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  1. vreppeto

    (Has been given away) Broken TSDZ2 FREE (Preferred pickup in Brooklyn please)

    I will take it. I live in Salem, Or 97305 . shipping looks like 25 or 30$ ups ground. Which kit? How many watts?
  2. vreppeto

    3rd party programming software for ev rider stand n ride controller

    I'm sorry says my controller is not the same. The programming cable will only work with Pei scooter controllers. He told me to cancel the order so I did
  3. vreppeto

    3rd party programming software for ev rider stand n ride controller

    There is no info on this scooter. Tracking this stuff down has been difficult so I hope this will help some people that are looking for info.
  4. vreppeto

    3rd party programming software for ev rider stand n ride controller

    So I found this controller when I went to replace the one in my ev standnride. PEI Scooter sells it here...
  5. vreppeto

    Step up DC-DC charger repair

    According this guy https://github.com/delboy711/BST900 the bst900w uses a ucc3803 pwm controller. I think I will try the serial connection on the dpx800s to see if I can query the controller. here is a forum for the bst-900w on eevblog...
  6. vreppeto

    Step up DC-DC charger repair

    I bought two of dpx800s from drok on amazon. Both of them failed almost immediately. They both overheated due to a failure of the fan. The mosfet controlling the fan is hiding under the cooling fan next to fan power plug. It is labeled d4184. This appears to be a 40v mosfet. The mosfet that...
  7. vreppeto

    A123 Cells from jag35.com

    the link may not be valid any longer but it is " https://jag35.com/collections/lithium-batteries/products/12v-a123-nec-alm12v7-ups-battery-modules " as of 6/12/22 . When you click purchase it leads to an entirely different product at batteryclearinghouse.com "...
  8. vreppeto

    New "TSDZ2 Torque Sensor Central Motor"

    I have been looking at lubricants for the blue gear. The molykote em-50L appears to be a PAO lubricant with lithium thickeners and a molybdenum additive. It seems to be a unique blend. Here is a decent article on lubricant selection...
  9. vreppeto

    What battery to choose after your last one burned your house.

    Someone said something about A123 lifepo4 being extremely volatile so it is not always true but the liitokala 32700 lifepo4 cells seem to be pretty safe. I was charging 16s2p in a honeycombed pack with hot glue and shrink tape. The analog balance board failed and I was sitting right next to it...
  10. vreppeto

    What battery to choose after your last one burned your house.

    No judgement from me. I am grateful you are willing to share these details to save me from a similar fate. So can I assume one of the takeaways here is that redundancy is key in development of a safe charging protocol? I am thinking a smart bms and a smart balance board so either can stop the...
  11. vreppeto

    Active energy transfer balancing

    I know it seems okay to you to high jack someone else's thread for such an argument but it's not. If you want to argue about it start another thread. I imagine if you mention my name I will be notified. If you do then anyone who cares to join in the milieu is welcome. If you choose to do so...
  12. vreppeto

    Active energy transfer balancing

    Did you find this site yet? https://jkbms.com or this one? http://www.enjpower.com/
  13. vreppeto

    Active energy transfer balancing

    Not very convincing. https://www.youtube.com/watch?v=Qzt9RZ0FQyM
  14. vreppeto

    Active energy transfer balancing

    .............................................................
  15. vreppeto

    Active energy transfer balancing

    I use a cc/cv power source for charging. In order to charge my cells I set the OCV and the current limit of the power supply then hit start. Because of resistance I have to set the OCV at 5v in order for the cells to charge at 3.65v. As soon as the charge voltage goes to 3.7v I lower the OCV...
  16. vreppeto

    Active energy transfer balancing

    This is all news to me. The date on the article is July 2019. What is your source? "unquenchable fireball", with lfp at 4.2v !!?? "You are wrong and I am right" is not an argument that carries much weight.
  17. vreppeto

    Active energy transfer balancing

    Me too. For now. I do this with LFP cells since they tolerate overcharge to 4.2v before beginning to break down. (battery university) I don't try to charge more than 8 cells at a time until I get to know the pack. Start at 27.35 volts. When current drops to <100mv or so then I check again...
  18. vreppeto

    Active energy transfer balancing

    I agree. But it's the only thing I could afford that does Broadband balancing instead of cell-to-adjacent-cell. I wanted to start cheap until I can figure out which ones are really worth spending money on. These caps are definitely junk. I just bought a whole new set to replace them with after...
  19. vreppeto

    Active energy transfer balancing

    I have a 16s version of this balancer. I had it working nicely. It balanced a 16s lifepo 10ah pack in just a few hours. The eng jumper on the board is for a sleep switch in the open position. The instructions seem to indicate this should be open when initially connecting the battery pack...
  20. vreppeto

    Safe to add balance board to bms regulated battery pack?

    I have one of the 5.5a capacitive balance boards https://www.aliexpress.com/item/1A-3A-5A-6A-Balance-Li-ion-Lifepo4-LTO-Lithium-Battery-Active-Equalizer-Balancer-Board-Capacitor/4000241881122.html?spm=a2g0s.9042311.0.0.27424c4do16ZHS. I m wondering if it is safe to run it in parallel with a...
  21. vreppeto

    How safe is adding an active balancing board?

    I have one of the 5.5a capacitive balance boards https://www.aliexpress.com/item/1A-3A-5A-6A-Balance-Li-ion-Lifepo4-LTO-Lithium-Battery-Active-Equalizer-Balancer-Board-Capacitor/4000241881122.html?spm=a2g0s.9042311.0.0.27424c4do16ZHS. I m wondering if it is safe to run it in parallel with a...
  22. vreppeto

    Boat battery egine starter

    A cheap 40 amp bluetooth bms could work. Run the output of the bms to the ignition switch and/or the main fuse terminal. Run the signal line from the ignition to the starter relay coil. Bypass the bms for the main battery cable and run it directly to the contact on the starter relay. This...
  23. vreppeto

    Boat battery egine starter

    I would build the pack with nickel fuses for each cell. If a cell goes bad the fuse will burn and drop that cell from the pack. In addition to over building the pack this would make it pretty safe. Strip the insulation from a battery cable and solder it all along it's length to the nickel...
  24. vreppeto

    Full suspension mountain bike Friction Drive

    I am considering the possibility of gear reduction for a setup similar to yours. I need 5500 to 7000 rpms on my 1996 EV Warrior in order to do about 30kph. These stock brushed motors do this on 24v. According to the following document they are rated at 229kv...
  25. vreppeto

    Full suspension mountain bike Friction Drive

    That's true! If we think about two gears separated by an idler then the size of the idler gear has no bearing to the the final gear ratio. The back wheel is just an idler gear between the motor and the road. I was not thinking of it that way until I read this. Peace, Ifishtoo
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