We are explaining here how to calculate and decide about the solar power plant installation. Which size solar panel you use depends mainly on how much roof space you have available and how much electricity you plan to use (with solar power). Below are 6 steps to calculate which size solar panels you need for your building.
Step 1: Know Your Electricity Usage
Gather your old electricity bills for the past 12 months. Contact your utility company if you don’t have them and your electricity provider should gladly send you a printout with your past electricity usage. You’re looking for one thing and this is your monthly unit (kWh) usage.