The current limiter ensures that the fan current does not exceed the rated value. The current flows through LED then to the FAN+ terminal. The current limiter output is connected to the LED. It consists of a solar PV panel, which is connected to a current limiter. Note that the power draw from battery is dynamically changing based on the instantaneous PV power.įigure 1 shows the block diagram of proposed solar fan. This objective has been achieved without using complex switching circuits. Another benefit of this approach is the PV panel operates near maximum power point, thus maximizing the PV power generated. Also, charge/discharge losses in the battery are reduced. If it is a sunny day, almost zero power may be drawn from the battery. During the daytime, we are drawing only fraction of power from the battery. Then inject just enough power from the battery for the fan to run at near-constant speed. The concept behind this approach is to utilize all the power generated by the PV panel to run the fan. In addition to this, there are losses in the battery during charging and discharging.Ī new design is proposed here which runs the fan at constant speed. Since all the power is routed through the battery the battery experiences a large number of charge/discharge cycles. The user can run the fan for a few hours until the battery drains. Even though this works fine, there are limitations. The user can run the fan on battery power whenever desired. These systems use a solar panel and a battery. There are other designs available in the market.
When the sunlight intensity varies, the fan speed fluctuates very widely.The system does not operate at maximum power point, resulting in a poor utilization of the PV panel.This simple arrangement does work, but has few serious drawbacks: The easiest way of making a solar fan is to connect the solar PV panel to a DC fan of a matching voltage and power rating.
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