Find your house, tap the windows or railings where panels would hang, and enter what the kit costs. Estimates use St. Louis sunlight by month and Ameren's seasonal residential rates.
Enter your address to load your home's real outline, or pick the closest house style.
Each tap on a window or railing places one kit there. Tap again to remove it. Sunny walls face south, southwest or southeast.
Building outlines © OpenStreetMap contributors.
Not yet protected by state law. Missouri House Bills 2528 and 2444 would exempt plug-in solar devices from Public Service Commission rules. Both were introduced in the 2026 session and deferred to 2027. Until a law passes, a utility can require interconnection review, permits or fees.
It depends on which way the panel faces, its tilt, shade and how much power your home uses during the day. A single 800-watt kit hung vertically on a south-facing wall typically saves around $80 to $120 a year on Ameren Missouri rates. The estimator above calculates it for your house.
Most state plug-in solar laws cap a system at 800 watts or 1,200 watts per circuit. A standard 15-amp, 120-volt circuit carries 1,800 watts, or 1,440 watts under the 80% continuous-load rule. Missouri's cap has not been set. Plug directly into a wall outlet, never an extension cord or power strip, and use one kit per circuit.
Not without a net-metering agreement. Power your home does not use while the sun is out flows back to the grid without credit, so savings come from the electricity your home uses at the same time the panel produces it.
Plug-in kits hang on a balcony railing, window or wall, or sit on a ground stand, and plug into a standard outlet, so they suit renters and apartments. Check your lease and get landlord approval before mounting anything on the building.
Estimates only. Sunlight: St. Louis monthly average solar radiation, modeled hour by hour for each panel's direction and tilt. Rates: Ameren Missouri Residential Anytime, effective June 1, 2025 (summer June–September 15.60¢/kWh; winter 10.62¢ for the first 750 kWh, 7.14¢ above), before riders and taxes. Plug-in limits: most state plug-in solar laws cap a system at 800 W or 1,200 W; Missouri's cap is not set. A 15 A, 120 V circuit carries 1,800 W, or 1,440 W at the 80% continuous-load rule. Use UL-listed kits (UL 3700 for plug-in systems). Have a licensed electrician confirm your circuit.