900 wp systems cost around 300 EUR including inverter and fixation but excluding labor and produces 150-200 EUR in electricity savings. Installation is 2-4 hou

900 wp systems cost around 300 EUR including inverter and fixation but excluding labor and produces 150-200 EUR in electricity savings. Installation is 2-4 hours when you do it yourself. My city Berlin is subsidizing 250 EUR of the purchase/installation cost but it wasn't worth the paper work hassle to me.