Solar Panel Cost Calculator for Missouri
Estimate a solar system's cost in Missouri, with the state's average price per watt, electricity price and solar output loaded.
Your result
Enter your numbers and press the button. Your result appears here.
Solar in Missouri averages $2.49 per watt on EnergySage, below the U.S. average of $2.60. An 8 kW system comes to about $19,920 before incentives.
How it works
Size (kW) = monthly kWh × 12 × share covered ÷ yearly kWh per kW. Cost = size in watts × price per watt + batteries − rebates.
Example: 8.0 kW (20 × 400 W) at $2.49 per watt costs about $19,920 and makes about 11,464 kWh a year.
Missouri solar figures
| Average installed price | $2.49 per watt |
|---|---|
| Residential electricity price | 14.28¢ per kWh (U.S. 18.19¢) |
| Yearly output of 1 kW of panels | 1,433 kWh (U.S. 1,367) |
| Peak sun hours | 5.03 a day |
| 8 kW system | $19,920 before incentives |
| First-year savings, 8 kW | $1,637 |
| Payback, 8 kW | 12.5 years |
| 25-year net gain, 8 kW | $18,642 |
At a glance
Same settings as the calculator, changing only the system size.
| System size | Size | Cost | kWh a year | Payback |
|---|---|---|---|---|
| 4 kW | 4.0 kW | $9,960 | 5,732 | 12.2 yrs |
| 6 kW | 6.0 kW | $14,940 | 8,598 | 12.2 yrs |
| 8 kW | 8.0 kW | $19,920 | 11,464 | 12.2 yrs |
| 10 kW | 10.0 kW | $24,900 | 14,330 | 12.2 yrs |
| 12 kW | 12.0 kW | $29,880 | 17,196 | 12.2 yrs |
| 15 kW | 15.2 kW | $37,848 | 21,782 | 12.2 yrs |
Common questions
How much do solar panels cost in 2026?
EnergySage marketplace quotes average $2.60 per watt nationally, or about $20,800 for an 8 kW system, before incentives. State averages run from $2.12 in Florida to $3.72 in Alabama.
What size solar system do I need?
Divide your yearly use in kWh by the yearly output of 1 kW of panels where you live. The average U.S. home used 865 kWh a month in 2024, which takes about 7.6 kW at the national average output.
Is there still a federal solar tax credit?
Not for homeowners who buy their system. The 30% Residential Clean Energy Credit ended for systems installed after December 31, 2025. Leased systems and PPAs can still carry a business credit (48E) that the installer claims.
Why do solar quotes vary so much?
Equipment is only about a third of the price. Sales, marketing, overhead and profit make up about 40% in EnergySage's breakdown, so installers' prices differ widely.
Sources
- EnergySage, Solar panel cost by state (updated November 6, 2026): https://www.energysage.com/local-data/solar-panel-cost/
- U.S. EIA, Electric Power Monthly, Table 5.6.B (residential price, Jan–Aug 2026): https://www.eia.gov/electricity/monthly/epm_table_grapher.php?t=epmt_5_6_b
- NREL PVWatts v8 (20° tilt, south-facing, 14% losses), state results compiled by TheGreenWatt: https://thegreenwatt.com/average-peak-sun-hours-by-state/
- EnergySage, Solar battery backup cost (H1 2026): https://www.energysage.com/energy-storage/solar-battery-backup/