Pakistan Solar System Size Calculator
Find the right solar system size in kW for your home in Pakistan from your monthly units or bill — panel count, inverter size, battery backup and cost range.
About the Pakistan Solar System Size Calculator
With electricity tariffs climbing and load-shedding still a reality, solar is the biggest home investment decision in Pakistan right now — and the first question is always 'kitne kW ka system chahiye?'. This calculator sizes it from your actual usage: enter your monthly units (kWh) from your bill, or just the bill amount and per-unit rate.
The sizing uses Pakistan's typical 4.5 peak sun hours per day plus a 20% buffer for inverter, wiring, dust and heat losses — the same rule of thumb reputable installers use. You get the recommended kW size, the number of panels (default 580W modules, editable), a suggested inverter rating and a rough installed cost range at an editable per-watt price.
Planning for load-shedding? Enable the battery section to size a battery bank in Ah at 24V or 48V for the essential load and backup hours you want. Solar prices and net-metering rules change frequently in Pakistan, so every assumption in this tool is editable.
How to Use the Pakistan Solar System Size Calculator
- 1Enter your monthly units from the electricity bill — or the bill amount and per-unit rate.
- 2Adjust the panel wattage and per-watt price if you have quotes.
- 3Read the recommended system size, panel count, inverter size and cost range.
- 4Optionally enable battery backup and enter your essential load and hours needed.
Frequently Asked Questions
How many solar panels do I need for 1000 units per month?
About 1000 units/month is ~33 units per day, which needs roughly a 8.9 kW system after the 20% loss buffer — around 16 panels of 580W. The calculator shows the exact count for your panel wattage.
What size solar system do I need for 500 units?
Roughly 4.4–4.5 kW — in practice installers would quote a 5 kW system with 8–9 panels of 580W and a 5–6 kW inverter. Enter 500 in the calculator to see the full breakdown.
How much does a 5kW solar system cost in Pakistan?
At the default Rs. 90 per watt installed, a 5 kW on-grid system lands around Rs. 380,000–520,000. Prices vary by city, panel brand and inverter tier — and hybrid systems with batteries cost significantly more — so edit the per-watt price with your actual quotes.
Why does the calculator use 4.5 peak sun hours?
Most of Pakistan averages 4.5–5.5 peak sun hours daily across the year. Using 4.5 with a 20% loss buffer gives a conservative size that still covers winter and hazy days in cities like Lahore and Karachi.
Do I need batteries with a solar system?
Not for net-metered on-grid systems — the grid acts as your battery, but you lose power during load-shedding. If outages matter, use the battery section to size a bank for your essential load (fans, lights, WiFi) for the outage hours in your area.
What inverter size should I get?
Roughly equal to or slightly above your array size — the tool suggests the next standard rating (e.g. 6 kW inverter for a 5.5 kW array). Slight panel oversizing relative to the inverter is normal and improves morning/evening output.