What Is the Difference Between kW and kWh?

kW (kilowatt) expresses power, that is, the speed of charging; kWh (kilowatt-hour) expresses the amount of energy, i.e. the total energy transferred to the vehicle or stored in the battery. In a simple analogy, kW is the flow rate of a tap (how fast the water flows) and kWh is the amount of water that fills up (how much water goes into the bucket in total). The two are linked by time: the energy transferred (kWh) is roughly equal to the power (kW) multiplied by the charging time (hours). For example, charging at 11 kW for 1 hour transfers about 11 kWh of energy; loading 22 kWh at that same 11 kW takes roughly 2 hours. So the vehicle's range is determined by kWh (battery capacity), while how fast it charges is determined by kW. Bemis AC devices operate in the 3.7–22 kW range, and the BEVDC series DC units in the 40–200 kW range. In practice this difference directly affects device choice: for a car parked overnight for 8 hours at home, a low-kW AC device fits enough energy, whereas loading the same kWh quickly at the roadside requires a high-kW DC unit. In other words, your need is defined not by 'how much energy' but by 'in how much time'.