This is Owen(Sales Manager) from Challentec( Wuxi) Co., Ltd in China , I�m so glad to contact with you . We professionally produce small grid tie wind inverter and wind controller which can match different specification of small wind turbine from 1kW to 10KW. and could make turbine running in ideal condition and let it make energy in Maximum efficiency. Our company import Germany tech and Manufacture located in Wuxi of China. ADVANTAGE: Challentec Inverters 1. German VDE Certificate�There is nearly no company�s wind on-grid inverter can approve by this German�s authentication system in China, but we can! � 2. Voltage input range much wider than SMA . 3. 20 plot points on power curve. 4. Over volt, over current and over temperature protection. 5. Inbuilt isolation transformer. 6. Choice of IP20 or IP65 enclosure. 7. Optional remote monitoring. 8. Manufactured in our own modern factory in Wuxi, China for competitive price with high quality.