In a solar vehicle , there exists an accumulator pack to store the energy generated by the solar array and release it in a more reliable manner. Since the solar cells’ output power is dependent on the sun and weather (which vary greatly upon several factors), the accumulator pack can provide a more reliable source when solar energy cannot be depended on. When weather becomes unpredictable and the amount of solar exposure decreases, the accumulators help supplement the car’s lack of power. Batteries are a common choice in accumulator packs, but require a battery monitoring system to prevent hazards from occurring. Together, the batteries and the battery monitoring system comprise a central and important part of solar vehicles.