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  1. Z

    Potentially Stupid Idea for an NiMh to LiFePO4/Na+ Retrofit on a Hybrid

    You know what, I kinda want to ask a more direct question on using Na+ cells. Doing a little more math, which may very well be missing some nuance and expertise, a NiMh voltage cutoffs would be 1.4 and 0.9, with a nominal of 1.2. With 5 cells that’s 7 and 4.5 with a nominal of 6. A Na+...
  2. Z

    Potentially Stupid Idea for an NiMh to LiFePO4/Na+ Retrofit on a Hybrid

    I’m surprised the CVT didn’t self destruct before the battery did in that Honda. I’ve been eyeing replacement packs, but I don’t trust them that much. They’re probably better than my current pack, but they’re likely using the same cells from original manufacture date, but ran them through a...
  3. Z

    Potentially Stupid Idea for an NiMh to LiFePO4/Na+ Retrofit on a Hybrid

    These are neat, the discharge rate is definitely closer to what’s needed even if the capacity is lower. It’s a 250s NiMh originally, so if I ratio your 84s, that gets to 105s I think. I did notice how flat the curve is for LiFe is compared to NiMh, I doooooon’t think that would be too much of a...
  4. Z

    Potentially Stupid Idea for an NiMh to LiFePO4/Na+ Retrofit on a Hybrid

    I appreciate the response. I’m fully aware that this pack can’t have the voltage dead reckoned forever, and getting perfectly matched cells is impractical. Hence why I said I would trick the factory BMS into hopefully thinking it never needs to balance with a resistor divider, then have my own...
  5. Z

    Potentially Stupid Idea for an NiMh to LiFePO4/Na+ Retrofit on a Hybrid

    So I have a Gen 1 Ford Escape hybrid with a weak hv battery. Works fine when the computers catch up with the real capacity, but I would like to get the real electric performance one way or another. I’m down for replacing the cells since I doubt any 20-year-old battery is gonna have that many...
  6. Z

    Cheap FOCer (VESC 4.12 based design)

    Okay so just finished and tested board 3 sadly it has the same problem as board 2, except worse, can barely spin even with a push, the movement is a bit chunkier. When going through my parts, I did notice that for the 0.1uF caps I accidentally got 50V rated ones instead of 100V, none are popping...
  7. Z

    Cheap FOCer (VESC 4.12 based design)

    Very weakly, almost like only 2 phases are engaging, won't spin on its own. If you give it a push, it spins, but again, very weak, and very slow acceleration. After a bit, it stops, tries to do the constant speed but can't spin itself, get a bad detection result, with or without a push in the...
  8. Z

    Cheap FOCer (VESC 4.12 based design)

    Aight, legit DRVs came in the mail, so I started messing with board 2 since it was the least usable, started with redoing the groundpad, which you were right, didn't get enough solder, need to add more paste next time. The vias also worked great to purge extra solder from the groundpad. This...
  9. Z

    Cheap FOCer (VESC 4.12 based design)

    Okay so, I've started assembly on my 0.9 boards, gonna start number 3 soon. Not complaining just wondering if there's something obvious I'm missing with the design. Board 1 worked for the most part, however after 9 amps, it'll throw a DRV8302 fault, could be the DRV, got it from ebay to save...
  10. Z

    Cheap FOCer (VESC 4.12 based design)

    Hi, I'm gonna take a stab at this design for a project of mine that requires 4 of these bad boys, I've spent a few days updating the LCSC bom for stock shortfalls, and I have a question about the CAN transceiver selection. The original 4.12 bom calls for the SN65HVD232DR, the new bom uses the...
  11. Z

    Sunkko 737G Transformer Rewiring

    I'm not sure if the 709 has the same transformer as the 737, but I'll share how to get the 220V setting anyway. Basically, changing the winding config doesn't effect anything else on the machine, it's all about the inductance in the iron core of the transformer. The main board gets it's power...
  12. Z

    Sunkko 737G Transformer Rewiring

    The conversion was successful, tad bit of a leap of faith on the phasing, but it works just like before. Attached is how I ended up soldering the transformer. The plug, I just chopped the end off and soldered the end of a spare IEC plug.
  13. Z

    Sunkko 737G Transformer Rewiring

    I got the 220V version by accident, and I didn't want to wait another month for the right one. I have a 3000VA converter to verify that it worked, now I'm trying to change the wiring for 110V use, mostly for convenience and a proper ground, but I don't think the converter likes the sudden 99%...
  14. Z

    Nunchuck (Kama) to VESC I2C doesn't work, any Howto?

    Hi, this seemed like the right place to put this, I've been working on a pair of VESCs, and during a test, c25 on the master with the nyko kama blew, and seems to have killed the ICs. Now, when I tried to use the nyko kama on the surviving slave, the receiver was blinking, however as soon as I...
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