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Author Topic: WARNING: Max allowed voltage difference is 500mV  (Read 950 times)

domingo3

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WARNING: Max allowed voltage difference is 500mV
« on: April 29, 2017, 08:09:01 AM »

Picked up my 2016 FXS from the dealer after this : http://electricmotorcycleforum.com/boards/index.php?topic=6567.0

  The motor was replaced and based on the logs I've seen, firmware was updated from rev48 to rev50.  Now in the logs, I get a bunch of "WARNING: Max allowed voltage difference is 500mV" that I never got before.  Using the app, "cell balance" is <=12mV. 
 
  I would like to understand if this is a new warning put out by the new firmware, or if something possibly happened to the batteries while the bike sat for a month at the dealer.  Has anyone else seen this warning in their logs or know what it means? 

  My plan is to leave the bike plugged in over the weekend and see if the BMS does some other balancing that might make this warning go away.  I don't think I notice any effect specific to this warning while riding.  It's probably unrelated, but this motor seems to heat up more quickly, and i still get a lot of "Batt Dischg Cur Limited".

Some logs are pasted below.  Took the bike to the shop on 21 March, and picked it up on 27 April.

Code: [Select]
01172     04/28/2017 14:20:59   Batt Dischg Cur Limited    449 A (86%), MinCell: 3610mV, MaxPackTemp: 40C
 01173     04/28/2017 14:21:58   DEBUG: Module scheme changed from Running mode to Stopped mode
 01174     04/28/2017 14:21:58   DEBUG: Module mode Change Does Not Require Disconnect
 01175     04/28/2017 14:21:59   Disarmed                   PackTemp: h 39C, l 39C, PackSOC: 50%, Vpack:102.357V, MotAmps:   0, BattAmps:   0, Mods: 11, MotTemp:  67C, CtrlTemp:  39C, AmbTemp:  34C, MotRPM:   9, Odo: 6949km
 01176     04/28/2017 14:21:59   Batt Dischg Cur Limited    457 A (87%), MinCell: 3648mV, MaxPackTemp: 39C
 01177     04/28/2017 14:22:00   Power Off                  Key Switch
 01178     04/28/2017 14:22:00   Sevcon Turned Off
 01179     04/28/2017 14:22:00   Module 00 Opening Contactor  vmod: 102.354V, batt curr:   0A
 01180     04/28/2017 14:22:00   Module 01 Opening Contactor  vmod: 102.364V, batt curr:   0A
 01181     04/28/2017 14:22:00   INFO:  Disabling External Chg 0 Charger 2
 01182     04/28/2017 14:22:00   INFO:  Disabling External Chg 1 Charger 3
 01183                       0   DEBUG: Reset: Power-On, External
 01184                       0   Power On                   Key Switch
 01185                       0   Key On
 01186                       0   DEBUG: Module scheme changed from None mode to Stopped mode
 01187                       0   Module 00 Opening Contactor  vmod:   0.000V, batt curr:   0A
 01188                       0   Module 01 Opening Contactor  vmod:   0.000V, batt curr:   0A
 01189                       0   DEBUG: Module scheme changed from Stopped mode to Running mode
 01190                       0   Module 00 CAN Link Up
 01191                       0   Module 01 CAN Link Up
 01192                       0   Module 00 Registered       serial: 16sg2654,  vmod: 102.726V
 01193     04/28/2017 14:39:29   Module 01 Registered       serial: 16sg2651,  vmod: 102.737V
 01194     04/28/2017 14:39:34   Sevcon Turned On
 01195     04/28/2017 14:39:34   DEBUG: Module scheme changed from Running mode to Stopped mode
 01196     04/28/2017 14:39:34   DEBUG: Module mode Change Does Not Require Disconnect
 01197     04/28/2017 14:39:35   Sevcon CAN Link Up
 01198     04/28/2017 14:39:35   DEBUG: Sevcon Contactor Drive ON.
 01199     04/28/2017 14:39:35   Module 00 Closing Contactor  vmod: 102.722V, maxsys: 102.720V, minsys: 102.702V, diff: 0.018V, vcap: 90.750V, prechg: 88%
