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Aug 22, 2017
By Editors of Power Engineering
The study, which examined solar systems in Southern California, indicated the cost of the batteries along with 2014 solar electricity prices caused the cost-benefit ratio to fall well short of standalone solar arrays.
Though AC-coupled and DC-coupled systems increased the cost-benefit ratio slightly, even 30 percent investment tax credits only pushed the ratio to just below 1.4. Photovoltaic solar alone had a cost-benefit ratio of slightly above 1.4.
As the energy storage market continues to mature, battery costs should fall. However, the study indicated energy storage would provide a much better cost to benefit ratio in areas with higher photovoltaic penetrations than solar alone by 2020. Solar plus storage would show a cost-benefit ratio mostly similar to solar alone, not including investment tax credits.