Yes, a solar controller can be used in a hybrid solar panel system. A solar controller, also known as a charge controller, is responsible for regulating the voltage and current from the solar panels to the batteries or grid. In a hybrid solar panel system, which combines both solar and other energy sources like wind or grid electricity, a solar controller is still necessary to manage the charge from the solar panels. It helps ensure that the batteries are properly charged and protected from overcharging or excessive discharging. Additionally, a solar controller can also monitor and optimize the energy flow between the different energy sources in a hybrid system, maximizing the efficiency and utilization of the solar power generated.