 01200     04/28/2017 14:39:35   Module 01 Closing Contactor  vmod: 102.734V, maxsys: 102.720V, minsys: 102.702V, diff: 0.018V, vcap: 90.750V, prechg: 88%
 01201     04/28/2017 14:39:35   DEBUG: Module 00 Contactor is now Closed
 01202     04/28/2017 14:39:35   DEBUG: Module 01 Contactor is now Closed
 01203     04/28/2017 14:39:35   INFO:  Enabling External Chg 0 Charger 2
 01204     04/28/2017 14:39:35   INFO:  Enabling External Chg 1 Charger 3
 01205     04/28/2017 14:39:36   DEBUG: Module scheme changed from Stopped mode to Running mode
 01206     04/28/2017 14:39:36   DEBUG: Module mode Change Does Not Require Disconnect
 01207     04/28/2017 14:39:43   Riding                     PackTemp: h 39C, l 39C, PackSOC: 50%, Vpack:101.462V, MotAmps: 206, BattAmps:  66, Mods: 11, MotTemp:  53C, CtrlTemp:  38C, AmbTemp:  36C, MotRPM: 966, Odo: 6949km
 01208     04/28/2017 14:39:43   Batt Dischg Cur Limited    479 A (92%), MinCell: 3621mV, MaxPackTemp: 39C
 01209     04/28/2017 14:40:43   Riding                     PackTemp: h 39C, l 39C, PackSOC: 49%, Vpack:102.308V, MotAmps:   0, BattAmps:   0, Mods: 11, MotTemp:  57C, CtrlTemp:  39C, AmbTemp:  36C, MotRPM:2100, Odo: 6950km
 01210     04/28/2017 14:40:43   Batt Dischg Cur Limited    466 A (89%), MinCell: 3647mV, MaxPackTemp: 39C
 01211     04/28/2017 14:41:43   Riding                     PackTemp: h 39C, l 39C, PackSOC: 49%, Vpack:102.120V, MotAmps:  19, BattAmps:  11, Mods: 11, MotTemp:  58C, CtrlTemp:  39C, AmbTemp:  35C, MotRPM:1756, Odo: 6950km
 01212     04/28/2017 14:41:43   Batt Dischg Cur Limited    459 A (88%), MinCell: 3637mV, MaxPackTemp: 39C
 01213     04/28/2017 14:42:43   Riding                     PackTemp: h 39C, l 39C, PackSOC: 48%, Vpack:101.923V, MotAmps:  31, BattAmps:  17, Mods: 11, MotTemp:  58C, CtrlTemp:  38C, AmbTemp:  35C, MotRPM:1783, Odo: 6951km
 01214     04/28/2017 14:42:43   Batt Dischg Cur Limited    460 A (88%), MinCell: 3633mV, MaxPackTemp: 39C
 01215     04/28/2017 14:43:43   Riding                     PackTemp: h 39C, l 39C, PackSOC: 47%, Vpack:101.119V, MotAmps:  30, BattAmps:  25, Mods: 11, MotTemp:  62C, CtrlTemp:  39C, AmbTemp:  34C, MotRPM:2779, Odo: 6952km
 01216     04/28/2017 14:43:43   Batt Dischg Cur Limited    433 A (83%), MinCell: 3597mV, MaxPackTemp: 39C
 01217     04/28/2017 14:44:43   Riding                     PackTemp: h 39C, l 39C, PackSOC: 46%, Vpack:100.227V, MotAmps:  46, BattAmps:  59, Mods: 11, MotTemp:  62C, CtrlTemp:  38C, AmbTemp:  34C, MotRPM:4093, Odo: 6953km
 01218     04/28/2017 14:44:43   Batt Dischg Cur Limited    436 A (83%), MinCell: 3565mV, MaxPackTemp: 39C
 01219     04/28/2017 14:44:57   WARNING: Max allowed voltage difference is 500mV
 01220     04/28/2017 14:44:58   WARNING: Max allowed voltage difference is 500mV
 01221     04/28/2017 14:45:43   Riding                     PackTemp: h 39C, l 39C, PackSOC: 46%, Vpack:100.297V, MotAmps: 138, BattAmps:  79, Mods: 11, MotTemp:  63C, CtrlTemp:  38C, AmbTemp:  34C, MotRPM:1854, Odo: 6954km
 01222     04/28/2017 14:45:43   Batt Dischg Cur Limited    439 A (84%), MinCell: 3578mV, MaxPackTemp: 39C
 01223     04/28/2017 14:46:43   Riding                     PackTemp: h 39C, l 39C, PackSOC: 44%, Vpack: 99.274V, MotAmps:  82, BattAmps:  87, Mods: 11, MotTemp:  65C, CtrlTemp:  40C, AmbTemp:  35C, MotRPM:3420, Odo: 6955km
 01224     04/28/2017 14:46:43   Batt Dischg Cur Limited    415 A (79%), MinCell: 3530mV, MaxPackTemp: 39C
 01225     04/28/2017 14:47:06   WARNING: Max allowed voltage difference is 500mV
 01226     04/28/2017 14:47:10   WARNING: Max allowed voltage difference is 500mV
