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  1. D

    Bafang firmware - Could someone send me a edited file for the G510?

    Does anyone have a stock file for the G510 (no halls) which they could edit for me? I would like to reduce the cut off to 30V if that is possible. Assuming the logic hardware will still operate properly at 30V. Happy to PP $50 for a working file. Thanks. EDIT: Forget it actually because I will...
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    Please recommend me a 100V FET for the Bafang G510 controller

    Please could someone recommend a high quality 100V FET which is suitable for this controller? It is currently using these: HYG064N08NA1B Marking Code: G064N08 Type of Transistor: MOSFET Type of Control Channel: N -Channel Maximum Power Dissipation (Pd): 208 W Maximum Drain-Source Voltage |Vds|...
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    Bafang G510 M620 UART vs CAN efficiency? Which is better for 20S 60A?

    Does anyone know if the controllers are any different in terms of efficiency? I saw a CAN PCB and it looked really different to the UART one. It looked like they had added current measuring on the phases. I am just interested to know if the CAN version is any better than the UART. I would...
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    Chinese copper welding machine

    I recently asked a seller from China who sells 0.2mm copper strip and other battery building supplies what they use to weld 0.2mm copper and the guy said this pulse argon spot welder can be used. Has anyone tried this...
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    5x Maxwell 1200F Ultracapacitors + BMS

    Brand new. All 5x are between 0.40mOhm - 0.42mOhm. One of the threads needed repairing as it was damaged. I was originally going to use these in a 5S configuration and adjust the charge voltage with an adjustable PSU so I could regulate the welding current. I changed my plans and went with 3S...
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    Help with nylon gear in BBSHD

    Do you know if the centre of the needle bearing is supposed to turn? I need to replace my nylon gear and I noticed on the replacement gear the middle part of the bearing does not turn but the front and rear parts do. The needle rollers all spin but the needle cage itself does not spin like the...
  7. D

    Step up DC-DC charger repair

    Recently I have been using the DPX800S modules to charge batteries. I used to use the common 1200W/1800W "house brick" step up converters but the DPX800S is much more refined so I have swapped over to these. I have a faulty module and I wondered if you could replace the main FET with something...
  8. D

    How to make a mosfet switch?

    I would like to make a 100V mosfet switch and I would ideally like to make it as simple as possible, could someone with some experience help me please :?
  9. D

    Molicel P26A - Rejects

    I have 215 Molicel P26A. All of them have very slight dents on the bottom of the can. I have tested all of them for self discharge and also capacity tested around 30 random samples. They all drift inconsistently from each other but anything more than 10mV over 1 month I removed. The capacity of...
  10. D

    What are these terminals called?

    I was wondering if anyone knew what these terminals are called or if someone had a part number? I would like to order them from Mouser or Digikey but I have no idea what the official name is or even if they are manufactured by a main brand. They fit in this HY2.0 connector housing.
  11. D

    Thin walled phase wire?

    Recommendations? Ideally 15mm2 or larger.
  12. D

    R4875G1 - How to switch on?

    I recently upgraded my R4850G2 to a R4875G1 and I am wondering if I can jump the same pins to get it to switch on. Usually it is the pre charge pin and main DC ground to the slot detection pin. On the R4875G1 the board and pads are slightly different so the control unit is probably different. I...
  13. D

    2x Brand New RG4850G2 3000W Rectifiers - Nucular Chargers

    I have already modded these internally so they will switch on without any extra solder joints on the external PCB. Both units are brand new and have only been opened so the modification could be added. I also have the CAN modules to adjust the voltage and current if you need those. If you want...
  14. D

    Measuring super capacitor ESR?

    Does anyone know if it is possible to measure ESR with a ACIR 1khz meter? I got 3.44mOhm when charged to 2.75V. The capacitor is a Maxwell BCAP 1200 P270 which is supposed to have a DC ESR of 0.58mOhm. Does anyone have a conversion factor or a comparison with the same meter on the same series of...
  15. D

    New type of PAS. Is it faulty?

    I recently bought a newer style of PAS but it does not turn. Is it supposed to be like this? The older style sensors used to be made from a sensor and a separate magnet disc. :?
  16. D

    QS205 rim and RCP2S 265mm 750lb

    Does anyone know of a strong 18x1.85 or 18x2.15 that is not too expensive and is available from the UK? I have seen lots of posts regarding bent rims and I don't really want to have to replace it if I don't need to. Also would a RCPS2 265mm with a 750lb spring be better than a 240mm with a...
  17. D

    How to get the most power out of a QS205 50H?

    I am wondering how to get the most power out of this setup: QS205 50H (kV not decided) Nucular 24F at 300bA/500pA 25" total wheel size 10-50mph I know the basic theory is to condense the motors available power into a useful rpm range but as we all know this is not as easy as it sounds when...
  18. D

    Understanding QS205 efficiency and power

    Could someone please help me to understand what parameters and variables effect efficiency and performance? I have tried to use the data that I have for the QS205 on the Grin motor sim but I have a feeling the results are not accurate. I used the Cromo5004 and adjusted the Kv to suit the 3T, 4T...
  19. D

    BMS testing station?

    Has anyone seen one of these before? https://www.aliexpress.com/item/4000260997676.html?spm=a2g0o.cart.0.0.795a3c00QvkzX8&mp=1 I messaged the seller and asked them what the values are set at but got no response. Probably 4.28V and 2.5V right?
  20. D

    8.4V Charger for a 2S Kweld

    I am trying to finish my Kweld setup. At the moment I have 2x 2S 5Ah graphene packs paralleled together which do around 1175A when welding pure 0.15mm nickel which is perfect. What I would like to do is have a charger keeping them at 8.2V. I have bought a 8.4V charger and a simple BMS but there...
  21. D

    Spot welding pen. Has anyone tried this one?

    I am looking for a welding pen that can give nice consistent welds with 0.15 nickel. I saw something like this on the Kweld thread...
  22. D

    DIY temperature cut off on a regular BMS

    Hi, Has anyone added a temperature switch to the balance/sense wires? I was wondering if it would be possible to add a temperature switch in series with one of the balance wires, it would be nice to have temperature protection on those BMSs that do not have it built in.
  23. D

    Charging without CV or CC on a type 2 EV station?

    Does anyone know anything about this? I will be making a 72V battery and would like to charge at around 45A, I don't need CV as this will be a range boost setup only and I will be using a programable BMS and coulomb meter with a relay as a safety cut off. I was wondering if you could use the...
  24. D

    0-120V 0-30A variable rectifier/amps/charger, is it ok?

    Does anyone have any information or a review on this charger? https://www.aliexpress.com/item/32999030765.html These chargers are not too expensive but the modules that are not yet modded seem really cheap. I wonder how difficult it is to modify one to make one of these variable chargers? I...
  25. D

    Quick modifactions for the Sunkko 709AD

    I just thought I would show a few quick mods I did for the Sunkko 709AD. My goal was to increase the efficiency of this welder as I like to weld really fast and I hate waiting for things like wires, circuitry or the welding tips to cool down. I have a "boss welder" that puts out way more amps...
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