Search found 8 matches

by krismclean
May 09 2013 7:00pm
Forum: Battery Technology
Topic: O2Micro OZ890 Based BMS Units
Replies: 130
Views: 25894

Re: 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.
by krismclean
May 08 2013 7:16pm
Forum: Battery Technology
Topic: connections for? EcityP Smart S5-13 BMS
Replies: 187
Views: 49991

Re: connections for? EcityP Smart S5-13 BMS

http://i1125.photobucket.com/albums/l590/krismclean/BMS130408_zps96b59d23.jpg 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 ...
by krismclean
May 08 2013 7:08pm
Forum: Battery Technology
Topic: O2Micro OZ890 Based BMS Units
Replies: 130
Views: 25894

Re: O2Micro OZ890 Based BMS Units

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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.
by krismclean
May 07 2013 8:27pm
Forum: Battery Technology
Topic: O2Micro OZ890 Based BMS Units
Replies: 130
Views: 25894

Re: 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?
by krismclean
May 07 2013 1:40am
Forum: Battery Technology
Topic: O2Micro OZ890 Based BMS Units
Replies: 130
Views: 25894

Re: 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 on it b...
by krismclean
May 06 2013 11:50pm
Forum: Battery Technology
Topic: connections for? EcityP Smart S5-13 BMS
Replies: 187
Views: 49991

Re: 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 cel...
by krismclean
Apr 21 2013 4:03am
Forum: Battery Technology
Topic: connections for? EcityP Smart S5-13 BMS
Replies: 187
Views: 49991

Re: 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 of ...
by krismclean
Mar 26 2013 6:52pm
Forum: Battery Technology
Topic: connections for? EcityP Smart S5-13 BMS
Replies: 187
Views: 49991

Re: 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? What's...