 01227     04/28/2017 14:47:43   Riding                     PackTemp: h 40C, l 40C, PackSOC: 42%, Vpack: 97.017V, MotAmps: 184, BattAmps: 195, Mods: 11, MotTemp:  72C, CtrlTemp:  41C, AmbTemp:  35C, MotRPM:3826, Odo: 6956km
 01228     04/28/2017 14:47:43   Batt Dischg Cur Limited    403 A (77%), MinCell: 3374mV, MaxPackTemp: 40C
 01229     04/28/2017 14:48:40   WARNING: Max allowed voltage difference is 500mV
 01230     04/28/2017 14:48:43   Riding                     PackTemp: h 40C, l 40C, PackSOC: 40%, Vpack:100.686V, MotAmps: -50, BattAmps: -37, Mods: 11, MotTemp:  81C, CtrlTemp:  43C, AmbTemp:  34C, MotRPM:2646, Odo: 6957km
 01231     04/28/2017 14:48:43   Batt Dischg Cur Limited    358 A (68%), MinCell: 3586mV, MaxPackTemp: 40C
 01232     04/28/2017 14:49:43   Riding                     PackTemp: h 41C, l 40C, PackSOC: 39%, Vpack:100.170V, MotAmps:  13, BattAmps:  12, Mods: 11, MotTemp:  78C, CtrlTemp:  42C, AmbTemp:  35C, MotRPM:3276, Odo: 6958km
 01233     04/28/2017 14:49:43   Batt Dischg Cur Limited    392 A (75%), MinCell: 3567mV, MaxPackTemp: 41C
 01234     04/28/2017 14:49:58   WARNING: Max allowed voltage difference is 500mV
 01235     04/28/2017 14:49:59   WARNING: Max allowed voltage difference is 500mV
 01236     04/28/2017 14:49:59   WARNING: Max allowed voltage difference is 500mV
 01237     04/28/2017 14:50:43   Riding                     PackTemp: h 41C, l 40C, PackSOC: 39%, Vpack:100.896V, MotAmps:   0, BattAmps:   1, Mods: 11, MotTemp:  74C, CtrlTemp:  41C, AmbTemp:  35C, MotRPM:1590, Odo: 6958km
 01238     04/28/2017 14:50:43   Batt Dischg Cur Limited    404 A (77%), MinCell: 3591mV, MaxPackTemp: 41C
 01239     04/28/2017 14:51:43   Riding                     PackTemp: h 40C, l 40C, PackSOC: 39%, Vpack:101.257V, MotAmps:   0, BattAmps:   0, Mods: 11, MotTemp:  71C, CtrlTemp:  40C, AmbTemp:  35C, MotRPM: 469, Odo: 6959km
 01240     04/28/2017 14:51:43   Batt Dischg Cur Limited    417 A (80%), MinCell: 3606mV, MaxPackTemp: 40C
 01241     04/28/2017 14:52:43   Riding                     PackTemp: h 40C, l 40C, PackSOC: 38%, Vpack: 99.728V, MotAmps:  67, BattAmps:  59, Mods: 11, MotTemp:  71C, CtrlTemp:  41C, AmbTemp:  35C, MotRPM:2814, Odo: 6960km
 01242     04/28/2017 14:52:43   Batt Dischg Cur Limited    403 A (77%), MinCell: 3550mV, MaxPackTemp: 40C
 01243     04/28/2017 14:53:43   Riding                     PackTemp: h 40C, l 40C, PackSOC: 37%, Vpack:100.551V, MotAmps:   0, BattAmps:   2, Mods: 11, MotTemp:  72C, CtrlTemp:  41C, AmbTemp:  35C, MotRPM:2614, Odo: 6961km
 01244     04/28/2017 14:53:43   Batt Dischg Cur Limited    393 A (75%), MinCell: 3580mV, MaxPackTemp: 40C
 01245     04/28/2017 14:54:43   Riding                     PackTemp: h 40C, l 40C, PackSOC: 37%, Vpack:101.042V, MotAmps:   0, BattAmps:   0, Mods: 11, MotTemp:  69C, CtrlTemp:  40C, AmbTemp:  35C, MotRPM: 168, Odo: 6961km
 01246     04/28/2017 14:54:43   Batt Dischg Cur Limited    407 A (78%), MinCell: 3599mV, MaxPackTemp: 40C
 01247     04/28/2017 14:55:43   Riding                     PackTemp: h 40C, l 40C, PackSOC: 36%, Vpack:100.769V, MotAmps:   0, BattAmps:   1, Mods: 11, MotTemp:  69C, CtrlTemp:  40C, AmbTemp:  35C, MotRPM:2586, Odo: 6961km
 01248     04/28/2017 14:55:43   Batt Dischg Cur Limited    405 A (77%), MinCell: 3587mV, MaxPackTemp: 40C
 01249     04/28/2017 14:56:43   Riding                     PackTemp: h 40C, l 40C, PackSOC: 35%, Vpack:100.511V, MotAmps:   0, BattAmps:   2, Mods: 11, MotTemp:  69C, CtrlTemp:  40C, AmbTemp:  35C, MotRPM:2620, Odo: 6962km
 01250     04/28/2017 14:56:43   Batt Dischg Cur Limited    392 A (75%), MinCell: 3579mV, MaxPackTemp: 40C
 01251     04/28/2017 14:57:43   Riding                     PackTemp: h 40C, l 40C, PackSOC: 35%, Vpack:100.973V, MotAmps:   0, BattAmps:   0, Mods: 11, MotTemp:  71C, CtrlTemp:  39C, AmbTemp:  35C, MotRPM:   0, Odo: 6963km
