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  1. K

    O2Micro OZ890 Based BMS Units

    I think I might go for something simple like this http://batterybms.com/balanceboard/jh09.html since my main aim is for the NCR18650Bs not to get out of balance on charge.
  2. K

    connections for? EcityP Smart S5-13 BMS

    it says it's drawing 191 mA but my multimeter says it's only 20mA. Clearly 20mA at 49.8v is making the chip run too hot at 68 degrees. This strikes me as a very cranky design does anybody know of a more robust BMS for 13 cells?
  3. K

    O2Micro OZ890 Based BMS Units

    It says it's drawing 191 mA but my multimeter says 20mA. Whatever the current is the chip is way too hot. This product strikes me as way too tempremental for robust battery management.
  4. K

    O2Micro OZ890 Based BMS Units

    Hey thanks for that. I powered it up from Vcc 12v & also connected B4 to 12v so that it can wake up properly & I can read the EEPROM. But it draws 20mA continuous now, surely I can't leave it connected permanently across a pack with that sort of stdby current?
  5. K

    O2Micro OZ890 Based BMS Units

    Hi gents. I've got one of these BMS cards along with an Aardvark interface & OZ890 debug tool software http://www.bmsbattery.com/smart/135-smart-bms-usb-i2c-adapter-programmer-reader-writer-monitor.html I have some issues; 1) Can't read the onboard eprom, I2C bus sits at 2.5v & their is data...
  6. K

    connections for? EcityP Smart S5-13 BMS

    I can't seem to get theOZ890X_087 software that came with this card to connect? I've got the card powered from a 24v supply but when I plug it in the little connect icon only goes green briefly & I can't get anything meaningful from the card. The BMS was supposedly setup prior to shipping for 13...
  7. K

    connections for? EcityP Smart S5-13 BMS

    Thanks for the heads up on the connection sequence. I'm actually having second thoughts about the whole BMS idea. I've got 39 Panasonic NCR18650Bs (13s3p) charging from a 54.6v 4A charger & they seem fine, no sign of cells getting out of balance. I also dismantled a commercial 10Ah pack, no sign...
  8. K

    connections for? EcityP Smart S5-13 BMS

    I've wired the 14 way plug from one of these units to my battery pack but when I plug the BMS card in it's going to make all 14 connections simultaneously. I can't believe the complicated procedure in the apps note of connecting power then ground then each of the 13 cells is really necessary...
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