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theodora-davidson
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Why are prices declining?
Generally, solar panels make up about 50% of the cost of a system (40% for thin film), the inverter is 10%, and the balance of system is 40%.
Decline in price is being driven by: Increased solar cell efficiency manufacturing technology
improvements Economies of scale Intense competition (particularly from
China)
Monthly Savings Calculation: A south facing roof top solar system with no shading, and with a normal yearly dessert sunlight radiance of 2,400 per square meter would produce 1,840 kWh of electricity per year per nameplate kW capacity (assuming 23.3% losses for DC to AC conversion and other system losses).
With a 5 kW system installed, the first year production would be 9,200 kWh (5 x 1,840). Assuming a system degradation of 0.5% per year times 25 years yields a net 8,050 kWh yearly average electricity savings (9,200 x .875).
Assuming an average 2010 residential electricity price in AZ of $0.11 per kWh yields a yearly savings of $886 (8,050 x $0.11 not counting future inflation). The monthly savings would then be $73.79 ($886 divided by 12). This was then rounded to $74.00 even.