Solar calculator
What size system do you need?
Move the slider to your monthly bill for a first estimate of system size, roof space and generation.
6.5 kWSystem size that would generate the units you use
780Units generated a month
12Panels of about 585 W
520 sq ftUnshaded roof needed
4.2 tCO₂ avoided a year
Rs 421,200Value of that power a year at your rate, if you use it all yourself
This is a first estimate, based on about 120 units a month from each kilowatt of panels, averaged over the year. Your real system size depends on your roof, shading and how much power you use during the day. A site survey settles it.
How the estimate works
The calculator works out how many units you use from your bill, then finds the system size that would generate the same number over a year.
- Each kilowatt of panels generates about 120 units a month, averaged over a year in Pakistan.
- Panels are assumed to be about 585 watts each.
- Each kilowatt needs roughly 80 square feet of unshaded roof.
- Carbon savings use 0.45 kg of CO₂ for every grid unit replaced.
- Under net billing, units you export earn less than units you use yourself, so the yearly value assumes you use the power on site.