Kilowatt-hour (kWh)

Electric utility companies use Kilowatt-hours (kWh) to measure electricity use as one thousand watts (1 kilowatt) of equipment running continuously for sixty minutes. Customers receive utility bills based on how many kWh they use each billing cycle. The size of a solar PV system requires knowledge of the kilowatt-hour (kWh) metric because most installations aim to produce enough power to meet substantial energy demand throughout a year.