Assertion: turbine's system | /r/Desires | battery
Facets:
value: to store excess power
type: PURPOSE
value: to store electricity
type: PURPOSE
Source sentences:
text: For instance, off-grid systems require a battery to store electricity, and a charge controller to protect the battery from overcharging.
text: Stand-alone systems (systems not connected to the utility grid) require batteries to store excess power generated for use when the wind is calm.