The old range question and some other weird thing

[Butch]

I have an EX with 17s and is an awesome supermoto and I live at the bottom of heaven.

anyho, Mt Hamilton rd is about 20 miles, 4K vertical and 400 turns to the top.
so the other day, I ride up there, keep it under 40 mph and have a bit less than 50% SOC indicated. Cool.

so I turn off the key, and fart around for a bit.
when I turn the key on the display shows about 30%. Uh?

i put it in mode 1 and was way mellow and made it home, blinky mode at about 38 miles. Home was 39.5.

still, big fun.

 

[Oded]

I also noticed some soc difference after I toggle the key on my EX, but not to that extreme.

 

[leeo45]

This SOC display situation was discussed in a thread a couple of years ago. One of the ex-ALTA guys described what was happening at a somewhat technical level. I interpreted that as the system recalibrates the measurement when you turn the key back on to a more accurate readout. I have seen it happen many times, although typcally only a one bar change. Unfortunately, I've never seen it go up; always recalibrates to show a lower SOC.

And nice picture.

 

[Caryder]

My EXR does the same thing, sometimes significantly different (a few bars instead of 1), and always lower when turned back on. I have also just eaked out 40 miles on asphalt but with little elevation change.

 

[Caryder]

Battery Energy State Hysteresis

I noticed that the battery energy state has a "hysteresis" behavior if you power cycle the bike while charging or discharging (i.e. riding.) This video shows examples of how you will "gain" energy when charging just by turning the key on/off and similarly you will "lose" energy if you do the...

electricdirtriders.com

 

[Rashid510]

This SOC display situation was discussed in a thread a couple of years ago. One of the ex-ALTA guys described what was happening at a somewhat technical level. I interpreted that as the system recalibrates the measurement when you turn the key back on to a more accurate readout. I have seen it happen many times, although typcally only a one bar change. Unfortunately, I've never seen it go up; always recalibrates to show a lower SOC.

And nice picture.

Thats exactly it. The BCU is reading the cell voltages via the BMS (LTC Chip on the module) There is a bit of voltage sag and when the bike fires up it does a re-calibration.