The cost of the panels can depend on various factors. When we talk about home grid connection system, we look at the various products involved that comprises of the full system this includes: Solar PanelsIsolators Solar InvertersSmart Meters OptimisersBattery (if required) Racking or Mounting Kit  The cost of any home grid connection system will be based on: Total Solar System Size (e.g. 6.6kW)Product Brand and make (European, American or Asian) Quantity of PanelsProduct Quality (Tier 1) Panel Technology (Monocrystalline or Polycrystalline)Durability / Longevity (or warranty period)