Each year, more than 3 million people die from diseases that can be prevented by widely available vaccines. These vaccines are not always accessible because they must be stored within a specific temperature range. The goal of our project is to create a solar powered refrigerator that can be used for vaccine storage in developing nations - particularly in areas with limited access to the power grid. As per guidelines set by the World Health Organization, the fridge must maintain an ambient temperature of between 35.6 - 46.5°F (2-8 °C). Also, it should be able to maintain said temperature without access to solar or grid power for several days. To achieve this goal, we utilized a thermoelectric cooling element, ultra-effective insulation techniques and a compartmentalized heat exchange system. A wireless-enabled embedded system will monitor and control the refrigerator's temperature, duty cycle and temperature deviation alerts. The entire system can be powered via a solar panel, the battery backup or grid power (when it is available).

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