What is the efficiency of wireless charging coils?

The efficiency of wireless charging coils, also known as the coil's Q-factor or power transfer efficiency, can vary depending on several factors including the design of the coils, the distance between the transmitter and receiver coils, the alignment of the coils, the frequency of the alternating current, and the materials used in their construction.
Typically, wireless charging systems, such as those based on Qi standards, have an efficiency range of about 70% to 80%. This means that for every 100 watts of electrical power supplied to the transmitter coil, between 70 and 80 watts are received by the receiver coil, with the remainder being lost as heat due to resistance in the coils and other inefficiencies in the system.
In some advanced systems or those designed for optimal performance, efficiencies can reach up to 90% or slightly higher. However, it's important to note that as the distance between the transmitter and receiver coils increases, the efficiency of the system decreases. Similarly, misalignment of the coils can also lead to reduced efficiency.
For specific wireless charging coils like the SY-TX001S, the manufacturer would provide detailed specifications regarding its efficiency. It's always best to refer to the technical datasheet for the most accurate and detailed information.