Direct answer
kW vs kWh: What Is the Difference?
kW is power and kWh is energy. They are related by time but are not directly interchangeable units.
Question
What is the difference between kW and kWh?
kW measures power; kWh measures energy. 1 kWh is the energy used by 1 kW running for 1 hour.
kW
Power
kWh
Energy
Relationship
kWh = kW x hours
Explanation
Kilowatt (kW) is a rate: how fast energy is being used or produced.
Kilowatt-hour (kWh) is an amount of energy: power multiplied by time.
Use kW for equipment capacity and kWh for electricity consumption or billing.
Important caveat
Do not convert kW to kWh without a time value. A 2 kW heater running for 3 hours uses 6 kWh.