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  1. bike4life

    single phase induction motor hums and does not start when shaft is spun.

    > The motor hums. > The shaft is free and not clogged. > I spin the motor by hand and by drill so even if the start winding is bad it should still spin up.... > Despite that, the motor continues to hum and does not start spinning. please help thx.
  2. bike4life

    SMPS for charging circuit readings wrong?

    i purchased a 1000W SMPS 120v AC --> 36V DC supply. This is for charging my ebike. I wired it up against the battery for charging and the following readings are done with a ac/dc clamp meter. I am measuring 12 amps on the input and 27 amps on the output. 12 x 120 = 1440w. 36 x 27 = 1000w...
  3. bike4life

    ok folks here is the hybrid ebike.

    I forget if i alluded earlier but the reason for this is i want like 200 mile range ebike at 25+mph, which is not possible without a generator. also, a engine powered bike is illegal in my state so i had to make a hybrid. https://www.youtube.com/watch?v=Pb-GJbPhIl4 its a little slow at 25mph...
  4. bike4life

    is series 2x switchingmode power supplies safe for charging at 1C

    i have a 36v 1000w supply i would like to series with another 36v 1000w supply of the same model to yeild 72v 2000w... anything i should know. does series SMPS work that well and wont damage the supplies that much. thx
  5. bike4life

    float charging lifepo4

    i have a trailer with a generator attached to the ebike. the trailer is attached to bike seatpost the 2000w generator powers a 1000w switching supply and 1500w boost converter which can be adjusted to make any arbitrary DC voltage. i plan on having an infinitr range ebike / gas hybrid ebike...
  6. bike4life

    full charge voltage for a123.

    by bike4life » Jul 16 2021 8:19pm running / full charge voltage for a123 cell...\ I have an 8p, 12s, a123 22650 / lifepo4 pack running my ebike. I am charging it via a switchmode supply (36v DC, 30A) hooked up to a boost converter which steps it up to 43.2V (3.6v per cell x 12 = 43.2). This...
  7. bike4life

    full charge voltage for a123.

    running / full charge voltage for a123 cell...\ I have an 8p, 12s, a123 22650 / lifepo4 pack running my ebike. I am charging it via a switchmode supply (36v DC, 30A) hooked up to a boost converter which steps it up to 43.2V (3.6v per cell x 12 = 43.2). This allows me currently due to the...
  8. bike4life

    switchmode power supply trips when trying to charge ebike battery

    I have a 12s a123 cell / lifepo4 battery pack. they suggest 3.6 volts per cell charging. here is the data sheet: https://www.batteryspace.com/prod-specs/6610.pdf I am feeding it 42.2 volts from the switching supply to the battery and however when i plug the switch mode supply in to the battery...
  9. bike4life

    96v at 19 amps vs 72v at 25 amps EBIKE!

    Hello, I am running an ebike off an 1800w running watt inverter gen on a trailer... I am planning on DC conversion for the motor to be done through.... It needs to be generator powered as the ebike will be doing 100-200 mile trips, which batteries cant do. A) 2 1000w, 48V DC PSU in series...
  10. bike4life

    Can I charge my ebike in parallel...

    So currently me ebike has 2 of these a123 lifepo4 packs... See one on each side of the bike... I basically take each battery out of the bike and chargew them individually... They pop off easily... Currently, I've been hookiing the balance leads to each of the 12 terminals basically with...
  11. bike4life

    slow ebike... 80 volts ebike going 30mph? why so slow

    hello... I bought a 48v / 72 volt controller from china... link to controller http://ebay.to/2Jl7HS4 I have a hub motor wheel, those 1000 watt 48 v wheel kits... I have a lifepo4 battery a123 cells from batteryhookup i bought and they are 2 x 12 series = 24 series. I had them at 79 volts or...
  12. bike4life

    Help with new 47/72 volt chinese controller

    I cant seem to get my controll to work.... I gave it 80v from the batteries to the + and - leads... I hooked up the phase wires from the motor to controller and matched the colors... The hall effect wire connector from the motor fit into the female coonnector on the controller perfectly and...
  13. bike4life

    Problem with charging lifepo4 with server psu

    I have 4 server psu that i arranged in series and combined the outputs. They each make 12v x 4 = 48v total. I took a kiln wire and clamped the 48v + and - and the kiln wire had 5 amps running through them (DC clamp meter). The psu have a indicator light at the end and it was green. Now when i...
  14. bike4life

    will a 48v ebike throttle work on a 72v system.

    title... i cant find a 72 3 wire throttle, so i bought a 48v one.
  15. bike4life

    Ebike not working motor cuts out...

