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Discover how many solar panels are possible to generate 1000 kWh of solar energy per month, saving on your electricity bill

Written by Bruno Teles
Published 29/05/2024 às 15:57
Discover how many solar panels are possible to generate 1000 kWh of solar energy per month, saving on your electricity bill.
Photo: Canva/Disclosure

If you are tired of paying too much on your electricity bill and want to avoid rising energy rates, solar energy could be the ideal solution for you. But how many solar panels do you need to install to generate 1000 kWh per month?

Solar energy is a great way to reduce your costs of electricity. But before installing solar panels, it is important to calculate how much you will need to meet your energy consumption.

To calculate the number of possible solar panels, you will need to know three things: your average daily consumption, the solar irradiation of your city and the efficiency of the solar system.

Calculate average daily consumption

First, take your electricity bill and get your average monthly consumption in kWh. For this example, we will use an average monthly consumption of 1000 kWh. Divide this value by 30 (number of days in the month):

  • Average daily consumption = 1000 kWh / 30 = 33,33 kWh per day.

Solar irradiation is the amount of solar energy available at your location. To find out the irradiation of your city, you can use the website Cresesb, which has solar irradiation data for all of Brazil. For Salvador, Bahia, the average daily solar irradiation is approximately 5,34 kWh/m²/day.

The efficiency of the photovoltaic system takes into account losses such as dirt on the plates and angle deviations. Normally, we consider a loss of 25%, so the efficiency of solar panels will be 75% or 0,75.

Calculate total system power

To calculate the total system power, you need to divide the average daily consumption by multiplying the system efficiency by solar irradiation. So, the system power is equal to the average daily consumption divided by (system efficiency sometimes solar irradiation).

Substituting the values, we have:

  • The system power is equal to 33,33 kWh per day divided by (0,75 times 5,34 kWh per square meter per day), which results in 8,32 kWp (kilowatt-peak).

Define the model of the solar panels

Now we need to choose the model of the solar panels. We are going to use a panel with a power of 665 Wp (one of the most powerful on the market). To find the number of solar panels, you divide the total power of the system by the power of each plate.

The number of solar panels is equal to the total power of the system divided by the power of each plate. Substituting the values, we have:

  • The number of plates is equal to 8320 Wp divided by 665 Wp, which results in approximately 12,5 plates. We rounded up to 13 solar panels to generate a little more energy and guarantee a safety margin.

To generate 1.000 kWh per month in Salvador, Bahia, you will need 13 solar panels of 665 Wp each. Now do the calculation for your city and see how many solar panels you need.

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Bruno Teles

I talk about technology, innovation, oil and gas. I update daily about opportunities in the Brazilian market. Agenda suggestion? Send it to brunotelesredator@gmail.com

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