# How many Solar Panels are needed to power a House?

The installation of **renewable energy** are becoming more and more important when it comes to **reforms** at home.

One of the most demanded works in homes is the installation of **solar panels** but,**how many solar panels are needed to power a house**? We tell you all the keys.

The first of all is to ask ourselves why we want the **photovoltaic panels**. do**Save energy**? Sell it? do**Minimize our carbon footprint**?

All these questions will determine the **number plates** that we will install

## What Factors do I have to take into account to Install Solar Panels?

The main factors you have to take into account are:

### 1. Meters that your Roof has for the Installation of the Panels

The **solar panels** They usually occupy a **two square meters of surface**. This determines the number of **panels** that are installed and also their **power**.

That is, if you have less meters your **photovoltaic panels** They will need to be more powerful. In this way, you can complement the lack of space.

If your roof is somewhat smaller and some **high power plates** do not fit within your budget, there are also other alternatives.

For example, if you have more land, you can install them on it. There is also talk of **shared dashboards** with other nearby buildings.

This would serve to counteract the **lack of space** of a building on another nearby roof that does not take advantage of yours. This is done more in **parking lots**.

### 2. Climate of the Area in which you live and Hours of Light that you have

There are several **measures to obtain the maximum performance of your photovoltaic installation.**

The **panel orientation** and the **geographic situation** from your **living place **There are two determining factors.

On the one hand,** south facing solar panels produce more energy**. Specifically, a **54% **more than those facing north.

On the other hand, the** solar irradiation** in the different areas of Spain it varies. An installation in the south can yield up to 27% more than one in the north.

For example, one **facility **common in Seville of 3000 kWh per year may need 10 **panels**. However, the same installation in Asturias would need two **panels **plus.

Another factor to take into account is the **solar panel tilt**. This tilt varies depending on the angle of the sun. It is usually around 10º for summer and 50º for winter.

**Change the tilt** constantly tends to be complicated. Therefore, a global approximation of 34.5º makes energy production profitable.

### 3. Energy that your Home consumes

It is the most important aspect when **calculate how many solar panels are needed to power a house**.

Of course, it is necessary to calculate** taking into account the hours that will receive solar radiation**. If possible, this consumption could even be discriminated during daylight hours.

This is because **the same energy use is not made at night than during the day**. Nor is the same use made in summer as in winter.

For this reason, experts recommend **add 25% to the total energy consumed**. In this way you could reach 100% of the use of clean energy generated on your roof.

In order to know the average consumption, **check the electricity bill**. It will show the kWh (kWatios used per hour). Even though this **consumption **It also depends on the month you look at.

Therefore, the ideal is to make an average with the consumption of all the months of the year. to that **consumption **we add the **surplus **which we have already talked about.

Once we have the **annual consumption**all we have to do is divide by 365. Thus, we will obtain the **daily consumption**. Then, we divide the obtained by 24. The result will be the **consumption per hour**.

Once this is done, we would already know the kWh we need in our **solar panels**.

### 4. Power of our Panels

The **panel power** may vary. Depends on the amount of **panels **that we want to put and also its use.

it won’t be the same **power **for a house you want **self-consumption of energy** that for another that only needs the **Energy **to heat water.

This power is usually around 250W and 300W. However, there are more and more powerful solar panels. One of these newer home solar panels can reach up to **650W**.

## How many Solar Panels do I need?

We already know the factors that influence the location of the panels. Also the energy we need to obtain from our photovoltaic installation. Now, we only have to know **how many solar panels are needed **to power a house.

As we have seen, **it all depends on the location**. However, we can make a rough estimate of the average number of households.

According to him **IDAE**the average consumption of Spanish households is **8000kWh/year**.

For this calculation we will take plates of **320W**. These are usually one of the **cheaper options. **

We will take the case of Murcia, where the rate of **Peak Sun Hours **It is** 1800 HSP.**

So the **power **that the house needs would be: House Consumption/HSP= 4,400 Watt.

Now divide the **total power **between **panel power**: 4,400/320=13.75

Therefore we need **13.75 solar panels**. That is, between 13 or 14.

In general, if your consumption is up to **2000 kWh **you will need between** 2 and 4 panels.** If your energy consumption is **between 2000 and 5000 kWh, **you will need between **4 and 7 panels**.

From **5000 kWh**the panels you will need **they will be from 7 onwards**.

Or, what is the same, if you pay **€50 on your lu bill**z, you need **between 3 and 4 panels**. If the amount of your bill is **between €50 and €100, there are 6 panels**. If your bill is **more than €100, you need from 7 onwards.**

Once we have this, all we have to do is adapt it to the meters that we have on our roof.

If we have less space, a few **solar panels **of higher power. For example, yes **we double the power of the panels,** **the number of plates we will need will be half.**

Read more: What are solar panels, how do they work and what is their future?