With Easy-PV you can easily create a PV project online for free. You can create an instant schematic and use the performance calculator to estimate PV system output. Easy-PV was designed and built by the folks at Midsummer Solar Wholesale. You have the choice of a free acccount which can save up to 20 projects, or a 'Pro' account for a small monthly subscription which can store unlimited projects.  EASY PV CO UK