EnergyCostHub calculator
Solar Savings Calculator
Estimate annual solar savings, feed-in income, payback period, and long-term value from a home solar system.
Estimate solar savings
Estimated annual solar benefit
$1,110.12
Based on your inputs, a 6.6 kW solar system could save approximately $1,110.12 per year, with an estimated payback period of 11.4 years.
- Annual benefit
- $1,110.12
- Payback period
- 11.4 years
- 25-year savings
- $15,153.00
- Annual generation
- 9,570 kWh
- Bill savings
- $894.80
- Feed-in income
- $215.33
Assumptions
- Self-consumption
- 55%
- Analysis years
- 25
Assumptions used
- Electricity rate
- $0.17/kWh
- Gas rate
- $1.2 per unit
- Daily supply charge
- $0.45/day
- Average monthly usage
- 850 kWh
- Annual sun hours
- 1450
- Source note
- Illustrative default; verify your current local tariff.
How this estimate works
The calculator combines your usage assumptions with local default rates. You can replace every default value with a current rate from your provider, installer, or local authority.
What can change the result
Weather, tariff structure, fixed charges, equipment efficiency, household behavior, incentives, and policy updates can materially change the estimate.
Check before you act on an estimate
This solar savings calculator is a planning tool for your household. Begin with the default values only to understand the calculation, then replace them with current figures from your utility bill, installer proposal, vehicle information, or official program documentation.
For solar, compare the installation proposal with your daytime consumption, retail electricity rate, export credit, and confirmed incentives. Ask for a production estimate that identifies the roof layout and shading assumptions. Financing, maintenance, future price changes, and panel degradation may affect the outcome beyond the simple payback shown here.
Run a conservative scenario as well as a likely scenario. Rates, weather, household behavior, equipment performance, export terms, and policy eligibility can change over time. A useful estimate makes those assumptions visible instead of presenting one number as a promise.
Before acting on the result, check the billing period, units, fixed charges, and any terms that the calculation cannot confirm. Treat a large difference from a bill, quote, or offer as a reason to review those source documents, not as proof that one source is wrong.
Keep the figures you entered with the result so it can be reproduced later. That record makes it easier to compare a new tariff, equipment proposal, or charging pattern on the same basis, and it helps identify whether a changed result came from a real household change or a different assumption.
FAQ
How accurate are these estimates?
They are educational estimates based on your inputs and default assumptions. Actual bills and savings vary by provider, tariff, season, equipment, and local policy.
Do you store my personal data?
No login is required, and the calculator does not ask for your name, address, utility bill images, or other sensitive household information.
Can I use this for official financial decisions?
No. Use these results as a planning aid only, then verify current rates, incentives, and costs with your utility, installer, or local authority.