Tell us what system size you believe is best for your property. We will calculate how much you can save annually and over a 25-year period. Package Includes Package Includes gives you a percentage of the solar energy generated that you consume This results in a much more accurate solar calculation. Always double-check that the generation figures quoted are accurate for your region. Choose an average price per kwh for your electricity. Your electricity provider and distributor may have different policies. Create an average price to determine how much money you can save by going solar.