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State of Charge

930 bytes added, 00:25, 1 July 2020
cleanup and update
; Concepts
: SoC is a porportional representation; a percentage (fraction), so it is only applicable with a '''known total''' or max.
: Riders all have experienced different ranges under different temperatures, various environmental conditions etc.
: So ''full'' is really a subjective term, like asking ''when When is a ballon balloon full? Before it pops? But if you fill it with cold air then move to a warm environment, it pops''.
:* Paraphrase of [http://electricmotorcycleforum.com/boards/index.php?topic=8052.msg68226#msg68226 ElectricZen's explanation]
: SoC is most easily calibrated using the battery pack's voltage at rest or near rest.
: {{:Battery Voltage}}
; (Obsolete) SoC Indications [http://electricmotorcycleforum.com/boards/index.php?topic=5527.msg40219#msg40219 per protomech]:* The : Before Zero removed pack capacity readout from the [[Official_Mobile_ApplicationOfficial Mobile Application#Statistics_Mode|mobile app]] appears , there were some corroborating indications available:* The app appeared to simply show kWh using Zero's max capacity rating, i.e. present voltage times present amp hours.* The voltage and amp-hours are were likely to be correct, but the kWh readout is was a rough guide at best.* The percentage reading adjusts adjusted to the estimated pack maximum over time, so if as the pack agesaged, the reported Ah and kWh readout will would decrease, but not the maximum percentage.
; Variance across Battery Pack Years
: * The sensors sensor equipment measuring current and temperature for the battery pack improve over the years, impacting SoC indication.*: 2017 model year bikes appear to have an increased range of current sensor calibration quality, improving that year's estimations.* Cell behavior also varies over the years, generally improving in robustness.*: One can find multiple complaints of going into limp-home mode at 5-15% from 2014 SR owners, for example. ; Variance by riding conditions* Cell discharge is an electrochemical process that depends on the cells' physical conditions.* The resistance of the cell (which should be low) increases with environmental factors like temperature.*: 2017 model year bikes appear to have This results in reduced performance, since the resistance lowers the terminal voltage of the cells and the overall battery pack.* At low SoC values, SoC might drop considerably once the BMS observes low terminal voltage as an increased range indirect result of current sensor calibration qualitylow temperatures or a cell imbalance.*: The lowest-performing cell becomes the limiting factor in pack performance at low voltage / SoC, improving that year's estimationsand Zero does not provide indications to help you anticipate or diagnose this.
; Other References

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