 01252     04/28/2017 14:57:43   Batt Dischg Cur Limited    404 A (77%), MinCell: 3596mV, MaxPackTemp: 40C
 01253     04/28/2017 14:58:43   Riding                     PackTemp: h 40C, l 40C, PackSOC: 35%, Vpack:100.485V, MotAmps:  22, BattAmps:  14, Mods: 11, MotTemp:  68C, CtrlTemp:  40C, AmbTemp:  35C, MotRPM:2179, Odo: 6963km
 01254     04/28/2017 14:58:43   Batt Dischg Cur Limited    406 A (78%), MinCell: 3568mV, MaxPackTemp: 40C
 01255     04/28/2017 14:59:43   Riding                     PackTemp: h 40C, l 40C, PackSOC: 34%, Vpack:100.631V, MotAmps:   0, BattAmps:   0, Mods: 11, MotTemp:  68C, CtrlTemp:  40C, AmbTemp:  35C, MotRPM:2363, Odo: 6964km
 01256     04/28/2017 14:59:43   Batt Dischg Cur Limited    395 A (75%), MinCell: 3583mV, MaxPackTemp: 40C
 01257     04/28/2017 15:00:43   Riding                     PackTemp: h 40C, l 40C, PackSOC: 34%, Vpack: 99.788V, MotAmps:  38, BattAmps:  33, Mods: 11, MotTemp:  68C, CtrlTemp:  39C, AmbTemp:  34C, MotRPM:2941, Odo: 6965km
 01258     04/28/2017 15:00:43   Batt Dischg Cur Limited    393 A (75%), MinCell: 3553mV, MaxPackTemp: 40C
 01259     04/28/2017 15:01:43   Riding                     PackTemp: h 40C, l 40C, PackSOC: 33%, Vpack:100.450V, MotAmps:   0, BattAmps:   1, Mods: 11, MotTemp:  67C, CtrlTemp:  39C, AmbTemp:  34C, MotRPM:2157, Odo: 6966km
 01260     04/28/2017 15:01:43   Batt Dischg Cur Limited    391 A (75%), MinCell: 3577mV, MaxPackTemp: 40C
 01261     04/28/2017 15:02:43   Riding                     PackTemp: h 40C, l 40C, PackSOC: 33%, Vpack:100.788V, MotAmps:   0, BattAmps:   0, Mods: 11, MotTemp:  67C, CtrlTemp:  38C, AmbTemp:  34C, MotRPM:   0, Odo: 6966km
 01262     04/28/2017 15:02:43   Batt Dischg Cur Limited    400 A (76%), MinCell: 3590mV, MaxPackTemp: 40C
 01263     04/28/2017 15:03:43   Riding                     PackTemp: h 40C, l 40C, PackSOC: 33%, Vpack:100.826V, MotAmps:   0, BattAmps:   0, Mods: 11, MotTemp:  64C, CtrlTemp:  38C, AmbTemp:  35C, MotRPM:1069, Odo: 6966km
 01264     04/28/2017 15:03:43   Batt Dischg Cur Limited    403 A (77%), MinCell: 3592mV, MaxPackTemp: 40C
 01265     04/28/2017 15:04:43   Riding                     PackTemp: h 40C, l 40C, PackSOC: 33%, Vpack:100.874V, MotAmps:  36, BattAmps:   1, Mods: 11, MotTemp:  65C, CtrlTemp:  38C, AmbTemp:  35C, MotRPM: 154, Odo: 6966km
 01266     04/28/2017 15:04:43   Batt Dischg Cur Limited    404 A (77%), MinCell: 3595mV, MaxPackTemp: 40C
 01267     04/28/2017 15:05:43   Riding                     PackTemp: h 40C, l 40C, PackSOC: 33%, Vpack:100.311V, MotAmps:  19, BattAmps:  13, Mods: 11, MotTemp:  68C, CtrlTemp:  40C, AmbTemp:  35C, MotRPM:1845, Odo: 6967km
 01268     04/28/2017 15:05:43   Batt Dischg Cur Limited    397 A (76%), MinCell: 3568mV, MaxPackTemp: 40C
 01269     04/28/2017 15:06:43   Riding                     PackTemp: h 40C, l 40C, PackSOC: 32%, Vpack:101.043V, MotAmps: -59, BattAmps: -20, Mods: 11, MotTemp:  67C, CtrlTemp:  40C, AmbTemp:  35C, MotRPM:1407, Odo: 6967km
 01270     04/28/2017 15:06:43   Batt Dischg Cur Limited    397 A (76%), MinCell: 3584mV, MaxPackTemp: 40C
 01271     04/28/2017 15:07:43   Riding                     PackTemp: h 40C, l 40C, PackSOC: 32%, Vpack:100.156V, MotAmps:  37, BattAmps:  19, Mods: 11, MotTemp:  68C, CtrlTemp:  40C, AmbTemp:  35C, MotRPM:1666, Odo: 6968km
 01272     04/28/2017 15:07:43   Batt Dischg Cur Limited    392 A (75%), MinCell: 3564mV, MaxPackTemp: 40C
 01273     04/28/2017 15:08:26   WARNING: Max allowed voltage difference is 500mV
 01274     04/28/2017 15:08:28   WARNING: Max allowed voltage difference is 500mV
 01275     04/28/2017 15:08:28   WARNING: Max allowed voltage difference is 500mV
 01276     04/28/2017 15:08:28   WARNING: Max allowed voltage difference is 500mV
