This calculator tool estimates your solar array size, number of panels, and space requirements based on customizable consumption, unit conversions, and location-specific peak sun hours.
Solar Panel Size Calculator
Solar Array Size: 0.00 kW
Panels Needed: 0
Required Area: 0.0 m²
About
This solar panel calculator helps you estimate the size of solar arrays, how many panels you need, and whether your roof can accommodate them. Input your electricity consumption, desired bill offset, and environmental factors to get accurate results based on local sun hours.
We also provide handy tools like:
- Unit converters for area, power, and time
- Location-based solar radiation data
- Quick links to other utilities
Other Useful Calculators
FAQs
What are peak sun hours?
Peak sun hours equal the equivalent hours per day of solar irradiance at 1 kW/m².
How do peak sun hours affect my solar array?
Peak sun hours represent equivalent hours of 1 kW/m² sunlight. Knowing this helps size your system to meet daily energy needs.
What is the environmental factor?
The environmental factor accounts for losses due to dust, temperature, and shading. Typical values range from 70–90% in residential installations.
Can I use this on mobile?
Yes, this responsive calculator works on all modern devices, including smartphones and tablets.
What units can I enter for area and power?
You can enter area in m², ft², yd², km², mi² and cm², in². Power inputs support Watts (W) and kilowatts (kW).
How accurate are these estimates?
Results are based on average sun hours and typical efficiency factors. For precise project planning, consider a professional site assessment.
How do I determine the right panel wattage?
Panel wattage depends on your energy needs and roof space. Common residential panels range from 250W to 400W; higher wattage yields fewer panels for the same output.
Can I adjust for future energy needs?
Yes, simply increase your consumption input or desired offset percentage to size the system for projected usage.
Do I need professional installation?
While the calculator provides estimates, a certified installer will handle permits, structural reviews, and final system design.
Created by the Team TheEducationistHub | Reviewed by Sadiq Saleem
Last Updated on: 8th May 2025