Answer to Question 1
Standard automobile batteries have thin plates and are designed for high starting currents. Deep cycle batteries have thick plates and are capable of deeper discharge cycles, so they should be specified for solar electric systems.
Answer to Question 2
Life-cycle costs include all expenses over the expected life of a system. By using life-cycle costs, the system can be compared with alternatives including conventional systems. The initial cost of solar energy systems is usually higher, but may have lower operating costs and have almost no energy cost.
Deserts differ across the world. (a) Acacia trees between a gravel plain and sand dunes in the Namib
The Sunspot Cycle
Serotonin and the Sleep–Waking Cycle
Generalized biogeochemical cycle
Recently discovered members of the deep pelagic community
Major cell cycle checkpoints