 01277     04/28/2017 15:08:43   Riding                     PackTemp: h 40C, l 40C, PackSOC: 31%, Vpack:100.105V, MotAmps:   0, BattAmps:   0, Mods: 11, MotTemp:  77C, CtrlTemp:  41C, AmbTemp:  34C, MotRPM: 275, Odo: 6969km
 01278     04/28/2017 15:08:43   Batt Dischg Cur Limited    358 A (68%), MinCell: 3565mV, MaxPackTemp: 40C
 01279     04/28/2017 15:09:43   Riding                     PackTemp: h 40C, l 40C, PackSOC: 30%, Vpack:100.255V, MotAmps:   0, BattAmps:   1, Mods: 11, MotTemp:  74C, CtrlTemp:  40C, AmbTemp:  34C, MotRPM:1632, Odo: 6969km
 01280     04/28/2017 15:09:43   Batt Dischg Cur Limited    382 A (73%), MinCell: 3571mV, MaxPackTemp: 40C
 01281     04/28/2017 15:10:43   Riding                     PackTemp: h 40C, l 40C, PackSOC: 30%, Vpack:100.075V, MotAmps:   0, BattAmps:   2, Mods: 11, MotTemp:  71C, CtrlTemp:  40C, AmbTemp:  34C, MotRPM:2008, Odo: 6970km
 01282     04/28/2017 15:10:43   Batt Dischg Cur Limited    385 A (74%), MinCell: 3563mV, MaxPackTemp: 40C
 01283     04/28/2017 15:11:34   DEBUG: Module scheme changed from Running mode to Stopped mode
 01284     04/28/2017 15:11:34   DEBUG: Module mode Change Does Not Require Disconnect
 01285     04/28/2017 15:11:37   Power Off                  Key Switch
 01286     04/28/2017 15:11:37   Sevcon Turned Off
 01287     04/28/2017 15:11:37   Module 00 Opening Contactor  vmod: 100.392V, batt curr:   0A
 01288     04/28/2017 15:11:37   Module 01 Opening Contactor  vmod: 100.408V, batt curr:   0A
 01289     04/28/2017 15:11:37   INFO:  Disabling External Chg 0 Charger 2
 01290     04/28/2017 15:11:37   INFO:  Disabling External Chg 1 Charger 3
 01291                       0   DEBUG: Reset: Power-On, External
 01292                       0   Power On                   Onboard Charger
 01293                       0   Calex 720W Charger 0 Connected   
 01294                       0   Calex 1200W Charger 1 Connected   
 01295                       0   DEBUG: Module scheme changed from None mode to Charging mode
 01296                       0   Module 00 Opening Contactor  vmod:   0.000V, batt curr:   0A
 01297                       0   Module 01 Opening Contactor  vmod:   0.000V, batt curr:   0A
 01298                       0   Module 00 CAN Link Up
 01299                       0   Module 00 Registered       serial: 16sg2654,  vmod: 100.490V
 01300     04/28/2017 15:12:02   Module 01 Registered       serial: 16sg2651,  vmod: 100.483V
 01301     04/28/2017 15:12:07   Module 01 CAN Link Up
 01302     04/28/2017 15:12:07   Module 01 CAN Link Down
 01303     04/28/2017 15:12:07   Sevcon Turned On
 01304     04/28/2017 15:12:07   Module 01 CAN Link Up
 01305     04/28/2017 15:12:08   CAN1 BIT0 error. count=1
 01306     04/28/2017 15:12:08   Sevcon CAN Link Up
 01307     04/28/2017 15:12:08   DEBUG: Sevcon Contactor Drive ON.
 01308     04/28/2017 15:12:08   Module 00 Closing Contactor  vmod: 100.490V, maxsys: 100.479V, minsys: 100.475V, diff: 0.004V, vcap: 90.000V, prechg: 89%
 01309     04/28/2017 15:12:08   Module 01 Closing Contactor  vmod: 100.489V, maxsys: 100.479V, minsys: 100.475V, diff: 0.004V, vcap: 90.000V, prechg: 89%
 01310     04/28/2017 15:12:08   DEBUG: Module 01 Contactor is now Closed
 01311     04/28/2017 15:12:08   INFO:  Enabling Calex 720W Charger 0
 01312     04/28/2017 15:12:08   INFO:  Enabling Calex 1200W Charger 1
 01313     04/28/2017 15:12:08   INFO:  Enabling External Chg 0 Charger 2
 01314     04/28/2017 15:12:08   INFO:  Enabling External Chg 1 Charger 3
 01315     04/28/2017 15:12:08   DEBUG: Module 00 Contactor is now Closed
 01316     04/28/2017 15:12:16   Charging                   PackTemp: h 40C, l 40C, AmbTemp: 34C, PackSOC: 30%, Vpack:100.630V, BattAmps:  -4, Mods: 11, MbbChgEn: Yes, BmsChgEn: No




