The most widely used energy storage system in the world is batteries, but large-scale grid solar batteries are usually very expensive. In 2011, solar batteries, wind energy and other renewable energy made great progress, and will continue into 2012. In fact, 2012 may be the year when renewable energy began to fight fiercely with traditional fossil fuels. The most widely used energy storage system in the world is batteries, but large-scale grid solar batteries are usually very expensive. According to Haresh Kamath, Energy Storage Research Project Manager of the Electric Power Research Institute (EPRI), a large amount of research work on small batteries for mobile phones and MP3 has been completed. 'Research applicable to these industries is now applied to grid batteries.' Large grid solar batteries have been discussed for several years, and it is a very popular idea. In fact, the grid battery market will be worth 30 billion US dollars per year, of course , May not be honored tomorrow. However, with the maturity of technology and rich experience, solar storage batteries will reach another height in the market in the next 10 years.