TopToolsAiEstimate the solar system size, installation cost and monthly savings for your home, based on your average electricity usage, local sun hours, and installation price per kW. A home using 600 units a month in an area with 5 peak sun hours a day typically needs around a 4kW system, which at roughly PKR 180,000 per kW installed comes to about PKR 720,000 upfront, often paid back within 4-6 years through lower electricity bills.
Last updated: 1 Sep 2026
Frequently asked questions
How do I find my average monthly units?
Check the "units consumed" figure on a recent electricity bill — using an average of the last 3-6 months gives a more reliable estimate than a single bill.
What are "peak sun hours" and how do I know mine?
It's the number of hours of strong, usable sunlight your area gets per day (not just daylight hours) — 5-6 is a reasonable default for most sunny regions.
Does this include batteries for backup power?
No — this estimates a basic grid-tied system sized to your usage. Battery backup adds significant extra cost not included in this figure.
How is the payback period calculated?
It divides the installation cost by your estimated monthly savings on electricity, giving a rough number of months until the system pays for itself.
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