Battery

A cluster can have a battery. A battery stores energy from the power source and supplies it to the hosts later. Its policy decides when it charges and discharges, based on the carbon intensity of the power source.

Field	Type	Default	Description
name	string	"Battery"	Name of the battery.
capacity	number	required	The amount of energy the battery can store, in kWh.
chargingSpeed	number	required	The speed at which the battery charges, in Watt.
initialCharge	number	0	The charge at the start of the simulation, in kWh.
batteryPolicy	policy	required	When the battery charges and discharges.
embodiedCarbon	number	0	The carbon emitted to manufacture the battery, in gram.
expectedLifetime	number	0	The expected lifetime of the battery, in years.

Policies

The type selects the policy. In each policy, the battery charges until it is full when the carbon intensity is low, and discharges until it is empty when the carbon intensity is high.

Type	Fields	The carbon intensity is low when it is
single	carbonThreshold	below carbonThreshold.
double	lowerThreshold, upperThreshold	below lowerThreshold, and high when it is above upperThreshold. In between, the battery is idle.
runningMean	startingThreshold, windowSize	below the mean of the last windowSize carbon intensities.
runningMeanPlus	startingThreshold, windowSize	like runningMean, but the battery only starts charging once the carbon intensity stops decreasing.

Example

"battery": {
    "capacity": 100.0,
    "chargingSpeed": 5000.0,
    "batteryPolicy": { "type": "runningMeanPlus", "startingThreshold": 123.2, "windowSize": 168 }
}