    So I have a battery from china... regular 48v 13 series 4 parrell... 18650. When ever I even go more than 5 mph, the motor cuts out... After like 10 seconds of riding... Then What I have to do is unplug the battery and plug it back in and then it works. Then 10 seconds later cuts out. plug...
  16. bike4life

    Question on charging ebikes with server psu

    Ok so i have purchased 4, 12 volt server power supplys at 10 dollars each.... Now I have a 12s lifepo4 battery pack. lifepo4 reccomends 3.8 volts per cell x 12 = 45.5 volts.... Now problem is my 4 x 12 volt server psu in series makes around 50 volts.... Can I charge my lifepo4 batteries with...
  17. bike4life

    Is this a lie?! False Avertising

    On ebay, it is advertised a 48v 36ah lithium cell for only 170 bucks... Is this a lie?! I dont understand how 1500 watts can fit in such a small size of 240mm x 66mm x 60mm in the description which is around 9.5" x 2.5" x 2.5"...
  18. bike4life

    Jump start e bike??

    Going up a steep hill, at 25mph, the ebike cut off, b/c presumably the voltage drop was too much and protection circuit came in. However, when that happened, i heard a slight pop sound! I stopped the bike and it did not work at all.... Failed to restart.... Walked the bike back home and measured...
  19. bike4life

    Controller Wiring Help

    Ok so i am thinking about ordering this controller cause my old one does not seem to work... I am installing this on a voliamart kit...
  20. bike4life

    Fried charge Connector and dead controller?

    E bike Battery Charge Port Fried???? Is this normal.... What happened was while the 48v 20ah battery was plugged into the controller, the charge plug touched the controller's aluminum housing directly, and then black smoke and the burnt plug remains..... Battery Seems Ok: tested with...
  21. bike4life

    INCREASE EBIKE SPEED WITH DC BOOST CONVERTER

    How about instead of adding more cells, we just buy a 1800W boost converter. A boost converter is basically a transformer for DC power...... That is adjustable to a fixed output voltage. Plan on using one of these boys to step up my 48v 20ah battery to 72v.... Like here...
  22. bike4life

    Charger Dead, BMS fried??

    Ok so i went out for a run and decided to charge my 48 battery.... Right now with the battery charger, when i plug it into the wall, I get no led, nothing.... When i plug it into the bike, then I get a green led, despite the fact that the battery is 47v.... Does this mean the charger is dead? I...
  23. bike4life

    Ebike Speed Reduced????

    When i currently made my 1500w ebike, it reach top speeds of 35 mph on flats easy... After a while, about 2 weeks, i flipped the bike upside down for maintenance and slightly damaged the twist throttle handle, i took it for a test that day and it only does 30 MPH. Subsequent tests reveal a top...
  24. bike4life

    How to charge electric vehicle batteries..

    Thinking of buying one of these: https://batteryhookup.com/collections/module-madness/products/bmw-oem-16s-57-6v-35ah-2kwh-module What charger should I use??? Since its a 57v base, 66v fully charged, which is not a regular 48v, 72v, etc.... Or can i just use a variable power supply to do it...
  25. bike4life

    2 lithium ion batteries in series...

    https://www.ebay.com/itm/36V-20AH-Li-ion-Battery-Volt-Rechargeable-Bicycle-1000W-E-Bike-Electric-Li-ion/274134211710?hash=item3fd3ac1c7e:g:NQwAAOSwe-td7cdh Can i add 2 of these lithium batteries in series, to get 72 volts... Each of these batteries has a BMS, but would i need a bms thing for...
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