Solar Panel Calculator for Missouri (MO)
Calculate how many solar panels you need in Missouri, installed cost, payback period, and 25-year savings — updated for 2026 (the 30% federal tax credit expired December 31, 2025). Based on 4.5 peak sun hours/day and $0.131/kWh average electricity rate.
☀️ Missouri Solar Panel Calculator
Your Missouri Solar System
⚠️ Estimates only. Actual costs and production vary. Consult a licensed solar installer. NEC Article 690 compliance required.
Solar System Sizes by Usage in Missouri
| Monthly kWh | Panels | System kW | Net Cost | Savings/yr | Payback |
|---|---|---|---|---|---|
| 500 kWh | 12 | 4.8 | $13,440 | $826 | 16.3 yrs |
| 750 kWh | 18 | 7.2 | $20,160 | $1,239 | 16.3 yrs |
| 1,000 kWh | 24 | 9.6 | $26,880 | $1,652 | 16.3 yrs |
| 1,250 kWh | 29 | 11.6 | $32,480 | $1,997 | 16.3 yrs |
| 1,500 kWh | 35 | 14.0 | $39,200 | $2,410 | 16.3 yrs |
| 2,000 kWh | 47 | 18.8 | $52,640 | $3,236 | 16.3 yrs |
| 2,500 kWh | 58 | 23.2 | $64,960 | $3,994 | 16.3 yrs |
Based on 4.5 peak sun hours/day, $0.131/kWh, $2.8/W install cost, 80% derate. No federal credit applied (25D expired Dec 31, 2025).
Complete Guide to Solar Panels in Missouri (2026)
Missouri receives an average of 4.5 peak sun hours per day, providing solid conditions for residential solar. With average residential electricity rates of $0.131/kWh, solar offers long-term savings potential.
Solar Installation Costs in Missouri
The average cost to install solar panels in Missouri is $2.80 per watt before incentives. For a typical 8 kW system, that translates to approximately $22,400 installed. The 30% federal ITC expired for systems installed after December 31, 2025, so state and utility programs are now the main cost reducers. Available incentives: Federal ITC (30%), Ameren Missouri rebates.
Net Metering in Missouri
Missouri net metering status: Yes. Ameren Missouri offers solar rebates that can significantly reduce installation costs.
NEC Requirements for Solar in Missouri
All solar installations must comply with NEC Article 690, Solar PV Systems. Key requirements:
NEC 690.8, Circuit Sizing: PV conductors must carry at least 125% of maximum circuit current. For a 10A string, conductors must be rated for 12.5A minimum.
NEC 690.12, Rapid Shutdown: Module-level shutdown must reduce voltage to 80V or less within 30 seconds. Critical for firefighter safety.
NEC 690.31, Wiring Methods: USE-2 or PV Wire within the array; approved wiring methods (EMT, rigid conduit, MC cable) for building penetrations.
NEC 310.15, Ampacity Derating: Conductors in conduit must be derated per Table 310.15(B)(3)(a). Account for seasonal temperature variations when sizing conductors. Use our Wire Size Calculator and Derating Calculator for proper sizing.
Solar Wire Sizing for Missouri
Panel strings to combiner box: Typically 10 AWG USE-2 or PV Wire for runs up to 100 feet. Use our Solar Wire Size Calculator to verify.
DC main run to inverter: Usually 6 AWG or 4 AWG THWN-2 in conduit. Keep DC voltage drop under 1.5% with our Voltage Drop Calculator.
AC from inverter to panel: A 7.6kW inverter on 240V draws ~32A, requiring a 40A breaker and 8 AWG copper minimum. Verify with our Breaker Size Calculator.
Environmental Impact
A 74.40 kW system in Missouri offsets approximately 127.1 metric tons of CO₂ per year, equivalent to planting 2,118 trees annually. Missouri grid carbon intensity: 1.3 lbs CO₂/kWh.
Disclaimer: Estimates only. Actual costs and production vary by roof orientation, shading, installer, and equipment. Consult a licensed solar installer in Missouri. NEC Article 690 compliance required for all installations.
Frequently Asked Questions
See what solar could actually cost and save at your address.
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Get Free Solar Quotes →Top 10 Solar States Comparison
| Rank | State | Sun Hours | Rate | Cost/Watt |
|---|---|---|---|---|
| #1 | California | 5.8 | $0.267 | $2.82 |
| #2 | Hawaii | 5.2 | $0.387 | $3.35 |
| #2 | Texas | 5.3 | $0.134 | $2.6 |
| #3 | Arizona | 6.5 | $0.134 | $2.55 |
| #4 | Florida | 5.5 | $0.145 | $2.6 |
| #5 | Nevada | 6.2 | $0.127 | $2.55 |
| #6 | Massachusetts | 3.8 | $0.268 | $3.2 |
| #7 | New Jersey | 4.2 | $0.175 | $2.9 |
| #8 | New Mexico | 6.2 | $0.137 | $2.75 |
| #9 | Colorado | 5.5 | $0.148 | $2.9 |
Related Calculators
Solar Calculator by State
See also: Electricity Cost in Missouri