• Howdy! we're looking for donations to finish custom knowledgebase software for this forum. Please see our Funding drive thread

Search results

Date Relevance Most replies

  1. M

    here is some info on 20v yardworks lithium ion

    Cool, yes, as long as the LiMn is in good shape... :) (Unlike many of mine.) I finally got around to testing out my 5 TME Xtrema balancers/cell monitors. At 0.1" the pins fit nicely into the BMS cell monitor connector on these YW batts, though I'm not sure the pin thickness is an exact match...
  2. M

    here is some info on 20v yardworks lithium ion

    So I presume you parallel each individual cell ? IE. in addition to the main terminals you run 4 cell paralleling wire runs for each 5s (5 cell) battery ? If so how did you hook to the cells ? I did some cell hookups by various methods in order to bypass bad cells, but it was ad-hoc and wasn't...
  3. M

    here is some info on 20v yardworks lithium ion

    Hi 29a. Heck, I was debating 4 returns vs. 3 returns. Wouldn't even consider 9 in one return. Yeah, I was aware of the cash refund if they aren't stocked. Hadn't thought of return and rebuy to extend warranty though... :mrgreen: One small store in Bells Corners had no battery stock for most of...
  4. M

    here is some info on 20v yardworks lithium ion

    Thanks Takemehome... Hmmm, so do you only switch the + terminal of charger to + of the batts when charging ? I haven't tried a permanent charger hook up yet, but I would have thought that, BMS cut off or not, this would be pretty much equivalent to having the YW batt in a YW charger with the...
  5. M

    here is some info on 20v yardworks lithium ion

    Hey all, long time no post ! :) So did this thread die ? As mentioned in my Arduino Charger/BMS thread I went kinda manic on that project in the late fall, and that contributed to a bout of depression that resulted in my leaving my job on disability, and I wasn't able to get much else done...
  6. M

    Arduino Micro based On-Bike Lithium Charger/BMS/AH meter

    Hi all, long time no post ! :) I've had a few PMs, so here's my 'update' on this and related projects: I went kinda manic on this project in the late fall, and that contributed to a bout of depression that resulted in my leaving my job on disability, and I wasn't able to get much else done...
  7. M

    Arduino Micro based On-Bike Lithium Charger/BMS/AH meter

    With two diodes for each cell connection, either the balancing resistor board (not shown here) or the voltage sensing resistor divider board will be able to tap micro power from the battery pack, or use a separate battery for battery torture or high accuracy testing. With the diodes and a bit...
  8. M

    Arduino Micro based On-Bike Lithium Charger/BMS/AH meter

    To right of PWM chip are 4 TI 74HCT4351E 8 channel analog/digital mux / demuxes with address latches. Primary purpose is the selection of 2 random differential voltages, or 4 single ended voltages simultaneously. Also usable as generic digital I/O. Chips are optional, can use 0-4 depending on...
  9. M

    Arduino Micro based On-Bike Lithium Charger/BMS/AH meter

    Board is modular and split into logical/functional/conceptual blocks that could also be cut into physical blocks to make smaller PCBs. This is not just an ebike or BMS project; The board is a generic I/O expansion device for micros and could be used for data acquisition, N-phase motor control...
  10. M

    Arduino Micro based On-Bike Lithium Charger/BMS/AH meter

    :)
  11. M

    here is some info on 20v yardworks lithium ion

    Status update: - I'm expecting 3 "36v" (actually 33v nominal) refurbished DeWalt packs from Dr Bass soon. They are 2.3 AH each, I guess 123 cells (M1 ?). They are almost exactly the same price per watt hour from the Dr as these YW batts. 3 packs almost (33v, 6.9AH) exactly same price as 2 YW...
  12. M

    here is some info on 20v yardworks lithium ion

    The BMS seems designed for 31 amps, so I'd say these cells are good for 30 amps (5C) without immediate damage. It's up to you how much you want to derate that for the cycle life you desire. My wacker tripped the BMS just once, in VERY deep heavy wet grass (with close to full charge so I don't...
  13. M

