Difference between revisions of "State of Charge"
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| + | [[Wikipedia:State_of_charge|State of Charge]] is a calculation meant to help estimate remaining energy in the [[Battery]]. | ||
| + | |||
| + | ; Concepts | ||
| + | : SoC is a porportional representation; a 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 is a ballon 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}} | ||
| + | |||
| + | ; SoC Indications [http://electricmotorcycleforum.com/boards/index.php?topic=5527.msg40219#msg40219 per protomech]: | ||
| + | * The [[Official_Mobile_Application#Statistics_Mode|mobile app]] appears to simply show kWh using Zero's max capacity rating, i.e. present voltage times present amp hours. | ||
| + | * The voltage and amp-hours are likely to be correct, but the kWh readout is a rough guide at best. | ||
| + | * The percentage reading adjusts to the estimated pack maximum over time, so if the pack ages, the reported Ah and kWh readout will decrease, but not the maximum percentage. | ||
| + | |||
| + | ; Variance across Battery Pack Years | ||
| + | : The sensors measuring current and temperature for the battery pack improve over the years, impacting SoC indication. | ||
| + | : One can find multiple complaints of going into limp-home mode at 5-15% from 2014 SR owners, for example. | ||
| + | : 2017 model year bikes appear to have an increased range of current sensor calibration quality, improving that year's estimations. | ||
| + | |||
| + | ; Other References | ||
| + | : [http://electricmotorcycleforum.com/boards/index.php?topic=7283 Inaccurate SoC Estimate] | ||
| + | : [https://www.electric.motorcycles/post/how-oems-calculate-battery-capacity-and-why-it-s-not-totally-their-fault-they-are-wrong How OEMs calculate Battery Capacity, and why it's not totally their fault they are wrong by Brandon Nozaki Miller] | ||
| + | </onlyinclude> | ||
| + | |||
[[Category:Term]] | [[Category:Term]] | ||
| + | [[Category:Theory]] | ||
Latest revision as of 00:56, 5 December 2019
State of Charge is a calculation meant to help estimate remaining energy in the Battery.
- Concepts
- SoC is a porportional representation; a 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 is a ballon full? Before it pops? But if you fill it with cold air then move to a warm environment, it pops.
- Paraphrase of ElectricZen's explanation
- SoC is most easily calibrated using the battery pack's voltage at rest or near rest.
| Battery Voltage | SoC |
|---|---|
| 116.20 | 100 |
| 114.24 | 95 |
| 112.00 | 90 |
| 109.76 | 85 |
| 108.36 | 80 |
| 106.96 | 75 |
| 105.56 | 70 |
| 104.16 | 65 |
| 103.04 | 60 |
| 101.92 | 55 |
| 101.36 | 50 |
| 100.80 | 45 |
| 99.68 | 40 |
| 99.12 | 35 |
| 98.56 | 30 |
| 98.00 | 25 |
| 97.16 | 20 |
| 96.60 | 15 |
| 96.04 | 10 |
| 95.76 | 5 |
| 95.20 | 0 |
- SoC Indications per protomech
- The mobile app appears to simply show kWh using Zero's max capacity rating, i.e. present voltage times present amp hours.
- The voltage and amp-hours are likely to be correct, but the kWh readout is a rough guide at best.
- The percentage reading adjusts to the estimated pack maximum over time, so if the pack ages, the reported Ah and kWh readout will decrease, but not the maximum percentage.
- Variance across Battery Pack Years
- The sensors measuring current and temperature for the battery pack improve over the years, impacting SoC indication.
- One can find multiple complaints of going into limp-home mode at 5-15% from 2014 SR owners, for example.
- 2017 model year bikes appear to have an increased range of current sensor calibration quality, improving that year's estimations.
