Recent content by BlueSwordM

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  1. BlueSwordM

    The making of a perfect SecondLifeStorage/BLF Charger: the start of a new venture

    The MOSFETs will be used in full saturation mode, to use them in a linear fashion to replace discharge resistors.
  2. BlueSwordM

    The making of a perfect SecondLifeStorage/BLF Charger: the start of a new venture

    Since the charger will be made of aluminium, the constant current linear FETs that will be used will need to be cooled, since they can output around 17W firing on all cylinders. Edit: The MOSFETs will be used in full saturation mode, to use them in a linear fashion to replace discharge resistors.
  3. BlueSwordM

    The making of a perfect SecondLifeStorage/BLF Charger: the start of a new venture

    1) Why would the feature need to be disabled however? Is it because of risks or something? At these current levels, nothing bad should happen. 2) Yeah, but then, the costs would jump up.
  4. BlueSwordM

    The making of a perfect SecondLifeStorage/BLF Charger: the start of a new venture

    Hello again guys and gals. BlueSwordM here. So, I've noticed something interesting here. Over on BLF, a flashlight forum, I've decided to start on the journey of making a product in a domain from which I have a lot of experience in. In this case, it's flashlights,batteries, and chargers. So...
  5. BlueSwordM

    Falling Battery Prices ....

    Tesla is already down to 100$ at the cell level. The goal is 100$/kWh at the pack level, which includes the connections+inverter+cooling.
  6. BlueSwordM

    power cost in your area

    TLDR: Try to be as efficient as possible.
  7. BlueSwordM

    PCB cell holders for size 32650 / 32700?

    You'd have to make it yourself. Would you like some help?
  8. BlueSwordM

    [split] New Firebox Construction (Pond loop & components discussion)

    You still do not want HDPE outside, as UV can degrade it. Your best bet would be black HDPE with a white paint on it.
  9. BlueSwordM

    Cells. Charger with discharging

    For charging, I would just get TP5100s.
  10. BlueSwordM

    soldering tip

    You have to be careful working with copper and tin. Copper is easily eaten by tin at high heat, which destroys the copper relatively quickly. Electrochemistry hurts bare tips a lot.
  11. BlueSwordM

    Upgrading my son's Power Wheels "Yamaha" ATV as a learning project

    I'd recommend running at 50% higher voltage max, so around 18V. That means something like a 4S lithium-ion pack would be your best bet, with a cutoff voltage of 12V being optimal.
  12. BlueSwordM

    Possibly being forced to go off grid sooner than planned in Iowa

    Yes, and I would limit charging to 4,0V/cell for maximum cycle life, and up to 4,2V only when you really need it. We'll try to help you as much as possible, so ask any questions you want.
  13. BlueSwordM

    Safely housing the battery bank

    CO2 will NOT work to extinguish a lithium-ion fire, since during thermal runaway, the cells supply their own oxygen. You need to make a sand pouch which will open during excessive heating, or just spray with water and pray you can recover some cells.
  14. BlueSwordM

    MSD files wanted

    Sorry if this is not for the 20700B, but since 21700s are similar to 20700s, maybe this would suffice? http://www.acebeam.com/download/sample/11102
  15. BlueSwordM

    UK Regulations - All fixed wiring

    Is there a reason that they are so vague in their statements of the regulation? I think the definition of reasonable should be that you take your own risks into your own hands, and that if you want to have certification or insurance, you have to be evaluated fairly in your aptitudes and builds...
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