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[Doctorbass]

As we know the clel balance represent the voltage diff between the lowest and the highest cell voltage in a battery.

However i just wonder if  for the power tank user, that this cell balance result is calculated from BOTH of the Main battery and the powertank?

Ex: If the lowest cell voltage of the main battery pack is let say 4.135V and the highest is 4.138V
and that the power tank brick have the lowest  4.132V and the highest is 4.137V

Will the cell balance be the diff between 4.138 and 4.132V ( 6mV) ?

I just can't find the info about that.

Doc

[togo]

if you have access to the mbb console, you can run the "bms" command, see if it reports status separately.

i'm told the architecture of the Zero mbb platform to date supports up to two battery subsystems.  I.e. an X platform bike with two modules or an S platform bike with a monolith and a powertank.

[BrianTRice@gmail.com]

My speculative guess is:

• Overall voltage would be the minimum of the two batteries. Of course, they're electrically connected and maybe there's just a single bus measurement that the MBB uses separate from each BMS.
• Cell balance would be a maximum of each BMS' cell balance figures (which are maximums). I wouldn't expect the MBB to read the highest and lowest cells from each BMS and then calculate cell balance of them all together, but maybe it does! I don't know whether that'd mean anything for battery management or be confusing, because cell balancing has to happen per-pack.

Corrections welcome.

[togo]

> > if you have access to the mbb console, you can run the "bms" command, see if it reports status separately.
> >
> > i'm told the architecture of the Zero mbb platform to date supports up to two battery subsystems.  ...

> My speculative guess is...

Anyone out there have a diginow reaper/dongle *and* a powertank?  Or a diginow dongle and a two-brick X platform bike?

Would you be willing to capture the output of "bms" and post it?  Remove VIN and any other sensitive info before posting, of course...

[Justin Andrews]

> > if you have access to the mbb console, you can run the "bms" command, see if it reports status separately.
> >
> > i'm told the architecture of the Zero mbb platform to date supports up to two battery subsystems.  ...

> My speculative guess is...

Anyone out there have a diginow reaper/dongle *and* a powertank?  Or a diginow dongle and a two-brick X platform bike?

Would you be willing to capture the output of "bms" and post it?  Remove VIN and any other sensitive info before posting, of course...

SR-2015 with powertank (recorded early this year when I was doing some diagnostics after my bike was recovered after its theft)
Monolith is BMS #0
Powertank is BMS #1

****************************************
*               BMS Data               *
****************************************

*************  BMS #0  ***************
  - BMS Board Rev             :  03
  - BMS Firmware Rev          :  37
  - BMS Serial Number         : 2015_bms_03b9fc_00770
  - Battery Serial Number     : 15qd0574
  - CAN Rx in last second     :   74

  - Pack SOC                  :  49%
  - Fuel Gauge                :  47%
  - Age of SOC Data           :  20 ms

  - Model Year                : 2015
  - Pack Capacity             : 100 AH
  - Pack Capacity Remaining   :  48 AH
  - Total Energy Used         : 366 KWH
  - Number Of Bricks          :   4

  - Pack Discharge Current    :   2 A
  - Pack Sum Voltage          :  102.203 V
  - Sag-Adj Pack Sum Voltage  :  102.263 V
  - Bank Voltages             :     1    2    3    4    5    6    7    8    9   10   11   12   13   14   15   16   17   18   19   20   21   22   23   24   25   26   27   28
                              :  3647 3650 3649 3649 3650 3651 3649 3650 3651 3652 3650 3649 3648 3650 3649 3650 3650 3651 3649 3651 3652 3651 3652 3650 3650 3651 3651 3650
  - Lowest Cell Voltage       :  3647 mV ( Cell 1 )
  - Highest Cell Voltage      :  3652 mV ( Cell 10 )
  - Pack Balance              :  5 mV
  - Lowest Cell mV            :  3647 mV
  - Age of Bank Voltage Data  :  238 ms

  - Isolation Resistance      :  1413 KOhms (0x0585)
  - Least Isolated Cell       :  0
  - Instant Iso Resistance    :  -13 KOhms (0xFFFFFFF3)
  - Instant Least Iso Cell    :  0

                              :      0     1     2     3     4     5     6     7
  - Pack Temps                :     7C    6C    6C    7C    7C    7C    7C    7C
  - Lowest Present Pack Temp  :  6 C
  - Max Pack Temp This Ride   :  7 C
  - Min Pack Temp This Ride   :  6 C
  - Age of BMS Temp Data      :  90 ms

  - Min Discharge Temp        :  -30 C
  - Max Charge Temp           :  50 C
  - Min Charge Temp           :  0 C
  - Max Charge C-Rate         :  1.0
  - Min Discharge C-Rate      :  7.5
  - Discharge Scale Value     :   227/255

  - Num Charge Cycles         :  225

  - BMS Total Bike Run Time   :  00:02:00
  - BMS Clock                 :  01/02/2017 05:31:57 ( 1483360317, 0x586A483D )
  - Age of BMS Time Data      :  206 ms

