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  1. E

    Learning about BMS

    Lately I've been considering getting another G1 Honda Insight. The team over at Insight Central have built a very robust system that supports complete manual hybrid system control and comes pre-programmed to work with a few commonly found batteries, ranging from a like-for-like lithium...
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    Learning about BMS

    Hi all, I'd like to begin educating myself on battery management systems, particularly how LiPo packs are monitored and balanced. Can anyone recommend some resources? Looking at a few preassembled packs, it appears they typically have a single monitoring wire from each cell in series. From...
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    Which battery chemistry for extreme climates?

    Any suggestions on a source for LTO cells?
  4. E

    Which battery chemistry for extreme climates?

    Advantage of the system as I have it set up: Anyone can sit in the car, turn the key and drive away without having to know anything about the car. I also don't lose my radio presets if I leave the car sitting for more than a few days. If I were the only person who ever used my car I might...
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    Which battery chemistry for extreme climates?

    I measured the parasitic draw in my car and figured that with the caps' natural self-discharge and the small current to keep the radio presets and other little bits going in the car, 6x3000F caps (which are equal to one higher voltage 500F cap when in series) will not quite last a weekend. That...
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    Which battery chemistry for extreme climates?

    Been a while since I looked at this post, but somewhat unrelated to my original question, I decided to ditch my car's 12v battery when it passed away early this winter, and instead moved to a bank of supercapacitors and a LiFePO4 battery to extend standby time. Setup is this...
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    Which battery chemistry for extreme climates?

    I'm mostly concerned about charging during these temps. Will check out A123's though.
  8. E

    Which battery chemistry for extreme climates?

    This is an automotive application. Non-removable, otherwise temperature wouldn't concern me.
  9. E

    Which battery chemistry for extreme climates?

    Thanks. I understand most EVs have heating elements in the batteries which turn on in northern climates? What do those EVs do that don't have heating elements? Do you just not get any regen until the battery warms up? Can you not charge them at all?
  10. E

    Which battery chemistry for extreme climates?

    Hi all, I'm trying to determine which battery chemistries would be safe for year-round use in Vermont. We get temperatures here as low as -40c occasionally, and there are typically several weeks each year where the daily high temperature is below -20c (approx 0f). My understanding is that most...
  11. E

    2000 Honda Insight: Convert, or No?

    Going to subscribe to this thread, since I'm an Insight owner as well and have been playing for BEV conversion ideas for years. I'm waiting on something major to go out in it to have the excuse, but 250k miles later it still has had only oil changes, tires, one 12v battery and some balancing...
  12. E

    Would a wind powered car work?

    To rephrase what others have said, your grille + pinwheels + generator will add drag to your low-cd vehicle. Windmills generate energy by creating drag. You will always have more drag added than the energy created.
  13. E

    Reliable 4 season car replacement practicalities

    I built a full velomobile "fairing" around my recumbent trike with brake lights, turn signals and (not in the picture below) running lights and a great headlight. It tops out around 45mph and will go 50-60 miles on a charge in good weather without pedaling. Some thoughts: The velo shell keeps...
  14. E

    Advise on First ebike build

    I'd get the size that fits your bike. With a given motor winding, a smaller wheel will have a lower top speed but better acceleration. Most direct drive motors I believe will be more efficient with a smaller wheel, because they can run at higher RPM, but it's not like you can run a 20 inch...
  15. E

    Advise on First ebike build

    I'm far from an expert, but here are some thing's I've gathered: Geared hub motors have moving parts which can fail, and no regenerative braking unless the clutch seizes up. They tend to be more powerful for their size and weight, or lighter and smaller for the same power. If you're frequently...
  16. E

    Madness. Why such slow penetration for hybrid?

    Glad you cleaned it up, thanks. Thinking out loud here, one reason for limited adoption may have been price for lithium batteries? My limited knowledge on the topic suggests that NiMH, which was preferred until maybe 2011, can take high charge currents but has a whole host of other issues (self...
  17. E

    Leaf / leafmotor / leafbike high efficiency 1500w motor

    It appears to not be specified when ordering an already-built wheel, so I guess I'll reach out via email.
  18. E

    Leaf / leafmotor / leafbike high efficiency 1500w motor

    My apologies, I saw a post ealier in the thread which mentioned they had a "freewheeling cassette", and thought to ask about it. It appeared they were shipping retrofits for putting cassettes onto older cassette-less motors? Cassette is definitely preferable. I'll make sure to clarify. Seems to...
  19. E

    Leaf / leafmotor / leafbike high efficiency 1500w motor

    If I wanted to achieve ~45mph @ 72v nominal with a 20 inch rim, that would be approximately 730RPM loaded, right? What would that be, 4T? EDIT: This is a big thread to read, but what do I need to do to make sure I get a version which can take a freewheel cassette?
  20. E

    MAC + Phaserunner + CA3, sometimes doesn't start

    I had some exchanges with Justin, and tried some of his suggestions, none of which seemed to help. Given that I almost never pedal the trike (speeds too high) I think I'm going to put a large DD motor on (more reliable at these power levels, regen) and pair the MAC with a lower powered ebike.
  21. E

    MAC + Phaserunner + CA3, sometimes doesn't start

    Nothing I can do about it? Mine is set to feed it up to 96 amps / 3000w, and up to 50 from the battery. From a stop on a steep incline I find myself struggling to get my relatively heavy velomobile moving forward.
  22. E

    MAC + Phaserunner + CA3, sometimes doesn't start

    So, it's running well in a vast majority of conditions after extensive tuning, but I still have really "soft" starts when using Hall sensor start. That is, unless I get moving under pedal power, it generally can't get itself moving with my weight on the trike. Once it's rolling forward even...
  23. E

    MAC + Phaserunner + CA3, sometimes doesn't start

    Sorry for the slow response! Holidays, then a failed Cycle Analyst and a week's worth of troulbeshooting for GRIN. In the intervening time we've had a warm, dry spell (the snow all melted and it hasn't rained), so it'll likely be a week or two minimum before I can test whether that parameter...
  24. E

    MAC + Phaserunner + CA3, sometimes doesn't start

    Maybe this isn't an issue on a bicycle, but I frequently ride my trike in wet/frozen conditions, with 2-3000w to the rear, which is relatively light. Going over ice will cause it to slip. Even riding over white paint on roads when wet will often cause the rear wheel to slip, and RPM to rapidly...
  25. E

    MAC + Phaserunner + CA3, sometimes doesn't start

    Finally got my corovelo put together, and I'm working on getting my phaserunner and CA3 tuned/programmed. Before you ask, I searched pretty extensively and wasn't able to find what I was looking for. With the rear wheel lifted off the ground (no load), it seems to respond to throttle exactly as...
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