System capacity
A larger potential system can produce more electricity, all else equal.
Property-specific production estimate
Solar Panel Output Calculator
See how much electricity your roof could produce.
Enter your address to estimate your roof's potential solar electricity production using available building, roof, and sunlight data.
Start with your address
Put your roof'soutput in focus.
Analyze your roof to see the existing property-specific production estimate, system size, and physical factors behind it.
The short answer
How much electricity can solar panels produce?
There is no single universal kWh figure. Solar output depends on system capacity, available sunlight, roof orientation, roof pitch, shading, location, system design, and local conditions.
SunMyRoof starts with your address and uses available building, roof, and solar data to provide property-specific context instead of asking you to guess every input yourself.
The useful distinction
kW vs. kWh: What's the difference?
kW describes system power or capacity. For example, a system might be rated at 10 kW.
kWh describes energy produced or consumed over time. A system might produce 12,500 kWh per year. System size is not the same thing as annual electricity production.
Plan with the full year
Solar output per day, month, and year.
Annual production is often more useful for planning than a single daily number. Daylight duration, sun angle, weather, snow, seasonal shading, temperature, and local climate make production change throughout the year.
When average monthly or daily equivalents are shown, they are annual averages—not forecasts for a specific month or day.
Output has context
What affects your solar output?
Sun exposure
More usable sunlight generally improves production potential.
Roof orientation
Roof direction affects how sunlight reaches panels.
Roof pitch
Tilt can influence solar exposure across a roof surface.
Shade
Trees, buildings, and roof structures can reduce available sunlight.
Geographic location
Sunlight and seasonal conditions vary from one region to another.
Rated power vs. real energy
Solar panel wattage vs. solar energy production.
A 400 W panel has a rated power figure. That does not mean it produces 400 watts continuously all day.
Actual energy production depends on sunlight and operating conditions. Two similarly sized systems can produce different annual electricity because of location, orientation, pitch, shading, roof geometry, weather, and system layout.
Why SunMyRoof starts with your roof
A property-specific starting point.
Many solar output calculators ask you to already know panel count, panel wattage, system capacity, sun hours, orientation, tilt, and losses. SunMyRoof instead starts with your address and available building, roof, and solar data to estimate your property's potential production.
Preliminary, not final
How accurate is the solar output estimate?
The production estimate is based on available data and is intended for preliminary planning. Actual results can differ with selected equipment, final layout, installer design, shading changes, roof obstructions, weather, snow or soiling, equipment performance, system losses, and maintenance.
It is not guaranteed production, an engineering design, or a contractor quote. Final installation plans should be professionally verified.
Questions, answered plainly
Solar output FAQs
How much electricity do solar panels produce per year?
Annual production varies with system size, available sunlight, shading, roof orientation, location, and other property-specific factors. An address-based analysis can provide a more useful starting estimate than one universal kWh figure.
How many kWh does a solar panel produce per day?
There is no single fixed daily number. Production changes with sunlight, season, location, panel characteristics, and weather. Any daily figure shown here is an annual average equivalent, not a forecast for a specific day.
What is the difference between kW and kWh?
kW describes system power or capacity, such as a 10 kW system. kWh describes energy produced or consumed over time, such as 12,500 kWh per year. System size is not the same thing as annual electricity production.
Does roof direction affect solar panel output?
Yes. Roof orientation affects how sunlight reaches panels, although multiple roof directions may still be viable. Orientation is considered alongside shade, pitch, roof layout, and location.
Does shade reduce solar panel production?
Yes. Trees, nearby buildings, roof structures, and other obstructions can reduce available sunlight and output. The effect depends on where and when shade falls across the roof.
Is SunMyRoof’s production estimate guaranteed?
No. It is a preliminary estimate based on available building, roof, and sunlight data—not guaranteed production, an engineering design, or a contractor quote. Final installation planning should be professionally verified.