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  1. T

    EM3EV charger switch voltage?

    I had the same problem with mine when I received it. I caught it before charging though. I would recommend that everyone check this switch before powering it on.
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    EM3EV charger switch voltage?

    Unfortunately you will need to provide us with more information before we can help you out. How many volts was the battery after charging? How many volts was the battery after the ride? You will need a multimeter to measure the # of volts. -Tim
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    controller screw size -- lost my screws

    I picked up some #4 x 3/8" pan head phillips sheet metal screws at Home Depot. They fit perfectly.
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    HELP!! Tried to connect battery and it sparks

    Did you plug in the pre-charge tail last? The tail has a pre-charge resistor in it that will prevent the flash from occurring. It the tail is plugged in last, then the spark should be avoided or at least minimized.
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    controller screw size -- lost my screws

    So I purchased an ebike second hand at an auction some time back. I took the controller apart to do some recon and I managed to lose the screws that hold the aluminum end caps on. Does some happen to know what size and thread the screws are? This is a typical cheap no-name 12 Fet controller...
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    E bike kit diagnostics

    I should have stated this earlier. The readings should be taken when the battery is not connected to the charger. Was the charger on when the readings were taken?
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    E bike kit diagnostics

    That reading does not make sense. I believe you are taking readings between the wrong pins. All of your readings for individual cells should be between 0 and 3.8v Does your BMS connection look like this? this picture was taken from the manual on...
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    E bike kit diagnostics

    Take a reading from pin 15 and the red wire, I believe that is the 16th cell.
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    Vpower / CamyCC Battery LifePo4 48v20ah rebuild

    I wanted to post an updated to close out this thread. I ended up giving up on rebuilding the pack. Many of the cells would not hold their voltage and would continue to drop. In additional to the voltage drop I noticed that some of the cells were off gassing a strange odor. I did not want to...
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    Recommendations for a BMX hub build?

    In your spreadsheet you list the wheel diameter as 26", but in the simulator you have it as 20".
  11. T

    shopping list for battery build

    This is a critical point to consider. The discharge rating will impact your overall usable capacity. .5 * 9Ah = 4.5Ah usable
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    Triangle battery bag

    I thought the same thing when I recently purchased a bag from them. They seem reluctant to accept paypal. I sent in the money order and received the bag the next week. It reminded me of my first eBay purchase back in the 90's. They responded to emails in a prompt fashion and notified me when...
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    Vpower / CamyCC Battery LifePo4 48v20ah rebuild

    My original pack had 18 cells in series. I should be able to reconfigure the good cells into 16s14p configuration. At 1.1Ah per/cell, this will be ~15.4Ah . Actual capacity will be less due to the cells being used. I went ahead and purchased some Belden tinned copper tubular braid/ground...
  14. T

    Vpower / CamyCC Battery LifePo4 48v20ah rebuild

    I cut out the bad strings. Now I am charging up the good strings. This is taking forever without a single cell lifepo4 charger with hvc due to the manual monitoring and my paranoia of overcharging. I have a charger on order, just waiting for delivery. In parallel I'm modeling different pack...
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    Homemade Battery Packs

    What sizes of copper braid are you using for the connections?
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    Vpower / CamyCC Battery LifePo4 48v20ah rebuild

    The bms is not connected at this point. So the fault is definitely in the battery. Is there a way to test the bms without having all of strings functional/present? If I cut out the bad strings and make this pack 12s I assume I add another new 4s pack in series to have a functional 16s pack...
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    Vpower / CamyCC Battery LifePo4 48v20ah rebuild

    Here is an update on the battery pack. Strings 3, 9 and 15 will not hold a charge. The voltage drops off very quickly after removing the charger. I'm guessing there is an internal short in these strings. The rest of the strings are all at approximately 3.25v and are holding the partial...
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    Vpower / CamyCC Battery LifePo4 48v20ah rebuild

    Thanks for the clarification. I hooked everything up with alligator clips and moved the charging/monitoring setup to string 6. The voltage is now 3.07v @ .88A (1.878v prior to charging). What should I expect to see with respect to the current measurements as I approach 3.4v?
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    Vpower / CamyCC Battery LifePo4 48v20ah rebuild

    Amberwolf - Your http://www.endless-sphere.com/forums/viewtopic.php?f=14&t=22750&start=0 thread was my inspiration for even considering tackling this project. Right now I have a cell phone charger (5v 800mA) hooked up to string 2 to see if I can get it to charge up. The charger leads are being...
  20. T

    Vpower / CamyCC Battery LifePo4 48v20ah rebuild

    I managed to get the battery fully unwrapped tonight. My original voltage readings were verified on the cells themselves, so this does not appear to be a faulty sense wire. Here is picture of the battery unwrapped and filleted open. I started to take voltage measurements when charging, then...
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    Vpower / CamyCC Battery LifePo4 48v20ah rebuild

    Thanks for the replies. I'm thinking breaking the pack down into a usable Ahr size is the best approach, limiting my investment in time and $$. This battery is of unknown condition, I assume it has been sitting discharged for quite some time. One of the end cells was dented/crushed at the...
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    Vpower / CamyCC Battery LifePo4 48v20ah rebuild

    EDIT: I gave up on this repair, but wanted to add additional info on the BMS pin out in case someone else needs it. I picked up my first eBike at a local auction this week. I got it for a steal, but the downside is the battery pack will not charge over 40.8V. The pack is one of those duct...
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    My first ebike

    This thread should be moved to "E-Bike Non-hub Motor Drives". I believe there are other bafang owners that have experienced similar problems. You might want to change the title to "Bafang crank drive throttle problem"
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    Ch00paKabrA Second Build

    How did you wire the Bosch batteries up? They have that strange connector interface on them.
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