How many solar panels do I need for a 100m2 house?

If you have a 100m² house and are considering installing solar panels, you’re probably wondering how much such an installation might cost.

While the size of the house may seem like a good starting point, the price and features of the installation depend on other, more important factors.

In this article, we’ll tell you everything you need to know to make an informed decision and start enjoying self-consumption in your home.

Factors that affect the cost of a solar installation

1. Energy consumption

The electricity usage of your home is the most crucial factor in determining the type of solar installation you need.

For example, a family of 3-4 people with an average annual consumption of 4,000 kWh will require an installation with a capacity of 4 to 5 kWp. This factor is more significant than the size of the house since two homes with the same surface area can have vastly different consumption levels depending on the number of occupants, the appliances used, and their lifestyle.

A household with energy-efficient appliances or alternative heating systems will require less installed capacity, which directly impacts the final cost of the installation.

2. Roof orientation and characteristics

A roof oriented to the south, with the right slope and no shading, ensures higher energy production, maximizing the return on investment in solar panels. However, not all roofs have these ideal characteristics.

If the roof faces east or west, or if there are shadows cast by nearby trees or buildings, optimizers or additional panels can be installed to compensate for the loss of efficiency. While this might slightly increase the initial cost, it guarantees that the system produces the necessary energy to meet your household’s consumption needs.

3. Geographic location

In Spain, solar radiation varies significantly by region. In southern areas like Andalusia or Murcia, solar panels generate more energy due to the greater number of sunlight hours, which may mean fewer panels are needed to meet the same energy consumption.

On the other hand, in northern regions, where solar radiation is lower and sunlight hours are more limited, a higher installed capacity may be necessary to achieve similar energy production. Even so, solar installations remain highly profitable thanks to the optimized design of modern systems.

Additionally, the incentives and subsidies available in many autonomous communities help offset these differences, ensuring that any home in Spain can benefit from the economic and sustainable advantages of solar energy.

What type of installation does a 100m² house need?

For a standard 100m² home with average energy consumption, it is common to install between 8 and 12 solar panels, depending on their power output, which is typically 400-450 Wp per panel. This setup requires approximately 15-25 m² of roof space.

In terms of installed capacity, systems between 3 and 5 kWp are the most common. This configuration can cover between 70% and 90% of the household’s annual electricity consumption, leading to significant savings on energy bills.

For example, a typical 4.5 kWp installation (11 panels) can generate enough energy to meet the annual consumption of an average family while significantly reducing their dependence on the power grid.

How much does a solar installation for a 100m² house cost?

The cost of a solar installation can vary depending on the specific characteristics of each project. As a reference, a 3 kWp system typically costs between €5,000 and €7,000, while a 5 kWp installation may range from €7,000 to €9,500. These prices include all the necessary components for the system: solar panels, inverter, mounting structure, wiring, labor, and permit management.

However, it’s important to note that each case is unique. As mentioned earlier, factors such as energy consumption, roof orientation, or the specific conditions of the property can significantly influence the design and cost of the installation.

For this reason, conducting a personalized study that analyzes all these variables is essential to ensure the system is optimized for your needs and provides the best long-term performance.

Go solar and start saving with Sunhero

At Sunhero, we provide a comprehensive service to make the transition to solar energy as simple as possible. Our team conducts a personalized assessment to design the installation that best suits your needs, ensuring maximum efficiency. We take care of every detail, from design and installation to managing all necessary permits.

If you want to discover how much you could save, try our solar calculator. Additionally, if you’re looking for an innovative and aesthetically appealing solution, we offer options like full black panels that combine efficiency and design. Learn more about them in our article: Full Black Solar Panels: The Latest in Photovoltaic Energy.

Making the switch to solar energy with Sunhero has never been easier. Contact us today and start saving while helping the planet!