Estimate daily, monthly, and yearly solar energy production.
Auto-set from the location selector, but it can be adjusted manually.
This can reflect inverter losses, dirt, shade, wiring, and other practical losses.
Daily Output
11.25 kWh
Monthly Output
337.50 kWh
Yearly Output
4106.25 kWh
CO₂ Saved
1713.56 kg/year
Bigger systems, stronger sun exposure, and better efficiency all increase energy output, but real roofs and local conditions can change actual results a lot.
Solar panels generate electricity through photovoltaic cells, but actual output depends on more than panel wattage alone. Sun exposure, system losses, shading, orientation, and weather all influence what a system really produces.
Carbon savings depend on what local grid electricity would otherwise have been used. Different regions have different electricity mixes, so this is best treated as a useful estimate rather than an exact result.
This solar panel calculator estimates how much electricity a solar system could generate based on panel wattage, panel count, sunlight hours, and overall efficiency. It provides quick daily, monthly, and yearly estimates that can help with early-stage planning.
It is useful for comparing different system sizes, checking whether a roof setup may cover part of household energy demand, and getting a rough idea of long-term energy production.
A common estimate multiplies four main elements:
The basic structure is: panel power × panel count × sun hours × efficiency with the result converted into kilowatt-hours.
This does not replace a detailed site survey, but it is a practical first-pass estimate.
Two systems with the same rated wattage can perform very differently in practice. Output is shaped by a mix of physical, technical, and environmental conditions.
Peak sun hours are not the same as total daylight hours. They represent the equivalent number of hours per day when sunlight intensity averages around full solar irradiance.
That is why a location can have far more than 5 hours of daylight but still be estimated at around 5 peak sun hours for solar production purposes.
These are planning figures rather than guaranteed outcomes.
A useful next step is to compare annual solar output with actual electricity usage. For many homes, electricity consumption varies strongly by heating system, appliances, air conditioning, and occupancy.
Energy production is only one part of a solar decision. A full appraisal usually also considers:
A system with strong output may still need careful financial review, especially where roof work, batteries, or inverter replacement are part of the project.
A simple estimate is panel wattage × number of panels × peak sun hours × system efficiency, then divide by 1,000 to convert watt-hours to kilowatt-hours.
Peak sun hours are a simplified way of expressing the amount of solar energy available in a day. They are not the same as total daylight hours.
Real systems lose energy through inverter inefficiency, wiring losses, dirt, shading, temperature effects, and other practical factors.
It is useful for estimation and comparison, but actual production depends on roof angle, orientation, shade, local weather, panel type, and installation quality.
Sometimes, but it depends on system size, energy usage, battery storage, and local sunlight conditions.
For connected calculations, see the Electrical Unit Converter, Area Converter, and Concrete Calculator.
This tool is most useful for quick estimates and option comparison. For a precise system design, site-specific assessment, shading review, and local production modelling are still needed.