Power in Flux

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Type: Posts; User: Spoonman

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    Sorry, you're right - I was reading that all...

    Sorry, you're right - I was reading that all wrong. Thought that bottom line was stats for 10 modules in parallel.
    In that case you're golden
  2. As I said, just a baseline to tailor from. A...

    As I said, just a baseline to tailor from.

    A centralised motor is definitely the better way to go for higher performance, but there's little benefit to it beyond that IMO.

    Consider that you're...
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    Looks like max 4C discharge on those Energy...

    Looks like max 4C discharge on those Energy modules so your 10S arrangement would peak at 60A, whilst your 5S2P arrangement could only handle 120A.
    The Power modules appear to manage 8C which would...
  4. Looks like an idea candidate for a hub motor...

    Looks like an idea candidate for a hub motor based on that usage profile.
    Simple, costs effective and space efficient.

    Biothunder has a well documented spec here for his effort which will...
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    No chance.

    No chance.
  6. Definitely buy your battery last. The rest of...

    Definitely buy your battery last.

    The rest of it you can buy as you choose but batteries are changing all the time and the project is likely to take you at least a year before you're anywhere...
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    Right so first - you know that you've only got...

    Right so first - you know that you've only got ~90Vnom there right? About 103.5V hot off the charger?
    Those are LiFePO4 cells, so they're nominal at 3.2V not 3.7V.

    As for the Zeva modules - the...
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    Your connection plan looks fine, no problem...

    Your connection plan looks fine, no problem there.
    Serious lump of a pack that!
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    WoW! I had heard they were refocusing but...

    WoW!

    I had heard they were refocusing but that's quite a statement right there.
  10. Thread: Podbuilder

    by Spoonman
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    58,164

    I'd consider a 'cable connected' lockout on the...

    I'd consider a 'cable connected' lockout on the MC contactor - don't want someone trying and drive away while she's plugged in.
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    https://media.giphy.com/media/kWMI4jZKpgTJloYPO7/g...

    https://media.giphy.com/media/kWMI4jZKpgTJloYPO7/giphy.gif
  12. Thread: Podbuilder

    by Spoonman
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    58,164

    Yeah that makes sense now alright - sounds like...

    Yeah that makes sense now alright - sounds like they've an N-channel FET driving the contactor coil.
    Assuming your HV and 12V circuits aren't isolated, you likely need the voltage at the common...
  13. Thread: Podbuilder

    by Spoonman
    Replies
    263
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    58,164

    Hmm... from the reading of that it appears that...

    Hmm... from the reading of that it appears that it has some form of built-in inrush limiting, so it's not out of the question that it has TVS in there too but it doesn't say anything about it which...
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    Interesting move. This quote is promising:...

    Interesting move.

    This quote is promising:
    "Entering the electric bicycle business underscores efforts to remake Harley-Davidson into a more nimble company that reacts quickly to market...
  15. Thread: Podbuilder

    by Spoonman
    Replies
    263
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    58,164

    Breaking on the negative pole has the potential...

    Breaking on the negative pole has the potential to induce an inductive response on the upstream side of the circuit if you interrupt while there's significant current flowing.
    As such I wouldn't...
  16. Thread: Podbuilder

    by Spoonman
    Replies
    263
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    58,164

    Damn that thing looks sweet! I've used Zeva...

    Damn that thing looks sweet!

    I've used Zeva (Aus) and Orion (US).
    Would happily recommend either.
  17. Thread: BMS Confusion

    by Spoonman
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    1,628

    Seconded.

    Seconded.
  18. Thread: BMS Confusion

    by Spoonman
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    1,628

    Yes, I have a Zeva setup in 40 cell flavour here....

    Yes, I have a Zeva setup in 40 cell flavour here.
    Simple and robust once you take the time to wire it up neatly.
    Also I've had email exchange with Ian (Hooper) who's the man behind it and he's...
  19. Thread: BMS Confusion

    by Spoonman
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    1,628

    He's pretty much gone and done it:...

    He's pretty much gone and done it:
    https://openinverter.org/forum/viewtopic.php?f=10&t=577&start=200#p17777
  20. Thread: BMS Confusion

    by Spoonman
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    1,628

    I'd argue that to be proof of sanity. ;)

    I'd argue that to be proof of sanity. ;)
  21. Thread: BMS Confusion

    by Spoonman
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    1,628

    That very much depends on the skills of the...

    That very much depends on the skills of the DIY'er. ;)
    Although tbf you're right, nobody has managed to utilise one yet but it won't take long before that changes
    ...
  22. Thread: BMS Confusion

    by Spoonman
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    1,628

    By that are you referring to the integrated BMS...

    By that are you referring to the integrated BMS in each module reporting to the BUS? (This method isn't uncommon) .. or do you mean that the module based BMS itself uses some for of polling rather...
  23. Thread: BMS Confusion

    by Spoonman
    Replies
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    1,628

    Can you elaborate on this please? ^^^...

    Can you elaborate on this please?





    ^^^
    There aren't any low cost BMS solutions out there worth having in my experience.
    Zeva and Orion are pretty much the baseline.
  24. Acceleration under gravity is certainly a...

    Acceleration under gravity is certainly a constant.
    Accordingly, velocity builds linearly to the point of aerodynamic significance.
    Displacement is a second order function alright, but not either...
  25. oh my goodness that's pretty! :O

    oh my goodness that's pretty! :O
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