Optimal company specializes in solar cell 156x156mm , 125x125mm , solar panel from 3w to 300w . we have been in this line for more than 10 years , our products have been exported to more than 40 countries . replying on reasonale price and better quality , we have expanded our business , now we can provide you the whole system wind turbine ,solar panel , controller, inverter, battery . if you like,also welcome to our factorr and check the quality of our products .if you are interested in our products ,please tell me ,i hope i have the chance to help you expnd your market .contact person :Cathy phone:86-13538271080website :www.optimalmy.com