# How many panels do I have to put on my roof?

If you are thinking of installing solar panels on your roof, one of the questions that surrounds your head is How many solar panels do I need for my house?

How much power does the installation need to really fulfill its functions, that is, to reduce the bills to almost zero? These questions are asked quite often, so in the next article we will tell you how to choose the correct power and, accordingly, the number of photovoltaic panels. Feel free to read the article.

## How many panels do I have to put on my roof?

What does it depend on if we install 10 solar modules on one roof and 100 solar modules on another? The answer is simple: starting from the energy demand of the home, but how do we know what the demand is? Well, this information can be found on the electricity bill in the form of ANNUAL consumption.

You can also call your energy dealer to find out what your usage was the previous year. It is important to consider when planning a photovoltaic installation if its demand will increase next year, for example, by installing air conditioning. Which, of course, happens quite frequently at current temperatures during the summer.

Assuming that our demand in the next few years will be at the same level as today, it is not worth installing much more energy than we really need. What is the optimal number of solar panels for my needs  ?

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To show you how to calculate the required number of PV modules, we will use an example.

## I calculate the solar panels I need for my house

Suppose our  annual consumption is 4,650 kWh.

4650 kWh / 1000h = 4,6 kW

Remember  that sending the energy distributor to recover its 80%. In practice, this means that we should install panels with a power of 20% more than what results from consumption  .

4.65 kW * 1.2 =  5.58 kW

Great  part  310 kWp  .310 kWp / 1000 = 0,31 kWp

However, please  note  In fact, these conditions are very rare, which means that the actual power of the module will be less.

5.58kW  / 0.31 kWp =  18  – number of modules needed to satisfy the energy needs of our home.

However, it is worth consulting with an advisor who will select the optimal number of panels based on visual inspection of your home, installation options, solar potential, and energy consumption.

Make an appointment for a free meeting with an Edison Energia representative and learn about the benefits of your own photovoltaic installation.

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