How to Calculate the Size of a Solar System for My Home?

Correct system sizing ensures optimal performance and faster returns.

Step 1: Check Monthly Electricity Consumption

Review your last 6 months’ electricity bills to find average monthly units (kWh).

Step 2: Estimate Required System Capacity

Approximate formula:

1 kW solar system ≈ 120–150 units/month

Step 3: Check Rooftop Area

Average space required:

• 1 kW ≈ 80–100 sq. ft.

Step 4: Consider Future Needs

Plan for:

• Electric vehicles

• Additional appliances

• Family expansion

Step 5: Use a Solar Calculator

Online calculators provide quick estimates using standard assumptions.

Conclusion

Accurate sizing ensures better savings, efficiency, and long-term performance.