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  1. R

    bluetooth BMS?

    in the download section a version "V1.A-20180514" of the JBDTools is available. I wonder if this is the latest version? It looks the same as the version V1.8-20170822 displayed here. These versions amongst other things allow to select the language. Unfortunately part of the english text in the...
  2. R

    bluetooth BMS?

    As far as I know this board is manufactured by Shenzhen Jiayuda/Jiaxa Technology Co., Ltd. (http://www.jiabaida.com , JBD, e.g. downloads http://www.jiabaida.com/home-1.7-info-id-104-catId-52.html). It seems to be the latest version (v1.4) of the SP- series, which all use the above TI chip. Thus...
  3. R

    bluetooth BMS?

    The TI documentation for the bq769x0 Battery Monitor Family e.g. http://www.ti.com/lit/gpn/bq76920 explains it in tables 8-1 to 8-3. This BMS carries two bq76940 thus allows for 2x15 cells to connect. For a 22s arrangement you need to short 8 cell inputs - you have several possibilities to do...
  4. R

    bluetooth BMS?

    The manual which came with the JBDTools 1.1 reads: Balance: turn on balance function. Chg balance: turn on the balance function during charge. If disabel Chg balance, then static balance, eg: the difference of battery more then 0.4V, then balance work. Enable is charge balance. Disable is...
  5. R

    Hybrid trains, cheap partial electrification, momentum~

    Trains in our steep mountain slopes use the motors as generators to de-accelerate. The generated el. current is fed via the overhead line to the train on the other side of the mountain to do the climb (see). r
  6. R

    Adaptto Mini-E/Max-E Owner's Thread

    I recently received a first generation mini-e from a friend. It doesn't have the on/off wiring and I'd like to know, where I could tweak the system to include such an on/off (kill) switch. I searched for a while and it seems the only option is to splice it in the 'red' wire which feeds the...
  7. R

    Speedict Ebike - Anybody seen/tried this?

    It shouldn't be too difficult to combine the data arriving from 2 Neptune's on the same smart phone display !? I'd love to see such a feature (just software changes required, I guess)
  8. R

    Adaptto Mini-E/Max-E Owner's Thread

    Can anyone explain what "...channel B, outputted to the contact pad..." exactly mean? what and where are the "contact pads"? I would like to connect a second, external battery back and hope "channel B" might be useful !? r
  9. R

    connections for? EcityP Smart S5-13 BMS

    If pin VBAT4 does not have >6.5V the OZ890 will not start! r
  10. R

    connections for? EcityP Smart S5-13 BMS

    I am not aware of any chip revisions made and the valid tech reference still is the "08/03/2009 OZ890 - DataSheet - V1.6": OZ890 has embedded O2micro “Balance on Demand (BOD)” technology which starts up bleeding when the following conditions are all satisfied: Battery pack is in charge state...
  11. R

    connections for? EcityP Smart S5-13 BMS

    see here (excerpts from the OZ890 datasheet...)
  12. R

    Cycle Analyst V3 preview and first beta release

    it's all non English, though: Art. 18 Motorfahrräder
  13. R

    Cycle Analyst V3 preview and first beta release

    thx, I'll study the details... the new FoundingPower CS-BMS (and EBS-BMS) only cut off the charging current and the auxiliary supply current (lights, CA, ...) - the main discharge current via the controller is cut off via a throttle limiter signal (pull down throttle signal either 'binary' or...
  14. R

    Cycle Analyst V3 preview and first beta release

    I'd like to use a CAv3 to set up 3 modes on my newest e-bike built in accordance with the 2012 Swiss regulations: e-Velo: 0.5kW max. motor power, up to 20km/h 'motor only mode' allowed, up to 25km/h only 'motor assist mode' allowed, above 25km/h pedal only (no motor allowed) e-Bike: 1.0kW max...
  15. R

    Something based on this will revolutionize the world

    That's exactly the point! Discussing renewable energy efficiencies should cover the entire conversion chain and will finally lead to discussions about requirements of non-renewable resources such as land and metals. Here we compare the conversion of solar photons to chemical forms of energy...
  16. R

    huge lipo fire , not cool

    you are quite correct - cells starting unexpectidly a thermal runaway are very rare events - but it happens ! There are many possible reasons e.g. components depassing manufacturing tolerances such as to large pores in the PE separator foils which may produce internal shorts... The stricter the...
  17. R

    Zero-Draw, Solid State Contactor w/Precharge (Arduino)

    http://www.sinusleistungssteller.de/ sell since some weeks a solid state contactor with 'fuse', 'soft start' etc. capabilities (all text in german only), r
  18. R

    Possible Arduino Shield for LTC6804, LTC6830 or LTC3300

    agree and subscribed, r
  19. R

    Arduino BMS Shield using TI BQ76PL536A (Update 9/16)

    I am very interested in combining the LTC6803 with the new LTC3300. Controlling the two with some smart software should allow for pretty advanced balancing strategies - far beyond simple top balancing via cell bleeding. Has anyone followed this up? r
  20. R

    LiPo cell drained to 2.69V, arg, what now?

    Is it the first cell in the pack i.e. at the minus ? I wonder why it is often the first cell which drains first - I frequently see damaged packs where cell 01 is dead. Do others have the same experience? and if yes: any explanation? At 2.7V discharge voltage I would still use the cell unless it...
  21. R

    foundingpower programmable bms

    Yes, 2A is probably too low - there is a threshold of 2-4A below which current is indicated as 0. I don't know the reason, probably the AD converter operates at 8bits... Yes, you must calibrate the current sensor i.e. feed a large enough current (I use ca. 20A, more would be better for...
  22. R

    connections for? EcityP Smart S5-13 BMS

    the OZ890 follows a particular power up sequence: make sure pin BAT4 has the required voltage! from the specs: "When power supply is applied to VCC>8.5V and the voltage at pin BAT4 of OZ890 is higher than 6.5V, the common bias starts first, followed by the band-gap and 3.3V & 2.5V LDOs. When...
  23. R

    Definitive Tests on the Heating and Cooling of Hub Motors

    we are currently testing electric discharge machining (EDM) oil as a coolant in our (GM) hub motors. We had many issues with transformer oil weakening synthetics in e.g. shaft seals. We are hesitant using EDM oil, however, since flash points might be too low. What would you consider an...
  24. R

    connections for? EcityP Smart S5-13 BMS

    it is crucial to energize the OZ890 chip before you connect the balancer wires! Thus connect first B- and then P+ after that you can plug in the JST connector. As all the input lines (B1 - B13) are polarized already after pre-connecting B- and then P+ the connection sequence of the balancer...
  25. R

    connections for? EcityP Smart S5-13 BMS

    Ahh - so you have bought a 5-13s sBMS ; I thought you bought the dual OZ890 BMS shown in the foto above - I am searching for a place to buy thistype... let me know the outcome of your tests - I'd start bleeding at lower voltages to gain more bleeding time... r
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