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  1. Araknid

    Need help buying cylidrical LTO cells

    I’ve got 18650 type and 18650 but as a capacitor. avoid the blue ones, rubbish at 1100mah. There are these purple ones marked 1865CCW from the 10 I’ve tested they’re all within 25mAh to a nom of 1500mAh. They are a 25% match via ti bqstudio to chem 705 if you’re doing Ti battery packs.. I...
  2. Araknid

    Need help buying cylidrical LTO cells

    I can help you out a little ... I’ve tested about 4 types of 18650 lto cells and found a winner. 1500mah 18650 2.7v to 2.5v and about 3.75Wh
  3. Araknid

    FoxWall-HV

    just the tester i've developed.... ;0 Hmmm the foxBMS master with all its contactors and sensors is near 3k aud, with each slave board being about $400 from memory. can stack 10 high to 120 cells.... ooOOooo I'm doing the PCB assembly on the master module and slave modules starting next month
  4. Araknid

    Three phase HV Hybrid Inverter - Solax X3-Hybrid-8.0 + Solax Triple Power T58 HV Battery

    Heya, A quick rundown before I add more later.. Canbus between the Solax battery and inverter is listed below... Solax wouldn't give me this information directly, so well.. a peak canbus usb dump with busmaster and we have the full start-up init and 1 second poll plus keepalive messages...
  5. Araknid

    FoxWall-HV

    Solax battery canbus communications between master t58 and solax x3 hybrid inverter. Will provide a canbus message format soon :)
  6. Araknid

    FoxWall-HV

    Sorry for late reply :0 cost about 1.2k with all dev boards etc. still coding the sequencing and tuning thr loops. New parts to fit arrived today.
  7. Araknid

    Any Hybrid Inverters work with DIY batteries?

    Oh how can you seeeee? This be canbus solax x3, message id is sequential, absolutely no encryption there be! Now if you sing that.... or not. Okay, solax X3 hybrid HV battery is a simple “hello” and “I’m here every 1sec” with a sequential spam of messages . I can see a counter keep alive...
  8. Araknid

    Any Hybrid Inverters work with DIY batteries?

    ok check out https://powerforum.co.za/topic/2322-youdas-off-grid-lab/page/3/ this has a package called BatteryView which must be a PylonTech tool.. IIIIfffff you used this to find out what its asking the SC0500 and HD48050 system, then you (we) could emulate that interface .. I think the SC0500...
  9. Araknid

    Any Hybrid Inverters work with DIY batteries?

    It’s a slippery slope of requirements... tester well underway :) reverse engineering comms protocol comes next , have a whole BMS to assemble too! Ekk
  10. Araknid

    Any Hybrid Inverters work with DIY batteries?

    The truepower batteries use canbus and the Pylontech uses rs485. the solax inverter throws this out every second ***<Time><Tx/Rx><Channel><CAN ID><Type><DLC><DataBytes>*** 11:16:01:7273 Rx 1 0x1871 x 8 02 00 01 00 01 00 00 00 11:16:02:7272 Rx 1 0x1871 x 8 01 00 01 00 00 00 00 00 I haven’t...
  11. Araknid

    Any Hybrid Inverters work with DIY batteries?

    I have a Solax X3 hybrid inverter that I want to hook my own BMS to... I’ve had a few email requests to Solax for information on either rs485 or the canbus spec, but no success yet. The Pylontech power cube X is the HV battery . It’s a BMS unit with slave 48V shelves in series. The main...
  12. Araknid

    FoxWall-HV

    Also yes, laser cutter go brrrr brrrr. It does look pretty. It’ll be even prettier with the RGBW LEDs underneath each slot for indication of slot state. waiting on some cool m3 anodised standoffs for each slot in red and black to complement the + and - ends.
  13. Araknid

    FoxWall-HV

    Current is measured by a 5mOhm shunt in the high side, amplified and offset to be +-1.20v at Vcm=1.25v. INA821 with an active 4th order filter to remove the inductor ripple. Plus side chain and with a higher bandwidth for hardware comparator OCP in both charge and discharge. voltage also has...
  14. Araknid

    FoxWall-HV

    Cell holder from above when pushed in. 4 wire mech holds cell in place and allows easy insertion and removal. not fiddly like every other 4 wire holder I’ve seen...
  15. Araknid

    FoxWall-HV

    New laser cut 4wire mech slot holder mech. This encases the 8 slot 10A tester.
  16. Araknid

    FoxWall-HV

    New 18650 tester in development. 10A bidirectional sync buck boost , 8 slots.
  17. Araknid

    Are these 2 cells the same? US18650VTC4 C4 MURATA vs SE US18650VTC4 C4

    Vtc5A is different tho, curves changed enough for me to notice in my cell distribution curves. Oh Ye Ive got the VTC6 as well :) c1-6 ... not many tho, maybe like 80 or so left to repair some drill packs at my hacker space... C1 and C2 are industrucable imho. Low cap but hard to kill from...
  18. Araknid

    DC IR VS AC 1kH IR measurements

    Try driving the IRF520F with 14v gate voltage :) I have a push pull circuit that will drive 6A at 10khz no problems :) It has a nice linear response zone for accurate current control. Computing the impendance needs 1khz with at least 16ksps (64x imp even better) , more the better. Have to...
  19. Araknid

    Are these 2 cells the same? US18650VTC4 C4 MURATA vs SE US18650VTC4 C4

    Sony sold their battery division to murata. Murata cells are thus newer :) FWIE Ive tested about 400 VTC5 cells. Their entire chemistry etc are quite consistent across the C1 to C5..
  20. Araknid

    FoxWall-HV

    Ye I got rid of the tp4056 for many of those reasons. Latest laser cut and 3D printed 4 wire slot design. https://github.com/ArakniD/18650-4Wire-ZIF Ill be posting all cad files and output on GitHub
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