Hi Andre, I have been trying to model a Stand alone system with batteries and Sunpower modules. I am using batteries that I have defined myself. Once I start the system configuration and choose the batteries, everything goes fine till I begin to choose the modules. Access error messages show up like the one shown in the screen shot. Please help me understand how I can get round this problem. I am trying to model my stand alone system's performance. Abhinav Gupta Screen Shot of the error 2013_09_23-10_42_26-PVsyst611-logs.zip Log Files
