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  1. J

    Is a lightweight velomobile legally capable of 50mph feasible

    Major redesign. At 50mph it needs to be crashworthy, and most velomobiles have zero consideration for that (since at their speeds the energy to be dissipated is pretty minimal.) So that's a big change to the cabin and the front (AND rear) of the vehicle. All that comes at a cost - weight - so...
  2. J

    Reverse thinking...

    Because the time you really care about handling and stability is during an emergency stop. And at that time, two wheels forward gives you the most stability and resistance to rolling. For low speeds a design like this works well...
  3. J

    Ebike, battery splitter to backup battery

    Yes. Note that you can't use them with regen braking, but it looks like that bike is a mid-drive and thus cannot regen brake. No. The "high" battery will support 100% of the load until it reaches the voltage of the "low" battery, then both will supply the load. A fuse is a good idea in any...
  4. J

    Motor running backwards...

    Could you have pulled out one or more of the Hall sensors? If they are in the wrong position that could do what you state.
  5. J

    Inductance question when connecting 2 batteries in parallel using ideal diodes

    Zener - near motor. Try a zener like https://www.digikey.com/en/products/detail/solid-state-inc/BZY91C47/14546632
  6. J

    Inductance question when connecting 2 batteries in parallel using ideal diodes

    Risks: 1) Regen will blow up the controller. 2) If you don't have regen but do have direct drive, if you go over base speed the voltage will climb and potentially damage things. I'd add at least a zener clamp for this, and then monitor the zener. If it gets really hot then it's absorbing too...
  7. J

    25cent wind noise mitigation

    If you are going over 60mph you need a full face helmet. Full stop.
  8. J

    Why touchscreens are in every new car

    Haptics can help with that. I have no problem with on-screen controls for 90% of car controls, especially if they are done well (haptics, large buttons, good registration etc.) But the most often used controls, and the controls you need in a hurry, should always be manual: Directional Wipers...
  9. J

    Why touchscreens are in every new car

    Per a new law passed in the EU, a car built there cannot get a top safety rating unless it uses physical controls for the most basic functions (turn signal, lights, wipers etc.) https://www.theverge.com/2024/3/5/24091043/euro-ncap-safety-rating-europe-2026-touchscreen-buttons-dials
  10. J

    Grin’s perspective of Ebike fires

    ?? It did. The first Prius was sold in 2001. The first Leaf was sold in 2011. Right now I have a Prius Prime for my daily driver, which is a pluggable hybrid. I get about 26 miles of range, which covers my commuting and shopping. I use about a gallon of gas a month for the occasional longer...
  11. J

    Grin’s perspective of Ebike fires

    In the direction of BYD, Ford, GM and Nissan. Hybrids (HEVs) get all their energy from gasoline. I think you're talking about pluggable hybrids (PHEVs.) They are a good option as well. Have you driven the 2023 Prius?
  12. J

    Reverse thinking...

    You can do a lot with a good tadpole trike with a fairing. But you're not going to (safely) get to 60mph. That's more work than you will want to put into it, unless you're a mechanical engineer with a long, long history of design.
  13. J

    Biggest Problems With DIY e-Anything

    If you don't have an electronics background there's a limit to what you can do with plug-and-play. Bluetti power systems? They're plug and play. You can put them together and have a pretty high certainty they will work. A complete Grin bike conversion system? More complex - it will take...
  14. J

    EU type 2 connector "slow" dc charging

    I have never seen any charger that supports DC charging on any pins other than the Combo pins. Nor have I ever seen any car that uses this feature. I strongly suspect that this feature is like the Status D state on the Control Pilot in the J1772 standard. It's in the spec but no one ever uses...
  15. J

    EU type 2 connector "slow" dc charging

    Does your car support that?
  16. J

    EU type 2 connector "slow" dc charging

    Agreed. I can think of several ways to design a power factor corrected AC to DC that would either not work or be destroyed if you tried to run it on DC. Many DO work that way (most of the Meanwells for example) but that doesn't mean all or even most will.
  17. J

    EU type 2 connector "slow" dc charging

    You can do it but it is not easy. You have to control both current and voltage; voltage control alone is insufficient. Different chargers use different standards. The new NACS standard uses PLC (powerline communication, a conducted RF scheme) over the CP pin. The CHAdeMO standard uses CAN...
  18. J

    Question about DIY hybrid EV

    You would get the most power from a power factor corrected charger or power supply. If you are engine (not copper) limited, then you can do almost as well by using a plain old rectifier. A rectifier will give you 320 volts if you use a full bridge. It will be hard on the copper, but it will work.
  19. J

    Question about DIY hybrid EV

    As a final comment, rectifier based approaches also give you a very poor power factor, since you can only use the "top" of the AC waveform. This leads to (for example) a 10KW generator only able to provide 6KW (but using as much gas as a 10KW load would.)
  20. J

    Your wish list for ES in 2024

    I don't know. I guess it would depend on the implementation. (i.e. could it be limited to results within ES.com?)
  21. J

    Your wish list for ES in 2024

    My biggest request would be more powerful search functions. Search with booleans, sort by date/relevance, exclude posts based on criteria, matches on equivalent and/or misspelled words.
  22. J

    My own battery store and battery repair shop: ( Goodboybattery

    Good luck! Hope you find partners that work out.
  23. J

    Growing pain with ebikes.

    Satanic rock songs!
  24. J

    Active pre-charge/inrush control

    Note that it is quite possible to not notice much heat being generated and blow out the resistor anyway. Internal temperatures do not always match external temperatures, and very rapid internal temperature rises can fracture ceramic resistors even if they aren't particularly hot when they fail...
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