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Cost per Watt Formula:
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Cost per watt is a standard metric used in the solar industry to compare the installed costs of solar photovoltaic (PV) systems. It represents how much you pay for each watt of solar capacity installed.
The calculator uses a simple formula:
Where:
Explanation: This calculation gives you the price you're paying per unit of solar capacity, allowing for easy comparison between different system sizes and quotes.
Details: Calculating cost per watt helps you determine if you're getting good value for money when comparing solar quotes. Lower cost per watt generally indicates better value, though quality components and installation should also be considered.
Tips: Enter the total installed cost of your solar system (including all components and installation) in AUD, and the system size in watts. For reference, 1 kilowatt (kW) = 1000 watts (W).
Q1: What is a good cost per watt in Australia?
A: As of 2023, typical residential solar systems in Australia range from A$0.80 to A$1.50 per watt, with premium systems up to A$2.00 per watt.
Q2: Does cost per watt include rebates?
A: This calculator uses the net cost after any rebates or incentives. Be sure to use your out-of-pocket cost after all discounts.
Q3: Why look at cost per watt instead of total cost?
A: Cost per watt allows comparison between different system sizes. A larger system will have a higher total cost but may have a lower cost per watt due to economies of scale.
Q4: Should I always choose the lowest cost per watt?
A: Not necessarily. Consider quality of components, warranty, and installer reputation. Sometimes paying slightly more per watt for better quality pays off long-term.
Q5: How does cost per watt vary by system size?
A: Generally, larger systems have lower cost per watt due to fixed costs being spread over more capacity. Small systems (<3kW) often have higher cost per watt.