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Find out how many solar tiles are needed to eliminate your electricity bill, considering daily energy consumption, solar irradiation in your region and the efficiency of the photovoltaic system, with a practical example using the city of Rio de Janeiro.
With the advancement of photovoltaic technology, the solar tiles offered by Tégula Solar, the first of their kind in Brazil, have become increasingly popular among consumers seeking energy efficiency and sustainability. But, after all, how many tiles are needed to completely eliminate your home's electricity bill?
To determine the exact number of solar tiles, three main factors need to be considered: your home's average daily energy consumption, the average solar irradiation where you live, and the overall efficiency of the photovoltaic system.
First, check your electricity bill to determine your monthly consumption and divide by the number of days in the month to get your average daily consumption.
First, check your electricity bill to determine your monthly consumption and divide by the number of days in the month to get your average daily consumption. For example, a consumption of 300 kWh per month results in around 10 kWh per day.
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Average solar irradiation: this data can be obtained through databases such as the CRESESB. In Rio de Janeiro, for example, the average irradiation is 4,93 kWh/m² per day, which is equivalent to approximately 4,93 hours of full sun per day.
Typically, a photovoltaic system can have around 20% to 25% losses due to factors such as dirt and non-ideal inclination of the tiles. Considering a loss of 25%, the effective efficiency of the system would be 75%.
Using this data, the formula to calculate the required power of the system would be:
Required Power = (Daily Consumption) / (System Efficiency × Daily Irradiation)
Replacing the values in the example, we would need a system of approximately 2,7 kWp.
The next step is to calculate how many solar tiles are needed
With the required power defined, the next step is to calculate how many solar tiles are needed. If each solar tile has a power of 10 Wp, you would need approximately 270 tiles for a 2,7 kWp system. Considering a typical installation of 7,5 to 8,5 tiles per square meter, this would require a space of around 36 m² on your roof. A solar tile costs an average of 700 reais.
The adoption of solar tiles does not just contribute to reduce your electricity bill, but also promotes sustainability by using a clean and renewable energy source. With the increasing popularization of this technology, the positive environmental impact is an additional incentive for those considering this energy alternative.
