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Discover How Many Solar Tiles Are Needed to Eliminate Your Electricity Bill, Considering Your 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 its 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 electricity bill?
To determine the exact number of solar tiles, three main factors need to be considered: the average daily energy consumption of your home, the average solar irradiation of the location 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 Obtain Average Daily Consumption
First, check your electricity bill to determine your monthly consumption and divide by the number of days in the month to obtain average daily consumption. For example, a consumption of 300 kWh per month results in about 10 kWh per day.
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Average solar irradiation: this data can be obtained through databases such as CRESESB. In Rio de Janeiro, for example, the average irradiation is 4.93 kWh/m² per day, which equals approximately 4.93 hours of full sun per day.
Typically, a photovoltaic system can have about 20% to 25% losses due to factors such as dirt and non-ideal tilt of the tiles. Considering a 25% loss, the effective efficiency of the system would be 75%.
Using this data, the formula to calculate the required system power would be:
Required Power = (Daily Consumption) / (System Efficiency × Daily Irradiation)
Replacing with the values from 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 the typical installation of 7.5 to 8.5 tiles per square meter, this would require about 36 m² of space on your roof. A solar tile is currently costing on average 700 reais.
Adopting solar tiles not only contributes to reducing your electricity bill, but also promotes sustainability by using a clean and renewable energy source. With the growing popularity of this technology, the positive environmental impact is an additional incentive for those considering this energy alternative.
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