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  1. MangDav

    Battery not charging via charger but does via power supply?

    So I have a 36v battery that appeared to be working just fine and has been for the past 2 years. When I plugged it in to the charger which is a 42v 2A, normally it would change from green light to red to indicate charging but at the moment it just flickers between green and red. I measured the...
  2. MangDav

    Series refusing to take any charge. Are the cells damaged?

    I was given a battery that I was told sat for about 4 months without charge, it's a 13s 54v nominal pack. It did not want to take any charge and voltage at the discharge side was 39.8v. I opened it up and started measuring the voltages at the balancing connector, it went; 3.64 7.44 11.24 15.01...
  3. MangDav

    I'm sick of Sabvotons and want to switch to Fardriver. Looking for opinions.

    I'm sick and tired of Sabvoton SVMC72150 and 72200 controllers, I had them catch on fire, FETs shorting with less than 50% rated power, MCUs dying for no reason and so on. I went thru 8 or 9 Sabvotons and want to try something else. Only things I'm looking for is 72v and for it to be able to...
  4. MangDav

    Rear shock setup help on a stealth bomber clone.

    I have a stealth bomber clone that I mainly use for daily street commuting with occasional off roading so my priority is comfortability on the street. I currently have a 200mm DNM RCP-2S with a 550LBS spring. When I was building my bike, I saw that pre-assembled bomber clones typically come with...
  5. MangDav

    QS205 3000w vs QS205 5000w

    It's probably just bad translation, the rep that I was in contact with at NBP was called Raina Yu and her English was fluent even when it came to technical stuff, never had any issues understanding what she was saying. Maybe she doesn't work there anymore or you were unlucky and got someone else...
  6. MangDav

    QS205 3000w vs QS205 5000w

    Maybe NBP has sold clone stuff in the past but few months ago I bought a 273 from them which was verified as authentic by QS plus NBP buys Sabvoton controllers from MQCON in bulk to resell (MQCON is parent company of QS Motors). So it doesn't make sense to me why they would buy Sabvoton...
  7. MangDav

    QS205 3000w vs QS205 5000w

    Are you talking about 205 being a clone or all of their motors? Because I bought a 273 from them in the past, it had a manufacturing defect that prevented me from bolting on a disc rotor, they told me to contact QS which I did, QS asked me for pictures of the motor and they verified it as...
  8. MangDav

    Figuring out max burst current?

    I have a 20s14p made out of Panasonic ncr18650ga cells. The assembler that I bought it from rates it at 150A continuous and 200A burst for 5 seconds. The cell datasheet only shows discharge rates up to 10A which I'm guessing is what the cells are rated for but diving 150 with 14p, I'm getting...
  9. MangDav

    Killed my controller or bms?

    From what I understand, you tried plugging in the alarm unit into the alarm output and the connector shorted? That is really bad luck as the Sabvoton doesn't need the alarm unit to function and most Sabvoton suppliers/dealers don't even include the alarm unit with the controller to begin with so...
  10. MangDav

    Are there differences in the magnets between different KV motors?

    Thanks for the reply. The motor I'm getting says the magnet height is 40mm in the listing and I contacted the supplier where I got my motor from and they said that QS 273 8000w's are 40H but can't confirm the motor that I have. They only sell bicycle versions of QS motors and they commonly come...
  11. MangDav

    Are there differences in the magnets between different KV motors?

    I currently have an QS 273 V3 5T motor and I'm trying to change it to 3.5T. I found one locally but it's just the hub motor without rim. I was thinking about taking out the stator out of that one and putting it inside my hub. They are both the same model, they both visually look the same and...
  12. MangDav

    Working out safe voltage sag.

    I'm planning to add a temp. meter to my handlebars to be able to see motor temp. at all times as my motor already has a built in temp. sensor. While I'm adding a temp. meter, it might not be a bad idea for me to put an amp meter on my handlebars aswell. This is my first 72v build and trying to...
  13. MangDav

    Working out safe voltage sag.

    I'm using an SVMC72150 controller with a UKC1 display, that's how I'm able to get a voltage reading. The DC current setting inside the controller is set to 150A, it's a locked controller so it doesn't let me set it any higher, only lower. I'm not sure how accurate that setting is but the peak...
  14. MangDav

    Working out safe voltage sag.

    I know you should not trust seller claims but the battery is from a reputable seller who provided proof that the cells were brand new not recycled and even provided pictures of the construction which in my opinion is over built with solid copper plates on both sides. I did open the pack myself...
  15. MangDav

    Working out safe voltage sag.

    So I been doing some research and can't find a concrete answer. I'm trying to find if there's a way to work out expected voltage sag of a cell/battery pack. Reason why I'm trying to find this is because I have a 20s14p Panasonic ncr18650ga battery which I use with a 150A Sabvoton controller...
  16. MangDav

    QS 273 V3 only reaching top speed of 35mph.

    So I did few tests and changes today; 1. I held the bike up and full throttled, the speed went past 50 before I couldn't hold it up anymore so it's definitely not display or controller limiting the speed to 40. 2. I peformed a hall angle test. From what I read, you don't need to do it if you're...
  17. MangDav

    Looking for UKC1 display software.

    I use an UKC1 display and the wholesaler that I bought it from set their own custom logo as the boot up screen which I don't care about but they made the background white and it's frustrating when you turn it on it on at night and it just blinds the hell out of you. I seen a youtube video where...
  18. MangDav

    QS 273 V3 only reaching top speed of 35mph.

    19 inch
  19. MangDav

    Can I wire a display to Sabvoton?

    Some controller manufacturers, especially generic Chinese ones, design controllers with displays and then for the non-display ones, they just don't solder the display port and jump the power so the controller permently stays on if it doesn't have "ignition" cable. That seems to be the cheapest...
  20. MangDav

    QS 273 V3 only reaching top speed of 35mph.

    Should I be using the nominal voltage (72) or fully charge voltage (84)? What do you mean by slow? Like overall slow (accelaration and top speed)? It has the correct accelaration if I had to say, it wheelies from a stand still and gets to 40mph in probably under 3 or 4 seconds, not sure if...
  21. MangDav

    No motor power after the bike comes crashing down

    Sounds like a loose connection somewhere. I would go over all the plugs and make sure they are connected properly, I would also go over all the wires to check if they are nicked or are damaged in some way like from rubbing up against a frame piece.
  22. MangDav

    QS 273 V3 only reaching top speed of 35mph.

    I have a QS 273 V3 5T motor paired to a Sabvoton SVMC72150 controller and I can only reach top speed of 35mph, 39mph if I'm tucked. From my research when I was buying this motor, 273 V3 3.5T are rated for 70-75mph and going with 5T, I knew I was going lose some top speed but I though it's going...
  23. MangDav

    Can I wire a display to Sabvoton?

    From my understanding, Sabvoton controllers were originally designed without a display and later on, MQCON released the M variant (I believe H variant aswell) which has a 5 pin display connector, with that being said, my assumption would be that non-display controllers or any other models except...
  24. MangDav

    Battery shutting off at 43v and will not take charge.

    The interconnect seem fine visually, I did charge all series to similar voltages with a bench power supply, recorded the voltages and left the battery to sit for about a week and then I'll re-check the voltages and see if they discharged at similar rate or not. Another theory that I thought of...
  25. MangDav

    Battery shutting off at 43v and will not take charge.

    I didn't take a picture of the back because there's isn't much going on there, it's mainly just traces. There's only seven 205 resistors by the balacing connector and five R003 resistors by battery negetive terminal, nothing that would indicate any sort of major circut.
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