Solar Panel Calculator for Missouri (MO)

Calculate how many solar panels you need in Missouri, estimated costs after the 30% federal tax credit, payback period, and 25-year savings. Based on 4.5 peak sun hours/day and $0.131/kWh average electricity rate.

Peak Sun Hours
4.5 hrs/day
Avg Rate
$0.131/kWh
Net Metering
Yes
Solar Rank
#23/51

☀️ Missouri Solar Panel Calculator

8,015 kWh
400W
100%

Your Missouri Solar System

Panels Needed
186
System Size
74.40 kW
Annual Production
97,762 kWh
Gross Cost
$208,320
Federal ITC (30%)
-$62,496
Net Cost
$145,824
Annual Savings
$12,807/yr
Payback Period
11.4 years
25-Year Savings
$174,345
CO₂ Offset
127.1 tons/yr
Trees Equivalent
2,118/yr

⚠️ 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 kWhPanelsSystem kWNet CostSavings/yrPayback
500 kWh124.8$9,408$82611.4 yrs
750 kWh187.2$14,112$1,23911.4 yrs
1,000 kWh249.6$18,816$1,65211.4 yrs
1,250 kWh2911.6$22,736$1,99711.4 yrs
1,500 kWh3514.0$27,440$2,41011.4 yrs
2,000 kWh4718.8$36,848$3,23611.4 yrs
2,500 kWh5823.2$45,472$3,99411.4 yrs

Based on 4.5 peak sun hours/day, $0.131/kWh, $2.8/W install cost, 80% derate. 30% federal ITC applied.

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 gross, or $15,680 after the 30% federal ITC. 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

Top 10 Solar States Comparison

RankStateSun HoursRateCost/Watt
#1California5.8$0.267$2.82
#2Hawaii5.2$0.387$3.35
#2Texas5.3$0.134$2.6
#3Arizona6.5$0.134$2.55
#4Florida5.5$0.145$2.6
#5Nevada6.2$0.127$2.55
#6Massachusetts3.8$0.268$3.2
#7New Jersey4.2$0.175$2.9
#8New Mexico6.2$0.137$2.75
#9Colorado5.5$0.148$2.9

See also: Electricity Cost in Missouri