Size of solar panels
For the purposes of this guide, we are assuming that the solar energy generated by the panels will be stored in a battery or number of batteries. The basic principle is to identify the size of panel maintain sufficient charge of energy in your battery to support your typical usage requirement.
This tool is developed by mr. Jignesh Parmar, and available for FREE download:
Download: Right Here

We are working on energy saving.
can any one pls suggest how to down load excel files here. thanks