On Wed Mar 08 08:08:01 PST 2017 [email protected] said: >Would you share what you're doing to build a BMS, what you've learnt etc?
This is my 5th BMS version. I originally had units with little micro computers on them, and all kinds of nifty digital features. (revs 1 - 3) PITA to program, reliable communications difficult, expensive, and was hard to detect individual unit failures. While it was "fun" to watch all the individual voltages on a display, it wasn't especially USEFUL to do so. Rev 4 and 5 have gone back to a simple analog system. It detect undervoltage, overvoltage, and has up to 200ma of bypass balancing. The only output of the units is a single small LED on each reg (on is good!), and a single wire output that is daisychained from unit to unit. The wire is a current loop, so if ANYTHING goes wrong (unit fails, wire comes loose, cell goes completely dead, etc..) you loose signal. My in-cab indicator is a green LED that is on if all is good, and a buzzer that goes off if something is wrong. I've also hooked up a small relay to shut off the charger if "something wrong" happens. -- Worlds only All Electric F-250 truck! http://john.casadelgato.com/Electric-Vehicles/1995-Ford-F-250 _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org Read EVAngel's EV News at http://evdl.org/evln/ Please discuss EV drag racing at NEDRA (http://groups.yahoo.com/group/NEDRA)
