Extended Battery Life in Smart Watch using Photovoltaic with Quantum Dot and Conversion System Low output power from harvesting sources, in ambient conditions constraints its application as a sustainable power source to mobile electronics in extending battery life. In this work, a novel ultralow power, energy conversion system that harvests and adds energies from a novel solar harvester to enhance battery life of a smart watch in ambient operating conditions has been proposed. Eventually, an ultralow power circuit has been designed that can capture the power inputs from a photovoltaic sources using Quantum Dot (QD) in room configuration, add them optimally and finally charge the battery. As a proof of concept the solar panels are added to the straps of the smart watch to retain the flexibility of the straps and the conversion circuit board added to the back panel of the watch. Experimental results reported shows that in practical operating light conditions there is about 1.5 times increase in operating time of a smart watch full load conditions.

Monitoring the OffGrid Photovoltaic Charging of Motorized Shades through IoT Networks Motorized window shades are widely used with embedded lithiumion batteries that are charged by solar energy via photovoltaic (PV) arrays. The complex models of sun irradiance and glass light absorption are developed to forecast the energy balance for long term operation of those offgrid shades. However, the batteries are often depleted due to partial shading and low illumination. The paper presents a new method of monitoring the energy balance of those motorized shades via IoT networks. The battery voltage variations over time are periodically measured to calculate the input solar energy and the motor power consumption. The result can inform users to either add more PV arrays or charge battery using a power adaptor before it is completely discharged. It guarantees the continuous operation of motorized shades.