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  1. J

    Thread for new battery breakthrough PR releases

    Using neutron reflectometry to look inside working solid-state battery and discover its key to success. Using neutron reflectometry to look inside working solid-state battery and discover its key to success
  2. J

    Lucid teardown

    I had a really hard time listening to that video. Lots of words but nothing shared as proof or even a reference to back any of it up along with a lot of clickbait. The Aston Martin info is interesting. I'm selfishly hoping lucid sells motors, inverters, chargers, batteries, etc. but I'm not...
  3. J

    Lucid teardown

    The Lucid efficiency numbers are a bit better than other manufacturers. It's an extra 25% range vs the Tesla setup if true is why I mentioned it. The sapphire rear motors are compact but pretty wide even for a large car, I'm curious to see if they were able to tuck in the gear reduction into...
  4. J

    Hemi eTorque motor adpatation

    Might be worth looking around at openinverter.org wiki & the forums there. They have some can man in the middle and the zombieverter boards to control oe setups. The dc-dc, fets, and capacitors may have a higher max voltage than required for 48v. You could maybe run it at a higher voltage if...
  5. J

    Hemi eTorque motor adpatation

    I'd suggest replying to JK130 in his thread about using this motor & controller, see if he made any progress with it to avoid doubling efforts. You mentioned you're not an EE, but we don't know what your skillsets are. Your skills might complement his and might be able to help move the project...
  6. J

    connecting external SSR to BMS output for higher current capability

    You might be able to find a latching contactor. But not sure any off the shelf BMS will be able to control it as is. There are also circuits that can do full power then drop to a lower current output (commonly 1/4 the power) to hold the contactor on. Can search "peak and hold circuit" if...
  7. J

    Lucid teardown

    It was great to see the two powertrains side by side. But it would have been more apples to apples to see the plaid vs the sapphire on the table. It's strange that they list similar efficiencies in their chart. 3.96 miles per kWh for the plaid and 3.99 for the lucid. But the plaid gets 98...
  8. J

    Automatic loading setup for an autonomous vehicle - Will this work?

    Do you have an extra IO that could trigger the charger to start charging?
  9. J

    PaulD's Experiments with Endothermic Potting Compounds

    Magnesium hydroxide powder (like milk of magnesia) might also work well. Should be cheap and readily available.
  10. J

    Automatic loading setup for an autonomous vehicle - Will this work?

    I'll echo amberwolf's balancing through the dock idea. Extra connections to the charger but less weight on the drone. Only downside is if one cell goes bad, does the drone fall out of the sky? Might be worth having cell monitoring on the drone side to watch battery condition if it doesn't...
  11. J

    polyester resin and baking soda

    Why not get some fiberglass or Kevlar pulp? Baking soda is an accelerant for super glue.
  12. J

    PaulD's Experiments with Endothermic Potting Compounds

    Thanks for sharing your research PaulD! To add to amberwolf's post, if the additives are not well encapsulated it could make a salt bath for the battery to quickly corrode. Might be worth considering some thermal cycling (with humidity) with a clean and dry piece of steel embedded in your mix...
  13. J

    Modular, Multi-Platform, 300A ESC

    From post #7, BD - "So i left this for last because it's the juicyest bit :) First - SMD Pads, because the TH bump on the other side would force us to mout the FETs far from board - which is not what I hope." (Sorry for bad formatting..) Mosfets will be in the way of thru holes for battery...
  14. J

    Modular, Multi-Platform, 300A ESC

    I've heard this mentioned a bunch, but the copper layers in the pcb would likely separate / delaminate as well if it was an issue. Does someone have a documented incidence of this happening? I know it can bend if they're soldered at different temps as it cools - avoid doing that. Consider...
  15. J

    Lucid teardown

    I think they're using the front axle / motor in Formula E for regen only. I hope their packaging and build efficiencies will end up in other products or at least push others to improve. Or maybe they will sell their motors to others. I haven't been able to find any info on being able to buy...
  16. J

    Lucid teardown

    Thanks for posting this, it's really interesting to see inside. It's clear they have some talented engineers. I'm not sure if this is the same one, https://electrek.co/2023/01/25/lucid-ev-racing-motor-formula-e-gen3-cars-atieva/
  17. J

    Active pre-charge/inrush control

    Have you tried hard switching the pre-charge mosfet with a resistor in series (pre-charge resistor) then switching the main mosfet on when the pre-charge voltage is close to battery voltage? I don't think your pre-charge mosfets will last long running in the ohmnic range. From Failure...
  18. J

    Attempt to achieve torque control of an induction motor via a tachometer and off the shelf vfd

    Too many workarounds to make something you have end up working not so well. Also missing a lot of dead end details to be able to successfully cobble a bunch of stuff together that will make this difficult to implement. Consider looking at a belt assist hybrid setup and see if it makes sense for...
  19. J

    Where to buy EM 200 96V Controller?

    If they don't reply is it still worth it to buy one? I assume their support is not as good as their sales follow through.
  20. J

    Nanjing far driver controllers

    The higher voltage version will likely be more efficient. Less heat and losses.
  21. J

    Controller for (re)generator function only?

    For question 1: There will be some system losses turning the generator at no regeneration. The generator will make different voltages at different rpms when it's not connected to a battery. The generator might not regen at low rpm if it's not spinning fast enough to make the voltage required to...
  22. J

    DIY Toroidal Axial Flux PM

    It's not easy to bond new composites to already cured composites. You could cure the carbon with a peel ply or maybe find some with a surface finish ready for bonding. You could look at using other core materials too. Balsa might work well (as long as it gets sealed.) It can also be easily laser...
  23. J

    Workshop Suggestions for prototyping

    There are a lot of different disciplines to build motors and controllers. It's a ton of effort to try get good at a few of them. My suggestion is to figure out which ones you can do / want to do and find others / businesses / off the shelf items that can fill in the blanks. Sounds like you want...
  24. J

    Whole home battery / inverter backup design considerations

    The 15k is only potentially an issue if you're running from solar (no grid.) From memory it drops to 12k powered from batteries only. I don't think your garbage disposal or sump pump would overcurrent a 15k inverter unless it was near it's limits. Surge current is: Surge AC Power 10sec...
  25. J

    Obstacles in the Way

    If those 50% were electricity generators / stabilizers as well pricing could be better if private generators weren't greedy. I guess things depend on who is controlling pricing. More suppliers should mean more competitive (lower) generation costs. Curious, does your utility separate out...
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