Asking yourself, “how big should my solar panels be?” In order to find a solar panel calculator or solar energy calculator, stick around the AltE website for all of your needs. Want to know “how do I size my home battery”? You’ve come to the right place to find out. Make sure to have your monthly electricity bill handy while using this solar calculator. This solar panel calculator will help you with your system size for your renewable energy solar panel system. Your monthly electric consumption plays a big part in determining your solar array size calculation. So, if you want to figure out the number of solar panels and what size battery you need check out the links below.