The U.S. Department of Energy Lawrence Berkeley (Lawrence Berkeley) National Laboratory in October 2009, published in the United States set the cost of the report of photovoltaic solar cells, rechargeable laptop battery   research has pointed out: From 1998 to 2008, the average cost of these systems has decreased by over 30%. In 2008, the cost has dropped more than 4%.
A reported that the recent decline in costs, mainly photovoltaic modules cost reduction results.
From 2007 to 2008 set-up cost reduction marks the trend of the previous three years, during this period, with the United States and the rapidly expanding global PV market, the price of add-on costs pressurized module,   dell e1505 battery  the industry of solar energy expansion of manufacturing capacity and the global financial crisis was located in 2008, this dynamic evolution, driving down the price of the entire module.
In contrast, between 1998 and 2007, the decrease in costs is mainly due to non-module costs, as labor costs, management costs, the cost of the inverter and balance system.
Studies have shown that between 1998 and 2008 installed in 16 states, there are 52,000 grid-connected photovoltaic systems, the survey found, with an average cost of installation (in real 2008 dollars) from 1998 U.S. $ 10.80 / W to 2008 to U.S. $ 7.50 / W, the average fell 0.30 U.S. dollars / W.
As time passes, small-scale photovoltaic systems,  hp f4812a battery if applied to households with small-scale power systems for photovoltaic power generation, the largest cost reduction. In addition, in 2008, constructed a small residential photovoltaic installation costs have emerged as the size of the increase in cheaper, less the size of an average 2KW 9.20 U.S. $ / W while the 500 ~ 750KW system to large commercial scale to an average of U.S. $ 6.50 / W.
Different states, installation costs are not the same as in 2008 and the installation of the system were smaller than 10KW, sony vgp-bps2 battery  cost flat fee of Arizona as low as U.S. $ 7.30 / W, followed by California, the average installation cost is 8.20 U.S. dollars / W higher for the Pennsylvania and Ohio, for U.S. $ 9.90 / W.