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What is the return on investment?

The actual return on investment will depend on a number of factors:

  • The average daily energy production at your location: this determines the kWh produced per kW of solar capacity, taking into account the number of daylight hours, the intensity of the sunlight, the relative proportions of full sun versus cloudy days, the orientation and tilt of your installation.
  • The actual dirt loading at your location.
  • The cost of electricity (to replace the energy not produced by your panels due to dirt).

Some of these factors are known for some locations, and some can be estimated. Using these assumptions, the payback period and value of lost solar output for 13 "dry" locations in Australia is shown below.

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