ElectricMotorcycleForum.com

Makes And Models => Zero Motorcycles Forum | 2013+ => Topic started by: xmjsilverx on June 04, 2015, 05:34:17 PM

Title: Power at lower SOC
Post by: xmjsilverx on June 04, 2015, 05:34:17 PM

I am pretty positive I can tell there is a loss of power at lower states of charge on my SR.  Hitting the throttle at 40mph at 38% doesn't seem to take off like a rocket as it usually does.  Does anyone have any data for this?  I'd be interested in a graph of 0-60 times through out the SOC.  I assume the graph would look similar to how most lipo's perform  Very small losses until the battery is down to 10-20% or so.

Title: Re: Power at lower SOC
Post by: evtricity on June 04, 2015, 05:42:56 PM

You are absolutely correct, the Main Bike Board reduces the torque by sending messages to the Sevcon controller when the battery level moves under 40% or so. It reduces further as the charge rate drops. You can change this using the Sevcon software.

Title: Re: Power at lower SOC
Post by: Justin Andrews on June 04, 2015, 05:51:56 PM

If you can access your logs, you'll see that the power reduction is written to the logs as well.

This is what a log looks like when you've ridden to the end of your SOC. ;)

03257     01/29/2015 10:03:26   Riding                     PackTemp: h  9C, l  8C, PackSOC: 10%, Vpack: 92.723V, MotAmps:  30, BattAmps:  10, Mods: 10, MotTemp:  17C, CtrlTemp:   5C, MotRPM:1196
 03258     01/29/2015 10:03:26   Batt Dischg Cur Limited    485 A
 03260     01/29/2015 10:04:26   Riding                     PackTemp: h  9C, l  8C, PackSOC: 10%, Vpack: 92.120V, MotAmps:  39, BattAmps:  11, Mods: 10, MotTemp:  18C, CtrlTemp:   5C, MotRPM: 966
 03261     01/29/2015 10:04:26   Batt Dischg Cur Limited    413 A
 03262     01/29/2015 10:05:26   Riding                     PackTemp: h  9C, l  8C, PackSOC: 10%, Vpack: 93.382V, MotAmps:   7, BattAmps:   1, Mods: 10, MotTemp:  18C, CtrlTemp:   5C, MotRPM:1096
 03263     01/29/2015 10:05:26   Batt Dischg Cur Limited    439 A
 03264     01/29/2015 10:06:26   Riding                     PackTemp: h  9C, l  8C, PackSOC: 10%, Vpack: 92.054V, MotAmps:  30, BattAmps:  10, Mods: 10, MotTemp:  18C, CtrlTemp:   4C, MotRPM:1372
 03265     01/29/2015 10:06:26   Batt Dischg Cur Limited    444 A
 03266     01/29/2015 10:07:26   Riding                     PackTemp: h  9C, l  8C, PackSOC: 10%, Vpack: 92.518V, MotAmps:   4, BattAmps:   1, Mods: 10, MotTemp:  18C, CtrlTemp:   4C, MotRPM:1240
 03267     01/29/2015 10:07:26   Batt Dischg Cur Limited    421 A
 03268     01/29/2015 10:08:26   Riding                     PackTemp: h  9C, l  8C, PackSOC: 10%, Vpack: 90.639V, MotAmps:  42, BattAmps:  15, Mods: 10, MotTemp:  18C, CtrlTemp:   4C, MotRPM:1282
 03269     01/29/2015 10:08:26   Batt Dischg Cur Limited    331 A
 03270     01/29/2015 10:09:26   Riding                     PackTemp: h  9C, l  8C, PackSOC:  9%, Vpack: 91.547V, MotAmps:  40, BattAmps:  13, Mods: 10, MotTemp:  19C, CtrlTemp:   4C, MotRPM:1272
 03271     01/29/2015 10:09:26   Batt Dischg Cur Limited    325 A
 03272     01/29/2015 10:10:26   Riding                     PackTemp: h  9C, l  8C, PackSOC:  9%, Vpack: 90.960V, MotAmps:  32, BattAmps:   9, Mods: 10, MotTemp:  19C, CtrlTemp:   4C, MotRPM:1128
 03273     01/29/2015 10:10:26   Batt Dischg Cur Limited    314 A
 03274     01/29/2015 10:11:26   Riding                     PackTemp: h  9C, l  8C, PackSOC:  9%, Vpack: 90.161V, MotAmps:  26, BattAmps:   9, Mods: 10, MotTemp:  19C, CtrlTemp:   4C, MotRPM:1200
 03275     01/29/2015 10:11:26   Batt Dischg Cur Limited    199 A
 03276     01/29/2015 10:12:26   Riding                     PackTemp: h  9C, l  8C, PackSOC:  9%, Vpack: 90.203V, MotAmps:  35, BattAmps:  11, Mods: 10, MotTemp:  20C, CtrlTemp:   4C, MotRPM:1124
 03277     01/29/2015 10:12:26   Batt Dischg Cur Limited    276 A
 03278     01/29/2015 10:13:26   Riding                     PackTemp: h  9C, l  8C, PackSOC:  9%, Vpack: 88.691V, MotAmps:  36, BattAmps:  12, Mods: 10, MotTemp:  19C, CtrlTemp:   4C, MotRPM:1126
 03279     01/29/2015 10:13:26   Batt Dischg Cur Limited     89 A
 03280     01/29/2015 10:14:16   Low Chassis Isolation      31 KOhms to cell 1
 03281     01/29/2015 10:14:26   Riding                     PackTemp: h  9C, l  8C, PackSOC:  8%, Vpack: 88.887V, MotAmps:  28, BattAmps:  10, Mods: 10, MotTemp:  20C, CtrlTemp:   4C, MotRPM:1332
 03282     01/29/2015 10:14:26   Batt Dischg Cur Limited     86 A
 03283     01/29/2015 10:15:26   Riding                     PackTemp: h  9C, l  8C, PackSOC:  8%, Vpack: 87.395V, MotAmps:  33, BattAmps:  11, Mods: 10, MotTemp:  20C, CtrlTemp:   4C, MotRPM:1146
 03284     01/29/2015 10:15:26   Batt Dischg Cur Limited     30 A
 03285     01/29/2015 10:16:05   BMS Disable - Low Bat      pack sum: 85240 mV, capacity: 0%, module: 0, status: 0x0330
 03286     01/29/2015 10:16:05   High Throttle Disable.     thr   = 2187 mV
 03287     01/29/2015 10:16:26   Riding                     PackTemp: h  9C, l  8C, PackSOC:  0%, Vpack: 87.265V, MotAmps:  32, BattAmps:  11, Mods: 10, MotTemp:  21C, CtrlTemp:   4C, MotRPM:1156
 03288     01/29/2015 10:16:26   Batt Dischg Cur Limited     30 A
 03289     01/29/2015 10:16:44   BMS Disable - Low Bat      pack sum: 85653 mV, capacity: 0%, module: 0, status: 0x0330
 03290     01/29/2015 10:16:44   High Throttle Disable.     thr   = 2015 mV

Title: Re: Power at lower SOC
Post by: Cortezdtv on June 04, 2015, 06:41:33 PM

Your first acceleration when the motor is cold will also be the fastest. Once the motor is warm it automatically lowers power  to not over heat the motors.

Title: Re: Power at lower SOC
Post by: xmjsilverx on June 05, 2015, 03:10:06 AM

Ok, thanks for the info guys.