Solar System Size Calculator
How many kW? Panels, cost & savings estimate.
About this calculator
With electricity tariffs climbing, a home solar system is one of the fastest ways for a Pakistani household to cut its bill. This calculator works backwards from your monthly units — or from the appliances you run — to suggest the system size in kilowatts that covers your consumption, along with the number of panels, approximate installation cost and expected monthly savings.
It accounts for real-world Pakistan conditions: strong sunshine in most of the country, space on typical rooftops, and net metering, which lets you sell extra units back to the grid through your DISCO. The result is a practical starting point for quotes — so when an installer suggests 10 kW for a 5-marla house, you will know whether that is sensible or oversold.
How to use
- Enter your average monthly electricity units from recent bills.
- Or list the appliances you want solar to power.
- See the recommended kW size, panel count and rough cost.
- Compare the monthly savings with the cost to judge payback time.
Frequently asked questions
How many kW does a 5-marla house need?
A typical 5-marla home using 300–500 units a month needs roughly 3–5 kW. With net metering, sizing to your average bill usually gives the fastest payback.
What does solar cost per kW in Pakistan?
Installed on-grid systems generally run around Rs 120,000–150,000 per kW depending on panel brand, inverter and structure quality. Get multiple quotes — prices vary widely between installers.
What is net metering?
Net metering is a two-way meter arrangement with your DISCO (LESCO, IESCO, KE etc.) that credits you for surplus solar units exported to the grid, offsetting the units you import at night.
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