The Complete Solar Panel Size & Roof Space Guide for Homeowners in India

Introduction

Going solar is the need of the hour. On top of that, proper installation ensures that homeowners get the optimal output and energy benefits. Let’s look at this brief guide to determining the cost and roof space required for solar panels.

What Does Solar Panel Size Mean?

Solar panel size refers to the physical dimensions and output capacity of the panel. For example, the solar panel size for a home measures approximately 1.7 m x 1 m and produces 300 to 400 W. However, this size is different for commercial and industrial panels.

Standard Roof Space Requirement for Solar Panels in India

Now that you have decided to switch to solar, the next step is to calculate the roof space required for solar panels. As a thumb rule, we can consider the solar panel to cover an area of 20.86 sq ft. Next, multiply the surface area by the total number of panels required for your roof. This will give you an idea of the roof space required for solar panels.

How to Decide the Right Solar Panel Size for Your Home

Estimating the right size of solar panel is a challenging task. As a solar EPC contractor, we work with our solar engineers to study every aspect of your home energy consumption and design the best-fit panels for your needs. Going for the optimal number of solar panels increases the output while lowering the cost of the rooftop solar system. Here are a few governing factors that determine the panel size:

Average energy consumption of your home

Understanding your energy requirements is the first step to finding the right panel size. We design all our panels to produce equivalent (or more) electricity than the annual grid power consumption.

Roof space and orientation

While sloped roofs perform better than flat ones, homeowners must ensure that the roof is getting maximum hours of sunlight for maximum output.

Sunlight availability

The panels must be oriented to receive at least 5 hours of direct sunlight.

Panel efficiency and future needs

It’s always recommended to consider your future power needs when installing the panels.

Cost Impact Based on Solar Panel Size

The cost of a rooftop solar system is directly proportional to the electricity production. Here is a brief outline of the cost outline along with power needs:

• 1 kW- Rs 50,000 to Rs 70,000 ( ideal for small houses)
• 2 kW- Rs 80,000 to Rs 1.2 lakhs ( ideal for small to medium houses)
• 3 kW- Rs 1.3 lakhs to Rs 2 lakhs (up to 3BHK homes)
• 5 kW- Rs 2.3 lakhs to Rs 3 lakhs ( large homes)

Step-by-Step Method to Calculate Roof Space & Solar Size

To do this, first calculate the total electricity consumed by your house over the last 12 months. Divide the value by 12 to get the average monthly consumption in kWh.

In the next step, divide the monthly average consumption by the monthly average capacity of a 1 kW solar system. This determines the total system capacity you need for your home.

Lastly, divide the total solar system capacity by the individual solar panel capacity.

Breaking down the calculation further:

Say for example your annual consumption is 450 + 400 + 400 + 400 + 450 + 500 + 550 + 500 + 450 + 400 + 350 + 450 = 5,200 units

Average monthly consumption = 433 units.

Dividing 433 by 120 units per kW gives approximately 3.6 kW system capacity.

With 550-watt panels, you will need 6 to 7 solar panels for your home.

Hence, the total rooftop area will come as 125.16 sq. ft. or 146.02 sq. ft. (20.86 sq. ft. X 6 Panels or 20.86 sq. ft. X 7 Panels)

Common Mistakes Homeowners Should Avoid

Overlooking the following mistakes can take a heavy toll on homeowners:

Not assessing roof conditions

Checking roof conditions is essential to understand its weight-carrying capacity. Our experts check the roof orientation, panel position, and tilt angle to determine whether roof repair is needed.

Choosing the wrong panel

There are a variety of solar panels available in the market, and only an engineer can suggest the best one for your home.

Not checking inverter quality

We always provide high-quality inverters that can withstand extreme fluctuations. Choosing a poor-quality inverter can result in voltage disturbances and lower energy production.

Conclusion

The roof dimensions and solar panel size for the home play a crucial role in solar installations and govern the energy output of your home. Choose reliable solar installers like us and avoid operational issues to ensure stress-free solar power for every need.