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  1. GGoodrum

    12s2p LiPo pack kit including 12-channel BMS "Lite" Board

    Not yet, but soon. I'm testing the standalone version today, and then will add a pair of CellLogs, to check out how that part works. After that, this "split-BMS" version (embedded LVC/parallel adapter boards + a separate CMS/balancer...) will be ready-to-go. I will then get back to...
  2. GGoodrum

    "Zephyr" - Finally, the "v4" Fechter/Goodrum/Hecker BMS...

    Here is the latest layout variant, that we just turned in to run: Functionally, it is the same, but we've made some accommodations so that this one PCB can support 12s, 16s, 24s and 32s configurations. Also, I think we are a lot closer now to having a final variant. After Richard finishes...
  3. GGoodrum

    "Zephyr" - Finally, the "v4" Fechter/Goodrum/Hecker BMS...

    This was with the original v2.x boards, which had a tap for the 12V regulator off the top of the 4th cell. All of the v4.x variants have the regulator powered from the whole pack voltage. -- Gary
  4. GGoodrum

    Nuvinci developer kits for cheap

    The company is based in California and so even though it is shipped from Texas, you still have to pay sales tax.
  5. GGoodrum

    12s2p LiPo pack kit including 12-channel BMS "Lite" Board

    Yes, this is adjustable with a single resistor value. With the ones I'm using, the balance point is at about 4.13-4.14V. The ALL HVC opos trip when the shunt is fully, right around 4.14V. The failsafe value can be pretty much anything over about 4.17-4.18V. Under normal conditions, even with...
  6. GGoodrum

    12s2p LiPo pack kit including 12-channel BMS "Lite" Board

    Sorry for the delay. I've been testing the standalone/CellLog unit, and have made some changes to accommodate taking advantage of methods' new LVC/HVC boards. First, here's a few pics of the unit I've been testing: There are two boards, one with the cell circuits and the VAL-U-LOK...
  7. GGoodrum

    LVC / HVC / Parallel board run - open for suggestions

    Actually, there's two parallel efforts going on. We have redone the full "Zephyr" BMS, to use our latest charge control scheme, and to make use of the resistor array idea that I stole from you (it only seems fair... :roll: :mrgreen: ), which drastically reduces the build time. This latest...
  8. GGoodrum

    "Zephyr" - Finally, the "v4" Fechter/Goodrum/Hecker BMS...

    Sorry, I missed that. I'm going to try and make the website a priority this weekend, but in the meantime, you can send me a PM. If I were you, however, I'd wait for another week, or so. Monday I am turning in our latest version of the newer, easier to build Zephyr variant, which makes use of...
  9. GGoodrum

    LVC / HVC / Parallel board run - open for suggestions

    Got it. I went back and reread page 11. :) So, for a 6s board, which normally uses a 7-wire pigtail for the cell connections, you will use a 6-wire (5s...) jumper for the LVC and HVC signals. That's easy enough. :) I will use one 20-pin plug that uses 2 pins for the main negative charge lead, 2...
  10. GGoodrum

    LVC / HVC / Parallel board run - open for suggestions

    I don't like the voltage window ones either. We've been doing the same thing with the timed delay. This is for really errant cell failsafe anyway. Under normal conditions, This HVC line shouldn't trip. The shunt circuits will keep the voltages in check, up to a certain point, and once all the...
  11. GGoodrum

    LVC / HVC / Parallel board run - open for suggestions

    Perfect, thanks. :) When you say there is a 1.2 second delay on the HVC, is this in the form of a hysteresis? What I mean is, if it gets set, after 1.2 seconds, and the voltage drops, resetting the opto, will it again take about 1.2 seconds before it is set again? If so, that will save me some...
  12. GGoodrum

    LVC / HVC / Parallel board run - open for suggestions

    Yes, it will, thanks. :) Also, can +12V be used to bias the HVC optos?
  13. GGoodrum

    LVC / HVC / Parallel board run - open for suggestions

    Pucker up! :shock: :roll: :mrgreen: I know the feeling, for sure. :) I think these are great, and I will be ordering some from you as well, or at least steer people your way. Two of these and one of the 12s harnesses I have, plus a Hyperion 1420i will make for a pretty complete setup. These...
  14. GGoodrum

    "Zephyr" - Finally, the "v4" Fechter/Goodrum/Hecker BMS...

