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[Auriga]

1. That should be available from the regular old menu you get from the obd
2. Unknown. BMS2 is just your first BMS and not referring to login levels. Zero has told us that the new platform no longer uses fixed passwords, and requires you to talk to their servers. So it seems unlikely users will be able to get into these bikes unless someone cracks the process.

[Gary]

Hi Auriga,

Thanks for the information.  I definitely cannot get to the cell voltages from the current menu.  I guess there are undisclosed commands that would access this information, perhaps known only to the 'authorised' dealers.  It has always annoyed me that the automotive, etc, industries keep useful information from their customers.

Regards

Gary

[Auriga]

One more thing

The bms command listed below with the cell voltages was run on a 2014 bike. I think you have an SRF or SRS, the OS and commands are completely different.
Someone documented available commands on the MBB for that bike here:
https://zeromanual.com/wiki/Gen3/MBB_Console

I think you can get cell voltages by connecting to the BMS though via the status or stats command. But to do that on an SRF you have to remove the grey panel on the front of the battery behind the front wheel and on SRS you have to do that and remove a bunch of plastics. And t he connector is different.

[Hans2183]

Indeed I can't recall voltage per cell reports on my SRF so probably another platform.

[stevenh]

Not thrilled with my capacity at 96AH at 8000 miles.  Balance does not look too bad.  I usually run at 80 or 85% max charge, I wonder if that has any effect on the reported AH?

Steve

ZERO MBB> bms interface
BMS 2 interface data:

 - status 0x80000036
 - status2 0x0000
- pack_current_ma -106
 - time since status_rpdo_received 315573

 - max_charge_voltage 117.6 V
 - target_charge_voltage 109.8 V
 - pack_soc_pct 76
 - discharge_allowed 60
 - max_charge_current 84
 - max_discharge_current 780
 - time since power_rpdo_received 315577

 - pack_capacity_ah 96
 - min_pack_temp_c 12
 - max_pack_temp_c 13
 - lowest_cell_voltage_mv 3855
 - time since pack_rpdo_received 315577

 - pack_open_circuit_voltage_mv 108003
 - pack_voltage_mv 108003
 - time since voltage_rpdo_received 315578
 - Contactor recently closed 0

 - bms_compatibility_field 0x03

[Hans2183]

my last readout was very disappointing

at ODO 11.300 km just before the charge tank debacle I had this readout (firmware version 17)

Code: [Select]


- max_charge_voltage 117.6 V
- target_charge_voltage 109.8 V
- pack_soc_pct 72
- discharge_allowed 87
- max_charge_current 128
- max_discharge_current 1120
- time since power_rpdo_received 10

- pack_capacity_ah 112
- min_pack_temp_c 25
- max_pack_temp_c 26
- lowest_cell_voltage_mv 3811
- time since pack_rpdo_received 27
now at ODO 13.299 km only (firmware version 19)

Code: [Select]

- max_charge_voltage 117.6 V
- target_charge_voltage 110.3 V
- pack_soc_pct 72
- discharge_allowed 56
- max_charge_current 76
- max_discharge_current 728
- time since power_rpdo_received 49

- pack_capacity_ah 98
- min_pack_temp_c 11
- max_pack_temp_c 12
- lowest_cell_voltage_mv 3812
- time since pack_rpdo_received 59
Bike has been sitting at 64% most of the time, after that used within 20-80% limits and kept at around 70% when not in use. Well nothing different from the first readout. Balance seems very similar. Pack temp is quite different.

I'll do a new readout after some charges.

[stevenh]

Similar mileage, much lower AH.   

Steve

****************************************
*               Bike Status            *
****************************************


 Bike State: STOP

 Key       : ON
 Kickstand : DOWN
 Kill SW   : RUN
 Charger   : DISCONNECTED
 Amb Temp  : 14 C
 12V batt  : 13096 mV

 Bike Control: 0x4036
 Bike Disable: 0x00

* * * BATTERY INFO * * *

 BMS | SOC |  Pack V  | Current | Capacity|  L cell  | H temp | L temp | Cont | Elig
 ----+-----+----------+---------+---------+----------+--------+--------+------+------+
   2   87 %  111378 mV  53 mA     96 AH    3975 mV    14 C    13 C      +     +

* * * CONTROLLER * * *
 Motor RPM:             0 rpm
 Motor Temperature:     17 C
 DC Bus Voltage:        111500 mV
 Fault Code:            0 level- 0
 Last time Temp PDO     20 s, 451000 us

* * * CHARGER INFO * * *
 - No chargers registered.