  - Age of BMS Status Data    :  219 ms
  - Discrete Throttle En      :  Enabled

  CAN Status
  - Charger Attached          :   No
  - Batt Unbalanced           :   No
  - Batt Low                  :   No
  - Batt Full                 :   No
  - Batt Critically Low       :   No
  - Batt Temp High            :   No
  - Batt Temp Critically High :   No
  - Batt Temp Low             :   No
  - Contactor Closed          :  Yes
  - Isolation Fault           :   No
  - BMS Internal Fault        :   No
  - Cell Too High For Charge  :   No
  - Cell Too Low For Charge   :   No
  - Charge Halt               :   No
  - BMS Internal Disable      :   No

  CAN Commands
  - Close Contactor           :   No
  - Connect Module            :  Yes
  - Key On                    :  Yes
  - Charger Connected         :   No
  - Expected Charger Current  :  N/A
  - Time Since Cmds Last Sent : 1986 ms

*************  BMS #1  ***************
  - BMS Board Rev             :  03
  - BMS Firmware Rev          :  37
  - BMS Serial Number         : 2015_bms_0386e1_01926
  - Battery Serial Number     : 15sg1599
  - CAN Rx in last second     :   77

  - Pack SOC                  :  49%
  - Fuel Gauge                :  47%
  - Age of SOC Data           :  56 ms

  - Model Year                : 2015
  - Pack Capacity             :  22 AH
  - Pack Capacity Remaining   :  10 AH
  - Total Energy Used         :  78 KWH
  - Number Of Bricks          :   1

  - Pack Discharge Current    :   0 A
  - Pack Sum Voltage          :  102.189 V
  - Sag-Adj Pack Sum Voltage  :  102.189 V
  - Bank Voltages             :     1    2    3    4    5    6    7    8    9   10   11   12   13   14   15   16   17   18   19   20   21   22   23   24   25   26   27   28
                              :  3646 3652 3651 3652 3649 3651 3650 3641 3648 3652 3653 3653 3651 3652 3647 3649 3642 3652 3647 3653 3647 3647 3645 3650 3649 3656 3652 3647
  - Lowest Cell Voltage       :  3641 mV ( Cell 8 )
  - Highest Cell Voltage      :  3656 mV ( Cell 26 )
  - Pack Balance              :  14 mV
  - Lowest Cell mV            :  3642 mV
  - Age of Bank Voltage Data  :  291 ms

  - Isolation Resistance      :  1346 KOhms (0x0542)
  - Least Isolated Cell       :  0
  - Instant Iso Resistance    :  -26 KOhms (0xFFFFFFE6)
  - Instant Least Iso Cell    :  0

                              :      0     1     2     3     4     5     6     7
  - Pack Temps                :     7C    7C    7C    7C -100C -100C -100C -100C
  - Lowest Present Pack Temp  :  7 C
  - Max Pack Temp This Ride   :  7 C
  - Min Pack Temp This Ride   :  7 C
  - Age of BMS Temp Data      :  91 ms

  - Min Discharge Temp        :  -30 C
  - Max Charge Temp           :  50 C
  - Min Charge Temp           :  0 C
  - Max Charge C-Rate         :  1.0
  - Min Discharge C-Rate      : 10.0
  - Discharge Scale Value     :   224/255

  - Num Charge Cycles         :  231

  - BMS Total Bike Run Time   :  00:02:00
  - BMS Clock                 :  01/02/2017 05:32:16 ( 1483360336, 0x586A4850 )
  - Age of BMS Time Data      :  205 ms

  - Age of BMS Status Data    :  217 ms
  - Discrete Throttle En      :  Enabled

  CAN Status
  - Charger Attached          :   No
  - Batt Unbalanced           :   No
  - Batt Low                  :   No
  - Batt Full                 :   No
  - Batt Critically Low       :   No
  - Batt Temp High            :   No
  - Batt Temp Critically High :   No
  - Batt Temp Low             :   No
  - Contactor Closed          :  Yes
  - Isolation Fault           :   No
  - BMS Internal Fault        :   No
  - Cell Too High For Charge  :   No
  - Cell Too Low For Charge   :   No
  - Charge Halt               :   No
  - BMS Internal Disable      :   No

  CAN Commands
  - Close Contactor           :   No
  - Connect Module            :  Yes
  - Key On                    :  Yes
  - Charger Connected         :   No
  - Expected Charger Current  :  N/A
  - Time Since Cmds Last Sent : 2803 ms

[togo]

Thank you, Justin!

Got your answer, Doctorbass?

[Doctorbass]

Yes as well I also had checked on the MBS log from the ans saw that too.

What i find very curious is that the Powertank have alot higher IMBALANCE than the monolith(less than 5mV).
That's the same thing Justin get as me for the imbalance except i get 27mV imbalance...

I will check the powertank imbalance at various SOC for fun...

Btw the powertank sticker indicate 102V 28Ah and not 29Ah

i also had similar strange info on a 2015 monolith where it was still wrote 25Ah on the brick and not 27Ah...

Doc

[Richard230]

My recollection is that the power tank is using the same cell configuration as the previous Zero models and has not been updated to match the latest brick configuration that increased the electrical capacity of each brick slightly. Maybe they will do this for the 2108 models. 

[BrianTRice@gmail.com]

I made some wiki updates based on this:
http://zeromanual.com/index.php/Zero_Aftermarket#OEM_Power_Tank
http://zeromanual.com/index.php/Zero_Aftermarket#OEM_Power_Pack_Module