) LED. Phoenix Wiring Dual Mode R2.jpg
     
  17. Mark Spivey

    Mark Spivey Senior Member ECF Veteran

    Jan 21, 2015
    Knoxville, TN
    A little rough but it will do its job.[​IMG][​IMG]


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  18. david4500

    david4500 Senior Member ECF Veteran

    Jun 13, 2013
    Will you be using fuses like you have shown in your diagram?
     
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  19. Mark Spivey

    Mark Spivey Senior Member ECF Veteran

    Jan 21, 2015
    Knoxville, TN
    Yes, absolutely! They will be between the battery positive (XT-30) connections and the Schottky Diode.


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  20. Mark Spivey

    Mark Spivey Senior Member ECF Veteran

    Jan 21, 2015
    Knoxville, TN
    Finally finished except the cleaning. Had to replace multiple parts multiple times but finally working as it should. Barely able to fit everything into the housing.
    [​IMG][​IMG][​IMG]


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