A smart solar energy-harvesting system is suggested to provide consistent and long-term electricity. Solar panels, lithium batteries, and control circuitry make up the system. The system's dependability and stability are enhanced by using hardware rather than software for charge management of the lithium battery. When the sun is shining, it will draw electricity from the solar panels; in cloudy, rainy, or nighttime situations, it will rely on the lithium battery as an additional power source. Using a maximum power point tracking (MPPT) circuit, the system optimizes solar energy use and extends the life of the lithium battery via smart charging that reduces the frequency of the battery's charge-discharge cycle. Internet of Things (IoT) wireless sensor nodes located outdoors are ideal candidates for this system because of its reduced power requirements.