Welcome to my opensource free BMS thread.
I have added some basic at a glance specs for the working BMS now. And a few basic pics of the setup. I strongly recommend you read all of this first post and wade through as much of the three threads as you can to understand how it all works, was developed and fits together
![Wink :wink:](./images/smilies/icon_wink.gif)
Specs for Modules are as follows.
*********** Slave Module Specification **********
Approx Parts Cost inc pcb $5.00 each.
One slave module per Lithium Cell.
Supply/Cell Voltage 1.75 - 5.00V DC.
Average Supply Current at 3.35v <1ma.
Voltage Ref LM 385 1.235V accuracy 1% Supply/Cell.
Voltage sensing maximum accuracy +/- 20mv.
Maximum balancing/bypass current with 15R resistor 333ma at 5.00V. Maximum Serial Master Bus data rate 4800 baud.
Maximum cell Capacity 65ah. Can be increased to 650ah.
Maximum 128 Slave Modules per Master Module.
Can be increased to 255 Modules using 28X2 Picaxe.
Slave CPU Speed 8mhz with internal resonator.
Permitted Working Cell Voltage Range 1.75 - 4.30V.
************ Master Module Specification *************
Approx Parts Cost inc pcb $100.00 each.
One Master module per complete system.
Supply Voltage 8.00-30.00V DC or as limited by 5.00V 78L05 regulator.
CPU Supply Voltage 5.00V.
CPU Speed 8mhz with internal resonator.
Average Board Supply Current at 12.00v <100ma.
Maximum Serial Master Bus data rate 4800 baud.
Maximum Cell Capacity 65ah. Can be increased to 650ah.
Maximum Pack Voltage 650v.
Maximum Charge/Discharge rate depends on current sensor used.
Maximum 128 Slave Modules per Master Module.
Can be increased to 255 Modules using 28X2 Picaxe.
Battery Pack Temp Sensor Range (-25 to +100C).
Composite Video Display data rate 9600 baud (SV2000 Video Chip).
Composite RCA Video Monitor Output 1V 75ohm PAL/NTSC.
Charger relay output is board supply voltage max 30v at 500ma.
Opto Isolated Charger/Controller Cutback outputs max 50ma 50v.
The Video display is limited to 16x9 characters in a 0-15 & 0-8 matrix.
Pictures & Videos
Digital Slave Schematic.
www.solarvan.co.uk/bms/DigitalSlave080908.jpg
Early test run of Slaves & Master with display from 2008.
www.solarvan.co.uk/bms/MasterTest01.jpg
Latest software display showing various info.
www.solarvan.co.uk/bms/BMS050809001.jpg
www.solarvan.co.uk/bms/BMS050809004.jpg
Youtube BMS Tour Videos. Note there are several available from 2008.
http://www.youtube.com/watch?v=gAaSTQ2cWrk
http://www.youtube.com/watch?v=Wgyg41GIGxU
Hope that helps.
Peter
Dear All
This BMS thread had grown a bit too large, so I'm am starting two additional threads to run alongside the original one.
This BMS General thread contains all the work/discussion upto 15/06/09.
http://www.batteryvehiclesociety.org.uk ... php?t=1245
The BMS Hardware thread will contain any new work/discussion related to the hardware.
http://www.batteryvehiclesociety.org.uk ... php?t=2059
The BMS Software thread will contain any new work/discussion related to the software.
http://www.batteryvehiclesociety.org.uk ... php?t=2060
I hope this makes it a bit more manageable.
New readers should work through the General thread first until they reach 15/06/09, they should then look at specific hardware/software/general threads for further info.
Thanks Peter