Search results

Date Relevance Most replies

  1. A

    Bottlebox battery case ? without battery

    Hi, I'm looking for a case/box to fix in the water bottle screws but I didn't find any. I made my own battery and I can make a new battery then I don't wanna buy a battery. 52 or 65cells. Where can I buy these for cheap ? (100$ the case... no) Should I make my own case ? Thank you !
  2. A

    Programming the Bafang Middrive BBS01+BBS02

    Hi guys ! I really dislike the PAS and I would like to remove the display by using a small wire in order to short PL and P+. For now, when I turned on, the level 1 is set by default.(means with PAS) How to program the bbs02 in order to set the level0 (without PAS, only throttle) Thank you !
  3. A

    BBS02 Chainring 52T cheapest one ?

    haha ok, actually I bought a 48T and 52T. I think it's the same problem than the guy who stays at 5th speed/gear all ride even for starting. I have a temp sensor in the motor and I have a hall sensor on one phase. I'll make my test.
  4. A

    BBS02 Chainring 52T cheapest one ?

    omg ! No I measured, it should be ok lol People really did this ?!
  5. A

    BBS02 Chainring 52T cheapest one ?

    What ? lol of course Ill need to change the chain. I didnt understand the thing with the hammer lol ?!
  6. A

    BBS02 Chainring 52T cheapest one ?

    I just wanted to not be stopped at 40-45km/h with my mountain bike (because of the gears). I'd like to go fast to 50-60km/h for some meters when I go to a road with cars (ok you maybe dont see what I mean) Thank you, indeed, i bought on em3ev since I didnt find cheaper. (it's more the shipping...
  7. A

    BBS02 Chainring 52T cheapest one ?

    I think also we'll stop here, we are talking totally different situations. AND it wasnt my question at all. (I wonder who are trolling)
  8. A

    BBS02 Chainring 52T cheapest one ?

    Then you said the motor in load even small cannot go faster than 85% of his max speed ? First time I hear this... Please proof. When I tried, I see this : Which confirms what I said. Where do you see the efficiency is a bit different ? I don't see any difference. In "chart options", you can...
  9. A

    BBS02 Chainring 52T cheapest one ?

    I think I'll stop here, I don't want to copy paste what I said. 2) "almost at full rpm", 97% is almost, 85% is far. Now the motor's efficiency depends on the load :| 3) No one knows when the controller stop the motor, for me it's maximum speed. A bigger reduction will run better for a high...
  10. A

    BBS02 Chainring 52T cheapest one ?

    Show me an efficiency curve with peak at max speed :O Even if it doesn't decrease like an ICE motor, it still decreases. Are you serious ?! You don't care about mathematics but the website you just sent me is FULL ONLY MATHEMATICS since it's a SIMULATOR. You are talking about real values...
  11. A

    BBS02 Chainring 52T cheapest one ?

    Of course it's different but it's still true. It was a rhetoric question... :/ everybody learned this equation at high school :/ but we don't care at all the motor will push harder (ie torque), I just see the consumed power. I'm waiting for your explanation about the "absolutely false". What...
  12. A

    BBS02 Chainring 52T cheapest one ?

    Please give me the graph of the motor's power. I didn't find it. BBS02 48V 750W. Or you just guess that it's pretty similar ?
  13. A

    Back bag for bike ?

    It's too big for me, I'm looking for a small bag I could remove quickly. Today I was riding the bike as usual and I climbed a small sidewalk and boum, no battery anymore : Really bad quality and no wonder this got broken ... I'll try to solder it to make it more stable and stronger !
  14. A

    BBS02 Chainring 52T cheapest one ?

    Yes, I didn't read myself but I could have written more understandable xD It wasn't clear at all. Haha good movie ! Even if you can see only barely Tokyo.
  15. A

    BBS02 Chainring 52T cheapest one ?

    Mmmmh thank you for reply me but are you sure you studied electricity/electronic/physic ? At 45km/h with 52T or 44T, the load is same... omg the load doesn't depends on the chainring..... the load depends on air, level of the road and weight on the bike, means speed and your weight. Load =...
  16. A

    Voltage dropped after charging ? New battery pack.

    Ok, I'll try to make the measurement of each cells during the charge and I'll post here.
  17. A

    Voltage dropped after charging ? New battery pack.

    Hi ! Still a problem (maybe). Now with my battery pack (10 cycles maybe) the charger go to 54.6V (4.2V) and then the BMS cut off the power (cause one parallel cells went to 4.2v). In 2sec, the battery pack voltage decreased to 53.8V and in 5min, 53.6V. I lost 1V in 5min :O Did I get very bad...
  18. A

    Back bag for bike ?

    Mmmmh lol I'd like something which looks better ^^ And if you take only the metal box with bags, they should be heavy themselves. lol My bag is really really light (than expected).
  19. A

    BBS02 Chainring 52T cheapest one ?

    Mmmmh it's opposite way.. since the energy efficiency decreases with motor speed, for the same speed, I will use less battery power... (for same load between both chainrings then for the same output speed) If I decrease the chainring, I'll get more torque (still at the same output speed) since...
  20. A

    Back bag for bike ?

    yes indeed ... but I ride in downtown (Tokyo :/), I take a Chinese mountain bike for the price and suspended for the comfort... really appreciate at 40km/h. Anyway yes need to be strong :/
  21. A

    Back bag for bike ?

    Hi, I rode with this bag now for 3months and sometimes with the charger inside (13s4p + charger) it's pretty heavy... I need to stand back up the frame because it almost touched the wheel :/ And now, (as I could expect) the solder got broken. (it was a shitty soldering) I need to find a welding...
  22. A

    BBS02 Chainring 52T cheapest one ?

    Hi, For now, I can go as fast as 45km/h with my Chinese mountain bike with the stock bafang chainring. Then I use a lot the battery when I'm at this speed. I would like to change it for a 52T in order to reduce the speed and then consume less and go faster. The cheapest I found is EM3ev here ...
  23. A

    Voltage dropped after charging ? New battery pack.

    Ok I maybe misunderstood what you said before. No relocating, my battery pack is in the bag behind and it wont be anywhere else. The bag is big enough to bring the battery and the charger (when I don't come back). Anywhere, I will solder them soon.
  24. A

    Voltage dropped after charging ? New battery pack.

    Ok haha, mmmh it will be more complicated to make a new small pack because of the bms and as you said small wires. I will solder directly to the main battery pack. Unfortunately, I cannot use 7p because of the size of my bag... but I can easily go to 6p :lol:
  25. A

    Voltage dropped after charging ? New battery pack.

    Of course, not mine haha but I'm working in an electronic laboratory. Do you think I could add a 1p to my battery pack ? I didn't succeed to sell my left 52cells then instead of let them in their box, I'd like to improve the pack. My battery pack has maybe only 5-6 cycles. I'd like to convert...
Back
Top