    Cross-Canada by Ebike

    :) :) That was my first thought; after I got over the shock of seeing Justin reading the instruction sheet. Once the intelligence gets added to bike (human and multiple controllers, CAs, etc.) perhaps some "Lil Smarty" text should be added.
  14. M

    Cross-Canada by Ebike

    :) :) That was my first thought; after I got over the shock of seeing Justin reading the instruction sheet. Once the intelligence gets added to bike (human and multiple controllers, CAs, etc.) perhaps some "Lil Smarty" text should be added.
  15. M

    Cross-Canada by Ebike

    Yes, maps of charging locations would be very nice, especially when visiting unfamiliar areas. I'm imagining an era of "e-bike wanderers" who travel from place to place depending on whims, needs and season. :) In theory, we could feel better by leaving 10, 20 or 25 cents in an envelope or...
  16. M

    Cross-Canada by Ebike

    Yes, maps of charging locations would be very nice, especially when visiting unfamiliar areas. I'm imagining an era of "e-bike wanderers" who travel from place to place depending on whims, needs and season. :) In theory, we could feel better by leaving 10, 20 or 25 cents in an envelope or...
  17. M

    here is some info on 20v yardworks lithium ion

    Thanks for the report. Yes, of my first 9 batts, only the weed-wacker package batt had the security torx screws. I strongly suspect torx was in the first shipped batts and they later changed their mind about using them. Yes, if your lithium cells are in good shape, they should be reasonably...
  18. M

    here is some info on 20v yardworks lithium ion

    OK, will let you know. I'm very happy with project progress; still on track to have two prototypes built by Halloween. Prototype schematics/layouts/physical design almost completed. Expect prototypes to be about 3.6" x 2.4" x 2" high with a few FETs vertical. Perhaps 1.5" high with FETs bent...
  19. M

    Arduino Micro based On-Bike Lithium Charger/BMS/AH meter

    >My design now is one single Arduino board for each 5 cell battery with a "shield" board containing a small handful of components. In 5s4p I'd only need one of these combos. In 10s or 20s I'd need 2 or 4. I've now switched direction on this one particular issue: voltage monitoring and many...
  20. M

    What would you sell?

    I think most of us self builders balk at the $1350 price for Ezee kit. I was considering one originally; seems nice. Hey, I see ebikes has Nine Continents listed now: http://www.ebikes.ca/store/store_nc.php . Perhaps they would be better than XLyte as components in a "kit" to be sold. What are...
  21. M

    Arduino Micro based On-Bike Lithium Charger/BMS/AH meter

    Clicky isn't gone. It just needs a piezo or a speaker to be reborn. :) I want a speaker of some sort (or siren/really loud device) as a bike bell replacement (required by law, but even my wimpy tiny mechanical bell is OK) that would get the attention of stupid drivers or pedestrians. I want...
  22. M

    Arduino Micro based On-Bike Lithium Charger/BMS/AH meter

    There's an even more active EV BMS project/group at http://autos.groups.yahoo.com/group/EVBMS/ . I probably stumbled across these before and forgot... :) Yes, it would be nice to get some cross-fertilization between groups needing Lithium BMSs. I think some of this, like cell monitoring...
  23. M

    Arduino Micro based On-Bike Lithium Charger/BMS/AH meter

    Well gee, looks like there is already an Open Source BMS project underway: FreeBMS: http://groups.google.com/group/freebms/topics How come nobody told me ? :) I imagine this project will take some time to gel, if it ever does, but looks like a good source for info and debate on components and...
  24. M

    What would you sell?

    Companies with large campuses (esp in warmer climates) may be potential customers for employees who have to maintain things all over. But larger companies might be less likely to deal with a small ebike supplier. Perhaps actual campuses at colleges; I worked at a university once and had to go...
  25. M

    Arduino Micro based On-Bike Lithium Charger/BMS/AH meter

    Yes, it was amusing. :) Shades of the old ASR-33 110 baud teletype I had in my childhood basement... I will take and youtube post some video/audio when I get the chance. I think I'd like to make a PCB with the option of using just a 150 mA photo-relay for outputs, or adding a transistor to the...
Back
Top