... ,we send free parts to maintance the system. FACTORY INTRODUCE:Foshan tanfon energy technology co ... a professional manufacturer of solar system products,wind turbine system products,home system products,pure sine wave ... :1)We provide whole system,for on grid system and off grid system;2)It is easy ... enginer will guide to install the system;3)Warranty:Solar panel for 3years,controller/off grid inverter ...