    I've done quite a bit of parts replacement, with all the test versions we've done, and I use an inexpensive solder sucker/vacuum device, from Radio Shack, to clear the holes. Works great. :) I've been finding solder bridges to be much less of a problem since we started using these resistor...
  15. GGoodrum

    Nuvinci developer kits for cheap

    On mine, I'm using the pedals mainly for "backup", so I don't care so much about matching cadence. I'm using a 44T up front and a standard 16T freewheel on the NuVinci. For the motor, the pedal freewheel is attached to a 36T sprocket, which is driven by a 13T freewheel on the output shaft of one...
  16. GGoodrum

    "Zephyr" - Finally, the "v4" Fechter/Goodrum/Hecker BMS...

    Yes, the surface mount stuff is an attractive future option, mainly because of the reduced footprint and the possibility of being machine-assembled. With these two new (16 and 24-channel...) Zephyr variants, we have addressed both issues, however, by borrowing from the "Lite" variants I'm still...
  17. GGoodrum

    "Zephyr" - Finally, the "v4" Fechter/Goodrum/Hecker BMS...

    I agree, the test instructions could be better, but I must say, this was never intended to be a project for "first-timers", so to speak. Nonetheless, the whole point of this thread is to provide help for those who are putting one of these together. The big problem with this is that although this...
  18. GGoodrum

    Nuvinci developer kits for cheap

    Huh? :? Have you not been following this thread? There's plenty of us that are doing non-mid drive setups. On my own, I'm using a special 36t rear sprocket that also has a freewheel adapter, so that the pedal chain can drive a standard 16t freewheel. I have an AstroFlight 3220 that will use...
  19. GGoodrum

    12s2p LiPo pack kit including 12-channel BMS "Lite" Board

    Yes, that is true. Also true. With your current setup you will have very little voltage sag at all. Actually, it is not as bad as it looks. :) The balance plugs from the four 6s-8000 packs plug into JST-XH connectors in the middle of the board. There are two sets of 2-to-1 5.5mm bullet...
  20. GGoodrum

    "Zephyr" - Finally, the "v4" Fechter/Goodrum/Hecker BMS...

    Yes, in another week, or so. In the meantime, PM me if you need something. -- Gary
  21. GGoodrum

    One stage reduction?

    That one only does 7s, so it won't work above about 26V. They do have a 200A ESC that handles up to 12s, but there's a paragraph that says don't use it on anything but a plane or a heli:
  22. GGoodrum

    Nuvinci developer kits for cheap

    Thanks, Drew. I went back and re-read your posts about this. I guess the best piece of news I got from your initial tests was that there didn't seem to be a problem shifting under load. The whole reason I was looking to going the manual/pot route was that I worried that the shift tables wouldn't...
  23. GGoodrum

    One stage reduction?

    This controller is only good for 6s, or about 25V.
  24. GGoodrum

    12s2p LiPo pack kit including 12-channel BMS "Lite" Board

    Yes, that will work, and you will not need to disconnect the discharge leads. You would need to put the charge leads form both BMSs in series as well. I still like the idea of using a separate supply with each BMS, but yes, you would either need another of Richard's widgets, or if you can find...
  25. GGoodrum

    Nuvinci developer kits for cheap

    Is this the non-"assist" type of control? Have you tried using this to see how hard it is to change the ratio, especially under load? My original plan was to use twist throttle connected into the analog voltage input, to simulate this operation, but with the power assist. I think Drew tried this...
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