* * * DASH . TCS * * *
 Odometer:      11351 km
 Ride Mode:     Custom
 Traction Mode: Street

* * * FAULTS and DISABLES * * *
Active faults:


Pending faults:

[stevenh]

Sorry Hans, I did not see the second set of data.  I guess we line up pretty well, but both lower than we'd expect.

Steve

Similar mileage, much lower AH.   

Steve

****************************************
*               Bike Status            *
****************************************


 Bike State: STOP

 Key       : ON
 Kickstand : DOWN
 Kill SW   : RUN
 Charger   : DISCONNECTED
 Amb Temp  : 14 C
 12V batt  : 13096 mV

 Bike Control: 0x4036
 Bike Disable: 0x00

* * * BATTERY INFO * * *

 BMS | SOC |  Pack V  | Current | Capacity|  L cell  | H temp | L temp | Cont | Elig
 ----+-----+----------+---------+---------+----------+--------+--------+------+------+
   2   87 %  111378 mV  53 mA     96 AH    3975 mV    14 C    13 C      +     +

* * * CONTROLLER * * *
 Motor RPM:             0 rpm
 Motor Temperature:     17 C
 DC Bus Voltage:        111500 mV
 Fault Code:            0 level- 0
 Last time Temp PDO     20 s, 451000 us

* * * CHARGER INFO * * *
 - No chargers registered.

* * * DASH . TCS * * *
 Odometer:      11351 km
 Ride Mode:     Custom
 Traction Mode: Street

* * * FAULTS and DISABLES * * *
Active faults:


Pending faults:

[Hans2183]

The demo bike that I rolled over 1.000 km ODO had 106Ah from what I recall. So these values are all over the place. Really curious if a few more read outs will show any difference. I'll keep you posted.

[NervEasy]

Ex demo now my bike has 101Ah at 2200km. Now at 3500 will again check when possible.

[NervEasy]

I have a feeling this value is part of the problem. The bike doesn't really exactly know how much it can hold and estimates while riding using the wrong Ah value. Then when stopped it falls back to voltage measurement when the pack has stabilized (this is a good measure of % when batt is under no load). Which paints a totally different picture so the bike "magically" adjusts it's SoC.

When fully discharged and charged you can kinda reset this parameter so the magic recharging is less pronounced.

Just speculation...

[Hans2183]

did some more readouts today but no change in Ah so far

unused for a few days, showing 68% SOC on dash (70 in system)

Code: [Select]

- max_charge_voltage 117.6 V
- target_charge_voltage 110.3 V
- pack_soc_pct 70
- discharge_allowed 61
- max_charge_current 92
- max_discharge_current 792
- time since power_rpdo_received 64

- pack_capacity_ah 98
- min_pack_temp_c 14
- max_pack_temp_c 15
- lowest_cell_voltage_mv 3793
- time since pack_rpdo_received 74

- pack_open_circuit_voltage_mv 106305
- pack_voltage_mv 106299
then let it charge up to 100% using a 220V adapter and waiting for it to stop charging (so balanced)

Code: [Select]

- max_charge_voltage 117.6 V
- target_charge_voltage 110.3 V
- pack_soc_pct 100
- discharge_allowed 91
- max_charge_current 56
- max_discharge_current 1168
- time since power_rpdo_received 58

- pack_capacity_ah 98
- min_pack_temp_c 17
- max_pack_temp_c 19
- lowest_cell_voltage_mv 4137
- time since pack_rpdo_received 68

- pack_open_circuit_voltage_mv 115956
- pack_voltage_mv 115956
And next is after riding it down to 38% (on dash, 40% according to BMS)

Code: [Select]

- max_charge_voltage 117.6 V
- target_charge_voltage 110.3 V
- pack_soc_pct 42
- discharge_allowed 45
- max_charge_current 108
- max_discharge_current 588
- time since power_rpdo_received 112

- pack_capacity_ah 98
- min_pack_temp_c 17
- max_pack_temp_c 20
- lowest_cell_voltage_mv 3629
- time since pack_rpdo_received 0

- pack_open_circuit_voltage_mv 101681
- pack_voltage_mv 101709
And even after charging it back up no difference in that Ah number reported.

[Hans2183]

In better news riding beyond 0% does actually calibrate the system and we do get higher numbers after doing so. I'll make a follow up later on with actual numbers but this is already a quick explanation.

[Crissa]

More accurate range display... or longer battery pack life.  What a choice.  I suppose a few excursions to zero over a pack's life (with immediate recharging) wouldn't be so bad.  And if it kept your display mire accurate, you could avoid over/under charging better.

-Crissa