How this solar planner works
Use the roof tools to create a realistic rooftop layout, place solar panels and obstacles, then simulate sun position, weather, dust and shading. The app calculates live power output, daily units, monthly generation, savings, payback and 25-year degradation.
How to place solar panels on roof
Choose a roof template or draw your own shape. Add panels one by one, add rows, or auto-fill the available roof area. Drag, rotate and duplicate panels while keeping clearances around obstacles.
Best solar panel direction in India
South-facing panels are generally best in India. South-east and south-west also perform well. East and west orientations work but usually reduce annual energy, while north-facing roofs are less efficient.
Best solar panel tilt in India
The ideal tilt is usually near your latitude minus 5 to 10 degrees for annual generation. Flat panels may collect more dust, while steep tilt can reduce terrace capacity.
Weather and dust impact
Weather changes available solar radiation instantly. Clear sky gives the highest output, while clouds, haze and rain reduce generation. Dust lowers efficiency until panels are cleaned.
Shade impact
Obstacles and nearby objects can create shadows that reduce panel output. The planner visualizes sun movement, shadow direction and shaded panel output using a simple geometric model.
Solar panel degradation
Solar panels slowly lose output each year. The degradation chart shows estimated 25-year performance based on the selected yearly degradation rate.
Savings calculation
Enter electricity rate, system cost and subsidy to estimate savings and payback. The calculation uses panel capacity, peak sun hours, direction, tilt, weather, dust, shading, wiring, inverter efficiency and degradation.
FAQ
How many solar panels can fit on my roof?
Use auto-fill to estimate panel count based on roof area and selected panel size. Actual fit depends on roof shape, access clearances, structure and installer design.
Which direction is best for solar panels in India?
South is best for most Indian rooftop systems. South-east and south-west can also perform well.
What is the best tilt angle for solar panels?
Best tilt is close to latitude minus 5 to 10 degrees. For Noida and nearby cities, 15 to 25 degrees is usually a useful range.
How much power does a 5kW solar system generate?
A 5kW system in good Indian conditions often generates roughly 18 to 24 kWh per day, depending on weather, orientation, tilt and shading.
How does shade affect solar panels?
Shade can reduce output significantly, especially when it crosses multiple panels or strings. This planner estimates shading as an educational visual model.
How much dust reduces solar generation?
Light dust may reduce output a few percent, while heavy soiling can reduce generation much more until panels are cleaned.
Can I calculate monthly and yearly solar units?
Yes. The tool estimates daily, monthly and yearly units based on layout, city, panel type and loss assumptions.
Does this tool work for Indian cities?
Yes. It includes presets for major Indian cities and supports manual latitude and longitude.
Can I download a solar report?
Yes. Export the roof layout as PNG, download a PDF report, or print a report from the browser.
Is this calculation accurate?
This tool provides an educational estimate only. Actual generation depends on site survey, roof structure, inverter design, wiring, DISCOM approval, local weather, shading, installation quality, panel manufacturer data and maintenance.
Disclaimer
This tool provides an educational estimate only. Actual solar generation depends on detailed site survey, roof structure, inverter design, wiring, DISCOM approval, local weather, shading, installation quality, panel manufacturer data and maintenance. Consult a certified solar installer before purchase.