About
About Solar Panel Cost Calculator
Solar Panel Cost Calculator is an educational planning tool for estimating solar panel output, system cost, electricity bill savings, payback period, panel count and long-term ROI.
The site is designed for early research before requesting installer quotes. It lets users change the main assumptions themselves, including system size, electricity price, export tariff, installed cost, panel wattage, self-consumption and solar performance ratio.
What this site helps estimate
- Approximate daily, monthly and annual solar electricity production.
- How many panels may be needed for a target system size.
- Estimated annual bill savings from self-used solar electricity.
- Estimated export earnings where surplus solar can be sold back to the grid.
- Simple payback period and long-term solar ROI.
- How battery storage can affect self-consumption assumptions.
How to use the results
The results should be treated as a planning estimate, not a quote, guarantee or engineering design. Solar outcomes vary by roof direction, roof pitch, shading, local weather, inverter efficiency, grid rules, retail electricity prices, export tariffs, installer pricing and available incentives.
For a realistic decision, compare the calculator output with at least one current local installer quote, your actual electricity tariff, your household usage pattern and any applicable rebates or permitting requirements.
Key assumptions to check
- Your average electricity price per kWh.
- Your local feed-in, export or net-metering arrangement.
- Average peak sun hours for your region.
- Roof orientation, pitch and shading.
- Installed cost after incentives, grants or tax credits.
- Whether a battery is included in the project cost.