Be careful with solar panels, if you install too many you will have a problem.
Photovoltaic solar panels are an excellent way to save money on electricity bills and to contribute to a greater respect for the environment. However, be careful with solar panels, because if you install too many, you will have a problem.
Solar energy offers numerous advantages. The most important is that you are using a renewable energy source. But there are a number of common mistakes when installing solar panels.
It is important to know how many solar panels you can install on your house, as it will allow you to optimize the initial investment while making the most of the electricity savings. But how do you know?
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Be careful with solar panels, if you install too many you will have a problem.
According to Endesa, the number of solar panels that a house needs varies between four and 18 modules of photovoltaic panels. Depending on the annual electricity consumption of the house, it is more convenient to opt for more or fewer panels to make the investment of the installation profitable.
However, in addition to consumption, there are other important factors that must be taken into account when calculating the number of solar panels that can be installed on a roof. These factors are the annual consumption of the house, the quality and performance of the panels, the type of solar panel, the power of the installation, the orientation of the roof and the geographical location.
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Annual electricity consumption
As for the main factor, the annual electricity consumption, you can make a quick estimate of your annual consumption using your last bill. For example, if the bill is for two months, multiply the total kWh consumed by six. If the bill is monthly, multiply by 12.
However, as electricity consumption is often not the same for every month of the year, you can log in to your customer area to find out exactly your annual kWh consumption.
Quality and performance of photovoltaic panels
The quality of the panels is fundamental to their performance in producing energy. Higher quality systems are more expensive, but they make better use of sunlight and are capable of producing more electricity.
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The right choice of solar panels for the house allows you to reduce the number of panels you need to install. In addition, with higher performance panels the investment of the installation is amortized faster.
Type of solar panel according to cell type
Efficiency is the capacity of the panel to produce electricity when sunlight hits it. The technology used to manufacture the cells contained in the photovoltaic panel will influence its performance, and there are three main types of panels: monocrystalline, polycrystalline and amorphous.
Monocrystalline and polycrystalline panels offer better performance and are currently the most commonly used in the installation of photovoltaic panels in homes.
Amorphous panels, on the other hand, are more economical, but have poorer performance and a shorter lifetime.
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Power of the installation
The power of the solar panels indicates the amount of electrical energy that the domestic installation is capable of producing. Normally, the power is indicated in Wp units (peak power in Watts). Thus, the total power of the installation is the sum of the power of all the panels that make it up.
Number of panels x power of each panel (Wp) = Power of the installation (Wp).
Following Endesa’s example, an optimal solar panel has a power of 300 Wp. If the installation consists of six solar panels, we have a total power of 1800 Wp. This power value corresponds to 1800 kWh of electricity per year under theoretical conditions.
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Roof orientation and inclination
In Spain, the optimal orientation of the solar panels is south, because it is the arrangement that makes the best use of solar radiation for the production of light.
If south orientation is not possible, there is no need to worry: with a southeast or southwest orientation, the loss of efficiency is only between 1% and 4%, which is perfectly acceptable.
On the other hand, with east and west orientations, the loss of efficiency can reach up to 20 or 30%, so it may be necessary to install more solar panels to achieve the required power output.
In the case of north orientations, it is important to make a very thorough preliminary study to evaluate whether it is worthwhile to install the panels.
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Geographical location of the house.
To calculate how many solar panels a house needs, it is essential to take into account its geographical location. Depending on the geographical location, the amount of solar radiation varies, which will require more or less photovoltaic modules to be installed.
In general, it is recommended to carry out a personalized study beforehand to ensure that the installation of solar panels in your home is adjusted to your energy needs, taking into account all these factors.
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Limitations on the number of solar panels on a house
Currently, there are new solar panels of higher efficiency that allow to occupy less space on the roof or in the place where you are going to make the installation. Therefore, the available surface area is not usually a problem.
That said, if you want to produce a large amount of energy, the available surface may be a problem. In such cases, it is better to have more powerful panels that generate more energy in the same number of square meters.
Source: https://www.autobild.es/noticias/cuidado-placas-solares-instalas-tendras-problema-1144015
