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Solar system size calculator — the free, instant tool for
homeowners and businesses to find the perfect solar setup.
Free Solar System Size Calculator
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| Item | Specification | Est. Cost |
|---|---|---|
| Total Estimated System Cost | — | |
How Much Solar Do I Need? Complete Guide 2026
Our solar system size calculator is a free tool that helps homeowners, farmers, and business owners find out exactly how many solar panels they need, what inverter size to buy, and how much battery storage is required — without needing any technical knowledge. Using our solar system size calculator makes this process instant and error-free.
How to Calculate Solar System Size
The formula is simple: Take your daily electricity usage in kWh and divide it by the peak sun hours in your area.
Then multiply by 1.25 to account for system losses. This gives you the required solar system size in kilowatts (kW).
For example, a home using 300 kWh/month (10 kWh/day) in Pakistan with 6 sun hours needs a 10 ÷ 6 × 1.25 = 2.08 kW solar system size calculator result — meaning about 7 panels of 330W each.
What Size Solar System Do I Need for My Home?
This depends on your monthly electricity consumption. As a general guide:
- Small home (100–200 kWh/month): 1.5–2.5 kW system, 5–8 panels
- Medium home (300–500 kWh/month): 3–5 kW system, 10–16 panels
- Large home (600–1000 kWh/month): 6–10 kW system, 18–30 panels
- Business / commercial: 10 kW and above, depending on usage
On-Grid vs Hybrid vs Off-Grid — Which Should I Choose?
On-Grid systems are the most affordable and best for areas with a reliable electricity supply. You save on your bill and can export excess power.
Hybrid systems add a battery bank so you have power during outages — ideal for areas with frequent load-shedding like Pakistan and India.
Off-Grid systems are for remote areas with no grid connection at all — they require the most panels and the largest battery banks. Use our solar system size calculator to find the right system type for your needs.
How Long Do Solar Panels Take to Pay Back?
In high-sunshine countries like Pakistan, Saudi Arabia, and India, solar systems typically pay back in 4–7 years.
In Europe and North America, payback is typically 7–12 years.
Since solar panels last 25+ years with warranties, most users enjoy 15–20 years of essentially free electricity after payback.
Results are estimates only and not professional engineering advice. Always consult a certified solar installer before purchasing. Privacy Policy · Disclaimer · About Us