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  1. M

    Mixing chemistries for most economic performance and range

    To bring this down to earth, How about looking at particular combinations of Ping plus A123 cells to see if the parallel combinations makes sense. Suppose you want to minimize the cost and size for a 10 AH 36V LiFePO4 pack, but still want to be able to run at 40 amps continuous, but let's say...
  2. M

    Conect dewalt packs balanc wire under discharge extend life?

    I should also point out that by paralleling cells, the individual cells should last longer because the individual cell charging and discharging current is reduced in proportion to the number of cells put in parallel. If you look at the LiFePO4 specifications (for example the A123 specs), they...
  3. M

    Conect dewalt packs balanc wire under discharge extend life?

    Various people here in the forum have been doing this paralleling of Dewalt packs during discharge for a while. Search Dewalt packs on this forum. I have been running 3 Dewalt Packs in parallel in two sets for a 20s3p pack. They are tied together in parallel permanently via the balancing wires...
  4. M

    Lithium Ion is it the best ?

    You guys forgot to mention that Lifepo4 is the longest lasting of the lithium rechargeable batteries - 2000 or so charges.
  5. M

    The care and feeding of a123-based packs...

    I tested this approach once and it worked fine. The Dewalt Chargers appear to have sufficient isolation from main power. Brian
  6. M

    Parallel balance taps--do they help?

    Yes - Each set of three parallel cells will balance each other during discharge. They will also provide a nice lower impedance, and thus lower sag, pack. Charging them in parallel is also a good idea since it will reduce the charging current/cell and extend the life of the pack. Brian
  7. M

    Where can I buy a battery of 48V 20AH BASED A123?

    As far as I know - They don't exist. You'll have to build your own by taking apart some Dewalt 36V Battery Packs (mostly bought on ebay or from Dewalt Suppliers: see this site for a good deal ($124/pack including shipping)...
  8. M

    Torque arm from ebikes.ca

    Hi Russell - You're right, the setup you now have is much better than a torque washer. Torque washers are worthless - not enough of a lever arm on them to amount to much, and most are too thin - my torque washers ripped out immediately on my rear wheel 406 hub motor. I am now using 4 torque arms...
  9. M

    Torque arm from ebikes.ca

    Russell - This approach looks much better - After reading your previous post, I was going to recommend you doing exactly what you've done. Just an additional recommendation - This setup will be especially fail-safe if you can make sure that no rotation occurs at the joint between the short and...
  10. M

    The care and feeding of a123-based packs...

    To simplify your setup - Couldn't you just directly tie 24 A123's cell by cell in parallel with your 24 10AH Headway cells? If your Headway pack BMS does not provide the short term high current you need, just bypass the BMS controlled output, and use an LVC (possibly the output of your Headway...
  11. M

    Aluminum battery connectors. Headway cells.

    If you don't want to construct your own straps, this site sells pre-drilled copper straps as well as other battery pack building hardware to match the 40138 cells: http://www.rechargeablelithiumpower.com/oscommerce2/catalog/pack-accessories-c-24.html?osCsid=nugq3dkjibhbdqk7ehdelnlph4...
  12. M

    Where to buy BMS or LVC???

    You could try this Australian site for pre-built BMS/LVC boards up to 16 cell: http://www.evpower.com.au/-DIY-Small-LiFePO4-Battery-packs-.html Note that these prices are in Australian dollars - check the current exchange rate - a month ago it was 0.6 of a U.S dollar. I got quick turnaround...
  13. M

    Putting Ping Batteries in Series

    No - for this part, you want to put the + of the battery to pin 2 and then the - of the battery to pin 1 and pin 3 tied together. This puts 2 diodes in parallel with your battery and keeps both diodes reverse-biased (turned off) during normal use - No reason to waste one of the diodes. The...
  14. M

    DeWalt BMSes have changed (for the worse)

    Since you can start it up with another pack, it seems like your new Dewalt BMS is detecting the current surge as the Big Controller Cap charges up - One thing that would be easy to try would be to put a big inductor in line with your Controller Power input - It may slow down the spike in...
  15. M

    Version 2 Crystalyte Controller information

    Thanks Solarbbq3! That clarifies the use of the ABS line for regen braking immensely. Glad you pointed out that the ABS line needs to be grounded on power-up in order to enable the regen braking feature. I would have been stymied. I plan to test this feature just using an ordinary switch, not...
  16. M

    Version 2 Crystalyte Controller information

    Thanks Solarbbq3! That clarifies the use of the ABS line for regen braking immensely. Glad you pointed out that the ABS line needs to be grounded on power-up in order to enable the regen braking feature. I would have been stymied. I plan to test this feature just using an ordinary switch, not...
  17. M

    Version 2 Crystalyte Controller information

    Hi Solarbbq2003 - Do you know if I need to lay off of the throttle before I switch this ABS input to ground to implement the braking effect smoothly? And/Or, will the amount of electronic braking vary with the throttle position, so that if I hit the ABS switch to ground while in full throttle...
  18. M

    Version 2 Crystalyte Controller information

    Hi Solarbbq2003 - Do you know if I need to lay off of the throttle before I switch this ABS input to ground to implement the braking effect smoothly? And/Or, will the amount of electronic braking vary with the throttle position, so that if I hit the ABS switch to ground while in full throttle...
  19. M

    Version 2 Crystalyte Controller information

    Hi Solarbbq2003: I'd like to followup on your comment below about using the abs pin for regen braking: I'd like to make my own regen brake switch, since my existing brakes don't have a cutoff output and I'd rather not switch over to these crystalyte brake levers. This would be a cool way to...
  20. M

    Version 2 Crystalyte Controller information

    Hi Solarbbq2003: I'd like to followup on your comment below about using the abs pin for regen braking: I'd like to make my own regen brake switch, since my existing brakes don't have a cutoff output and I'd rather not switch over to these crystalyte brake levers. This would be a cool way to...
  21. M

    Dewalt 36v Balance lead Plugs.. where to find?

    Hi Steveo, Which connector plug are you looking for? I have a bunch of the 5 pin plugs that match the plug coming out of the battery management system module of the 36V Dewalt Battery. They go directly into the two 5 pin slots of the Dewalt 36V batteries. I would sell them to you for about 50...
  22. M

    Crystalyte 406 Rear Hub Motor With Disk Brake

    Hi Rhubarb, Nice brake setup on your friend's 408. I'm very interested in trying to mount an Avid BB7 on a 406 hub with a 6" disc on my Aerorider. Things are very tight for me as well. Can you take some better close-up pictures of this disc brake mounted on a 408 ? Other angles would also be...
  23. M

    72 volt controller question

    I've got one of the new 7240's from ebikes.ca. It does have 12 FETs in it. To whom it may concern: To get reverse, Justin told me to switch the line labelled DSP to gnd. I have wired mine this way, but have not tested this feature yet. Brian
  24. M

    LM5007MM DC-DC 80 volts step-down converter

    Hi Deejay, The specifications on your DC-DC convertor says that it can only provide 500 mA, which is only a half an amp. It would not be able to drive your motor. The reason that more parallel batteries and Amp Hours translates to better performance with these batteries, is that putting them...
  25. M

    Afterthought Reverse ?

    Hi Guys, I think I've got your answer for you. I have just bought one of the new 72V 40A Crystalyte Controllers from Justin at ebikes.ca. I am putting together a 406 hub for a three wheeled Aerorider and I really need reverse.... This is Justin's response about how to add reverse to this new...
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