ESK8 Calculator
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Build Configuration
Battery
Chemistry
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Li-Ion (18650/20700 and etc)
Li-Poly (RC battery packs)
LiFePO4
Li-Titanate
Nominal Cell Voltage
V/cell
Cells in Series
Cells in Parallel
Cell Capacity
mAh
Cell Const Discharge
A
Cell constant discharge rate without heating up
Cell Peak Discharge
A
Peak discharge rate for short period of time
Cell Max Charge Rate
C
Typically 18650 can charge max at 1C rating
Pack Size
S
Pack Capacity
mAh
Packs in Series
Packs in Parallel
Pack Const C Rate
C
Pack constant discharge rate without heating up
Pack Peak C Rate
C
Pack discharge rate for short period of time
Pack Max Charge Rate
C
Pack maximum charge rate depends on manufacturer safe value is 1C
Charger
Max Charging Current
A
Efficiency
%
Voltage Rating
230V/240V (UK/EU)
120V (US)
100V (JP)
Motor
Configuration
1wd
2wd
4wd
Speed/Volt
kV
Poles
Typically out-runner motor has 14 poles
Power Rating
W
Used for calculating motor current ratings
Avg. Power Consumption
Wh/km
Avg. Single motor power consumption per kilometer
Drive Train
Wheel Size
mm
Motor Pulley/Gear
Teeth
Wheel Pulley/Gear
Teeth
Efficiency
%
Overview
Avg Speed (Loaded)
km/h
Avg Speed (Loaded)
mi/h
Estimated Range
km
Estimated theoretical range based on avg power consumption
Estimated Range
mi
Estimated theoretical range based on avg power consumption
Total Max Torque
Nm
Maximum theoretical torque at maximum motor amps on all wheels after reduction
Total Max Torque
ft·lbs
Maximum theoretical torque at maximum motor amps on all wheels after reduction
Battery
Pack
Cells In Series
S
Cells In Parallel
P
Capacity
Ah
Energy (estimated)
Wh
Estimated energy using nominal cell voltage
Voltages
Pack Min Voltage
V
Pack Max Voltage
V
Pack Nominal Voltage
V
Currents
Pack Constant Discharge
A
Pack Peak Discharge
A
Pack Max Charging
A
Power
Pack Constant Power
W
Pack Peak Power
W
Charging
Charge Time
min
Full Charge Power Consumption
Wh
Power Outlet Required Current Rating
A
Range
Estimated Range
km
Estimated theoretical range based on avg power consumption
Estimated Range
mi
Estimated theoretical range based on avg power consumption
Motor
RPM
Lowest Max RPM (at empty charge)
RPM
Highest Max RPM (at full charge)
RPM
Avg Max RPM (at nominal charge)
RPM
Lowest Max RPM (Loaded)
RPM
Highest Max RPM (Loaded)
RPM
Avg Max RPM (Loaded)
RPM
ERPM
Lowest Max ERPM (at empty charge)
ERPM
Highest Max ERPM (at full charge)
ERPM
Avg Max ERPM (at nominal charge)
ERPM
Lowest ERPM (Loaded)
ERPM
Highest ERPM (Loaded)
ERPM
Avg ERPM (Loaded)
ERPM
Current
Max Current
A
maximum current motor is rated to draw at battery max voltage
Total Current (All Motors)
A
total maximum current motors are rated to draw at battery max voltage
Torque
Torque/Amp
Nm/A
Avg. torque per amp per motor
Max Torque
Nm
Maximum theoretical torque at maximum motor amps per motor
Total Max Torque
Nm
Maximum theoretical torque at maximum motor amps on all motors
Total Max Torque
ft·lbs
Maximum theoretical torque at maximum motor amps on all motors
Drive Train
Gear Ratio
Gear Ratio
Wheel RPM
RPM
Wheel RPM Loaded
RPM
Torque/Amp
Nm/A
Avg. torque per amp per wheel after reduction
Torque/Amp
ft·lbs/A
Avg. torque per amp per wheel after reduction
Max Torque
Nm
Maximum theoretical torque at maximum motor amps per wheel after reduction
Max Torque
ft·lbs
Maximum theoretical torque at maximum motor amps per wheel after reduction
Total Max Torque
Nm
Maximum theoretical torque at maximum motor amps on all wheels after reduction
Total Max Torque
ft·lbs
Maximum theoretical torque at maximum motor amps on all wheels after reduction
Speed
Min Speed
km/h
Max Speed
km/h
Avg Speed
km/h
Min Speed (Loaded)
km/h
Max Speed (Loaded)
km/h
Avg Speed (Loaded)
km/h
Speed
Min Speed
mi/h
Max Speed
mi/h
Avg Speed
mi/h
Min Speed (Loaded)
mi/h
Max Speed (Loaded)
mi/h
Avg Speed (Loaded)
mi/h