Can I afford photovoltaics?
That depends on your application. Generally, the cost of PV energy is higher than energy bought from your local utility. However, if you need power in a location not served by a utility, PV may be the cost-effective option. The number of PV system installations is increasing rapidly. As more people learn about this versatile and often cost-effective power option, this trend will accelerate. You should consider your goals and distinguish between your wants and your needs. Reevaluate your ideas about having electric power available during all kinds of weather – 100 percent availability. Availability has a unique meaning for a PV system because it depends not only on reliable equipment but on the level and consistency of sunshine, and the capability of the energy storage system. Because the weather is unpredictable, designing a PV system to be available for all times and conditions is expensive, and often unnecessary. PV systems with long-term availabilities greater than 95 percent are ro
