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  1. brownj24

    pls HELP - only 2 cell groups charging, BMS showing 0 wire resistance

    Hello, I built at 21s34p battery for my Bullitt cargo bike front bay area. Yeah, it's big! Sadly, after only 24 cycles, my chargers were shut off by the BMS with the following error (see pic). 2 of the 21 strings show a little over 4.2v full charge, but all the other cells stayed around 3.7...
  2. brownj24

    48V DC bus bars for use on 72V system - is it ok?

    I am trying to find a pair of bus bars to connect to my 72v battery +/- leads. My battery is 20s28p (72v with max continuous current draw of 80 amps). It seems everything I can find is rated to max 48V for DC. I assume just for safety around arcing? Can I still use something like the below...
  3. brownj24

    How to find capacitance value of ebike controller?

    I am trying to design a pre-charge circuit to eliminate arcing from my 72v battery to my Grin Phaserunner controller when plugging in. Does anyone know how to find the capacitance (uf) of the Grin Phaserunner so I can determine what size resistor I need? I can't find anything in the manual or on...
  4. brownj24

    Nickel Strip placement for complex shape pack

    required info: 20S13P pack Samsung 35E cells, rated at 8 amp continuous Maximum peak current will be limited to 50A, max continuous 40A (so under 0.5C discharge rate) I've laid out my battery to maximize the space in my mountain bike frame. This has caused some odd and inconsistent shapes...
  5. brownj24

    Optimal current limit for a given continuous discharge rating?

    Does drawing 25 amps vs 35 amps from the battery controller on a 72 volt, 40 amp continuous discharge-rated lithium battery prolong battery life? Is there any reason to stay below 25 amps on a 40 amp rated battery? I ask because my Phaserunner controller came programmed with 25 amp limit from...
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