I'm a Solar PV Design Engineer having more than 5 years of work experience purely on solar PV field. I can do the single line diagram of your solar PV project using AutoCAD. ( take a look at my previous work shown in this Gig ) To do an accurate design, please provide me followings: 1. The capacity, no. of panels and inverters and other relevant information about project 2. Datasheet of the solar panel 3. Datasheet of the Inverter 4. Datasheet or details of the DC Com. box if applicable 5. String sizing for each inverter 6. Solar panel orientation or the panel layout if available After you give me all information as in above, I can offer you followings: 1. AutoCAD file of complete Single Line Diagram 2. A PDF file of the same