« Last Edit: April 29, 2017, 09:15:09 AM by domingo3 »
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Lenny

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Re: WARNING: Max allowed voltage difference is 500mV
« Reply #1 on: April 30, 2017, 12:50:03 AM »

I don't think that the 500mV warning refers to a difference in cell voltage, as it would be way to much and should never happen under normal circumstances. Only case I could imagine would be a very faulty cell close to dying.

I think it could refer to the voltage difference over the contactor. The MBB/BMS can measure voltage on both sides of it to determine whether precharging of the controller is sufficient to close the contactor without having to much inrush current and sparking inside the contactor. By the time or due to bad manufacturing a contactor could see some wear, which raises its resistance. A higher resistance causes a higher voltage drop under load, which is then detected by the MBB/BMS measurements and an indicator for the wear of the contactor.

Regarding the discharge current limit I don't think there's anything unusual. The small packs (6.5) will always be more prone to that, simply due to the fact that the same amount of power demand from a smaller pack with less cells causes a higher voltage drop compared to a big pack (13). Still around 70 % of current with 30% SOC seems excellent for me, I've seen much worse values in my logs. Temperature seems to have a huge impact on that, your pack with 40°C will be very close to the performance optimum.
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MajorMajor

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Re: WARNING: Max allowed voltage difference is 500mV
« Reply #2 on: April 30, 2017, 04:49:00 PM »

Is there anything in the 2 BMS logs?
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domingo3

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Re: WARNING: Max allowed voltage difference is 500mV
« Reply #3 on: May 03, 2017, 06:10:24 AM »

I don't know what I'd look for, but I don't see anything of note that correlates in the BMS logs.
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