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  1. X

    Strange behaviour of BMS cell voltages

    I have seen this exact behavior in my own diy battery. The reason was "weak" contacts between battery terminals and BMS-voltage-sense-wires. In a way it acted as a high resistance connection... With no current across the cell (positive or negative) the reading was fine. Fluctuating by a...
  2. X

    Open question - 400V charge controller?

    not sure about availabilty where you live, but i am looking (for my purposes) at this combined "mppt-charger + three-phase invertor" SOLAX THREE PHASE HYRBID - HIGH VOLTAGE Battery voltage range [V] 160-800 Max.continuous charge/discharge current [A] 25...
  3. X

    QS273 Re-Winding, Looking for someone in UK

    which requires complete rework of the hardware, splitting the battery and making new connections between new parallel groups, new bms to handle fewer S groups, new twice as thick wiring harness, new controller to handle less voltage and more amps... i get the feeling that this is exactly what...
  4. X

    Adding an additional rack battery to a full suspension ebike

    Options are many, but depend on how much battery you wish to add, and how awful-looking bike you are willing to accept. seatpost rack...
  5. X

    Ghetto "HF start" on MMA welder?

    Well im glad i googled that before replying, at first i thought you really disliked my choice of welding method hahaha. Nice to see im not the first one to think of this solution. @stan.distortion Thanks for bringing this to my attention. Feeding high voltage across a spark gap of RLC...
  6. X

    Ghetto "HF start" on MMA welder?

    Wall of text ahead, please bear with me as i explain. I am very much a noob with welding, and i have an old transformer stick welder with bad characteristics. Electrode sticks down rather than igniting the arc. Very difficult to start. Low-ish current welding is essentialy impossible. But once...
  7. X

    Oil cooling a motor with transformer oil/dielectric fluid - the next frontier?

    Low-viscosity dimethicone. Chemically non-reactive, non-toxic, easily accesible, good flow and heat characteristics... I run my own MXUS 3K filled (to 1/3) with this thing. "Silicone oils are primarily used as lubricants, thermic fluid oils or hydraulic fluids. They are excellent electrical...
  8. X

    Heat from amps, but what of watts?

    I offer my understanding of the matter: If you have the same piece of wire (ie same resistance), you cannot pass twice the voltage at the same amps . Increasing the volts will increase the flowing amps. If you want to keep the amps the same while increasing the source voltage, you have to...
  9. X

    Right settings for regenerative charge ?

    Going just by numbers, if I get ~40 amps to battery at 70km/h, assuming constant phase amps, it would mean about 20amps at 35km/h . In a linear relationship you have half the speed, you get half the amps to the battery (minus losses in the sysem). As noted by other people in this thread, you...
  10. X

    Right settings for regenerative charge ?

    If it helps anyone in any way, with Sabvoton controller the regen power depends on your actual speed. I have my regen set to 200 Phase amps.... At 60-70 kmph this means about 3000W regen (40 battery amps, give or take, at 72V) At near stop (eg stopping at red lights) the regen force is nearly...
  11. X

    Expert diagnosis required - Hall faults on Sabvoton 72150 / Crystalite shuddering

    1) The programming cable is IMO 100% needed. Here they sell it on its own for 5 bucks+shipping. Definitely worth a shot before buying a whole new controller. You have to have a way to make the ESC perform its "auto-hall-test", whether with the PC cable or bluetooth dongle doesnt matter...
  12. X

    Can't get variable regen working on Sabvoton SVMC 72150

    "Slide recharge " as it is called in the app works as a motor braking in petrol cars. You let go of throttle and the motor slows you down. Once set up, it can not be controlled wrt how strong the brake force is. Anytime you release throttle the same force slows you down... without touching...
  13. X

    QS Motor 205 50H V3ti

    "T" for "thread-side" relates to the axle, not the whole motor. The cable hole in the axle is in the threaded part, not the flat part which you push into dropouts. It is so that the cable exits inbetween two halves of pinch-dropouts, without being squeezed by them. Look where the cable exits...
  14. X

    different brake options and wiring

    Yes, that is correct. quote from the seller's site: http://www.cnqsmotor.com/en/article_read/Sabvoton%20SVMC/SSC%20Series%20Brushless%20Sinusoidal%20Programable%20Motor%20Controller/537.html "2.1. H-brake： If the purple wire connect to 12V，the controller enter brake status， when it disconnect...
  15. X

    different brake options and wiring

    Hello, if I remember correctly, the difference is this: 1) BrakeLow - connect to 0 Volt (battery negative) to engage. This does not produce braking from the motor, only disconnects the power (stops further acceleration) 2)BrakeHigh - connect to +12 Volt (or Battery positive? Not sure) to...
  16. X

    Torque curve inflection point

    Take a good look at the numbers below the graph. Then try to move the cursor line and observe what is happening. As I understand, there are 3 main limiting factors: 1) phase amps (motor amps) limit 2) battery amps limit 3) bEMF rising with motor rpm Good example is with PhaseRunner (hot)...
  17. X

    Motor power question

    TLDR: 20V 50A (DC) from your battery gets converted to 5V 200A (AC) to your motor -- or however much the ESC construction allows -- the AC current to the motor is called "PhaseAmps" ------------------------------------------ The ESC is limited by the mosfets and copper leads inside, they...
  18. X

    Motor power question

    If I remember corrrectly, the difference is 1) "effective output" power, which pulls you up a hill, calculated as bEMF * PhaseAmps 2) total input power, which comes out of your battery, calculated as BatteryVolts * BatteryAmps For ease of demonstration, lets say the PhaseAmps are twice the...
  19. X

    Mudguards for inverted forks ?

    Get a small tube -- or is it called a pipe? -- about 1 cm (1/2"-ish) outer diameter, 1 or 2mm wall thickness. Bend the tube to make it fit over your tire. Measure required length (desired mudguard height) and cut the tube to size. Drill holes to mount the mudguard at the top and for the caliper...
  20. X

    'Plug and Play' Life Cycle Testers

    I actually ordered the EBC-A20 like five days ago from Ali based on the very same article you posted. It will take some time to get here though. I was deciding between this type and the EBC-A40L, which can only do single cell (5V max) but at 40Amp charge/discharge. I'm going to test some large...
  21. X

    bluetooth BMS?

    Oh, now i understand. I dont really do that with my batteries... The TE looks rugged, some are sealable and meant for offroad uses, those could definitely work. I would také a look at things which are meant to run in rain /water, and take inspiration there. Off road cars, quad bikes, even...
  22. X

    bluetooth BMS?

    After i wrote that Wall of text below, I realize this is very off-topic from the focus of the thread. I apologize deeply... I do not change Multipin conectors of the bms, I hard-wire (soldering+tight heatshrink) the balance leads from battery to whatever connector the vendor sends with my bms...
  23. X

    bluetooth BMS?

    Yes, not good translation on my end. Sorry. I thought that if both are from the same seller (IC GOGOGO Store), maybe have simillar brainbox inside, maybe same way to turn on is also the way to turn off (only for longer press). But if seller officially says it will not work, then i would...
  24. X

    bluetooth BMS?

    I have this version BMS : aliexpress.com/item/32826820690.html It has two wires for a momentary button to short circuit the two wires, which acts as on/off switch. Short press the momentary button (hold down for 1 second) switches it on and it emits a short bleep sound Long press (hold down...
  25. X

    KTY83/122

    I'm using a 'Termistor PTC KTY81-122' with my sabvoton temp measurements. As you say, the readings are always about 5 degrees C higher than reality, but it is close enough for me. Reading higher than true temperature is safer for the motor (power cuts out earlier if overheating), than if the...
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