This depends on:

  1. How much electricity is used each day
  2. When you use most of your electricity (day or night)
  3. Your budget

     
    Your usage System size Mid-range system
    (after rebate)
    Premium system (after rebate)
    Small user
    ($250-$350/qtr)
    2kW system $3,900 $4,900
    Medium user
    ($350-$600/qtr)
    3kW system $5,000 $6,400
    Larger user
    ($600-$750/qtr)
    5kW system $7,100 $8,500
    Big user
    ($750+/qtr)
    7kW system $8,800 $11,400