How many SOLAR PANELS do I need to install at home? [Solar Energy]
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Okay, to break down the sizing of the solar energy system into 6 steps, let's first calculate it manually so you can learn each step. Then I'll use the spreadsheet to perform the calculations, which we'll do now, all in 1 second.
To calculate the power of my solar energy system, I will use the following equation:
Power = E (average daily consumption) / (Imd (average irradiance) Solar energy system efficiency)
Let's go to the first step:
1st STEP to calculate how many SOLAR PANELS I need to install - CALCULATION OF AVERAGE MONTHLY CONSUMPTION
Take an energy bill; it has a field that shows your consumption history. With this history, we will know how much energy you or your client consumes on average every month.
So, if my solar energy system generates 344kWh per month, it would generate 100% of the electricity I consume.
2nd STEP to calculate how many SOLAR PANELS I need to install - CALCULATION OF AVERAGE DAILY CONSUMPTION
Now we need to find out how much energy our solar energy system needs to generate per day. To do this, simply divide the monthly consumption value by the number of days in the month. On average, if you divide 365, which is the number of days in a year, by 12 months, you get 30.4 days per month. Therefore:
E = 344/30.4 = 11.3 kWh/Day
So I need a solar energy system that generates 11.3 kWh per day. So far, so good?
STEP 3 to calculate how many SOLAR PANELS I need to install - Solar Irradiation
It is necessary to find out the Solar Irradiation for the location where the system will be installed. This can be done by consulting the CRESESB website, which provides this value of the sun's energy potential. We have several videos on the channel that teach this; I'll skip this part to save time, but to find out, just go to the channel's videos and search "How to calculate the sun's power" and you will find the video showing the step-by-step process. Agreed?
So, let's use the value of Imd = 5.32 kWh/m²*day (Ribeirão Preto - SP)
4th STEP to calculate how many SOLAR PANELS I need to install - System efficiency
We know that there are losses in our solar energy system, such as losses in cabling, shading, temperature, tilt, orientation…
Let's use an efficiency of 75%.
Now that we have all the data we need, let's use the formula and calculate the power of the solar energy system we need.
5th STEP to calculate how many SOLAR PANELS I need to install - Calculate the power of the solar energy system.
With the values defined, let's do the calculations:
Power = 11.3 / (5.32 * 0.75) = 2830 Wp = 2.83 kWp
Now that we know the power, let's calculate the number of panels.
Step 6 to Calculate How Many Solar Panels I Need to Install - Determining the Number of Panels
For this example, we'll use 405W photovoltaic modules (solar panels). You can use any power you want. What matters here is the final power of your system. I'll explain this part better after the calculations.
Therefore, simply divide the system power by the solar panel power:
Number of panels = 2830 / 405 = 7 solar panels
So, to generate around 344 kWh per month in the city of Ribeirão Preto - SP, we will need 7 panels of 405W.
I need to have 2830W or 2.83 kW of power. It doesn't matter now if I use 7 panels of 405W or just 1 panel of 2830W if it existed. What matters is that the sum of the final power of my system is 2830W, got it?
Now let's calculate this number using the spreadsheet so you can see how you can do these calculations in seconds.