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| Energy harvesting systems are also an alternative energy source for IoT devices. They capture energy from the environment and convert it to electrical energy to supply IoT devices. Suppose the energy captured is more than the power demand of the IoT device. In that case, the surplus can be stored in energy storage systems when the energy harvesting system cannot produce enough energy to supply the IoT device. A significant drawback of energy harvesting is that the amount of energy that can be harvested at any given time depends mainly on environmental conditions or the presence of external energy sources, resulting in a fluctuation in the amount of energy harvested over time. Hence, it is vital to carefully size the energy harvesting unit and the energy storage system in such a way as to maximise the lifetime of the IoT device. Sample architecture of a self-powered Green IoT device powered by a battery energy storage system and an energy harvesting system is present in figure {{ref> | Energy harvesting systems are also an alternative energy source for IoT devices. They capture energy from the environment and convert it to electrical energy to supply IoT devices. Suppose the energy captured is more than the power demand of the IoT device. In that case, the surplus can be stored in energy storage systems when the energy harvesting system cannot produce enough energy to supply the IoT device. A significant drawback of energy harvesting is that the amount of energy that can be harvested at any given time depends mainly on environmental conditions or the presence of external energy sources, resulting in a fluctuation in the amount of energy harvested over time. Hence, it is vital to carefully size the energy harvesting unit and the energy storage system in such a way as to maximise the lifetime of the IoT device. Sample architecture of a self-powered Green IoT device powered by a battery energy storage system and an energy harvesting system is present in figure {{ref> | ||
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