Hi steve, Can you do a capacity test of the two bad cells you took out? How many miles did the guy get before the two cells failed? How much time?
What is the BMS settings for min voltage (discharge) and max voltage (charging)? What model TS cells? I replaced a 200ah Thundersky cell after ~20,000 miles / 2(ish) years. Its capacity loss was about 30% (off the top of my head -- I can find the actual number if someone wants to know) corbin On Jul 17, 2013, at 2:54 AM, Steve Clunn <[email protected]> wrote: > I just replaced 2 cells that where lagging behind in a customers 49 > TS 260ah cell pack , and did a capacity test . I used the car for the > last 3 days and after pulling 230 ah I was not able to make the buzzer > sound even while accelerating at 300 amps ( mine BMS which controls > charger and low voltage buzzer) so I ran the heater a 30 amp load for > another hour and when buzzer sounded ( looked like about 2.7v ) I > stopped test . From most neg up . (Decimals left out ) > trunk 313 309 308 297 309 311 295 321 309 311 side trunk 311 274 309 > back seat 320 319 313 299 285 305 305 307 315 306 306 272 309 373 > 315 317 behind seat 319 269 266 315 312 301 309 312 303 310 313 324 > 324 313 273 309 312 323 323 319 This is probable about 400 cycles at > 100 miles per cycle . This is the best performance I've seen , Hot > here in the summer , over 100 most of the time . I believe the low > amp draw when driving C2 and acceleration 2C ( with 260 ah thst's 500 > amps), never discharging to far, > one extra cell to keep end of charge voltage lower than 3.6. > any thoughts ? > Steve Clunn > Merging the best of the past with > the best of the future. > www.Greenshedconversions.com > _______________________________________________ > UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub > http://lists.evdl.org/listinfo.cgi/ev-evdl.org > For EV drag racing discussion, please use NEDRA > (http://groups.yahoo.com/group/NEDRA) _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
