Enter your monthly electricity units — or just your monthly bill — and get the full picture: the solar system size your home needs, how many panels, what it should cost installed, and roughly how long it takes to pay for itself.
How the size is worked out: monthly units ÷ 30 days ÷ peak sun hours ÷ 0.78 system factor (inverter, wiring, heat and dust losses), rounded up to the next standard inverter size. The installed rate starts at Rs 130,000 per kW — the middle of the late-2026 market range of roughly Rs 110,000–150,000 per kW for on-grid systems with net metering. Change any rate to match a quote you have received. Prices checked November 2026 — solar prices change fast.
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Estimate only. The cost is for a standard on-grid system with net metering — hybrid systems with batteries cost more. Payback is a simple estimate that assumes most solar power is used inside the home; under net billing (2026 rules) exported units earn only about Rs 11 each, so real payback is often longer. A roof survey and the net-billing application with your electricity company (DISCO) are separate steps.
At this calculator's default settings — 5.0 peak sun hours, 0.78 system factor, 585 W panels, and the November 2026 market range of Rs 110,000–150,000 per kW installed:
| System | Panels (585 W) | Units / Month | Cost Range |
|---|---|---|---|
| 3 kW | 6 | 351 | Rs 3,30,000 – 4,50,000 |
| 5 kW | 9 | 585 | Rs 5,50,000 – 7,50,000 |
| 10 kW | 18 | 1,170 | Rs 11,00,000 – 15,00,000 |
Match the system to your bill: a home using about 350 units a month fits a 3 kW system; about 600 units fits 5 kW; about 1,200 units fits 10 kW. Under net billing, sizing close to your daytime use pays back faster than oversizing.
Check it yourself: 600 units a month → 600 ÷ 30 ÷ 5 ÷ 0.78 ≈ 5.1 kW exact, so a 6 kW system is recommended, making about 702 units a month.
Short answer for anyone searching "solar system price in Pakistan": a complete on-grid system costs about Rs 110,000–150,000 per kW installed in November 2026 — roughly Rs 5.5–7.5 lakh for the popular 5 kW size. Where that figure comes from:
With this calculator's careful assumptions — 5 peak sun hours and a 0.78 system factor for inverter, wiring, heat and dust losses — 1 kW makes about 117 units a month. In strong summer months it can be higher, and in foggy winter weeks lower; installers often quote 120–130 units using sunnier assumptions.
500 units a month needs 500 ÷ 117 ≈ 4.3 kW of panels, so the calculator recommends the next standard size: 5 kW — about 9 panels of 585 W. The small extra capacity covers cloudy days and future load growth.
With today's standard 585 W panels, a 5 kW system needs 9 panels (9 × 585 W = 5,265 W). With 550 W panels it takes 10, and with larger 650 W panels only 8. This calculator lets you pick the panel wattage.
For new connections, NEPRA replaced net metering with net billing in February 2026. Under net billing you still export extra units to the grid, but they are credited at a low national average rate (about Rs 11 per unit), while the units you buy back cost the full retail price. So using your own solar power directly saves far more than exporting it — and a system sized to your daytime use pays back faster than an oversized one.
At November 2026 market rates of about Rs 110,000–150,000 per kW installed, a complete 5 kW on-grid system costs roughly Rs 5,50,000 to 7,50,000 — panels, inverter, structure, wiring, installation and net-billing setup. It uses 9 panels of 585 W and makes about 585 units a month. A hybrid 5 kW system with lithium batteries costs noticeably more.
No. The payback shown here is a simple estimate — total cost divided by your current monthly bill — and it assumes most of the solar power is used inside the home. It does not count net-billing export rates, future price changes, panel cleaning, or inverter replacement after some years. Treat it as a rough guide; a site survey and written quotes from two or three installers will give you firmer numbers.
Yes, completely free. All calculations happen inside your own phone or computer — nothing you type is uploaded anywhere.