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How many solar panels do you need to generate 1 kW, 3 kW, 6 kW or 10 kW

In this article we will analyze how many solar panels you need to generate 1 kW, 3 kW, 6 kW or 10 kW, these are very frequent doubts in people who want to buy solar panels.

How many solar panels do you need to generate 1 kW, 3 kW, 6 kW or 10 kW

Year after year, interest in photovoltaics grows and with it electricity prices. Many customers have a dilemma:  adapt to rising electricity prices or produce their own energy and take care of the environment  ? Many of them wonder how many kW their own photovoltaic systems will produce and if it is worth investing in alternative energy sources. The prospect of lower energy costs is tempting.

  • Is it profitable to invest in green energy?
  • How much electricity does a solar panel produce?
  • How many solar panels do you need for a 100 m2 house?

These are just some of the questions that customers often ask.

Why is it worth investing in solar panels? 

The own photovoltaic means an easier and more ecological obtaining of energy from a natural and inexhaustible source. A carefully selected photovoltaic installation allows you to significantly reduce monthly electricity bills. It allows you to get the amount of energy necessary for the needs of a home, agriculture, business or your own solar park at a given time.

On the other hand, the surplus energy generated can be stored, sold and received from the Distribution Network Operator as a prosumer after the contract is signed.

It is important that in the weaker heating months, for example during winter, they can be recovered according to the “Discount System” according to the Renewable Energy Sources Act of July 1, 2016. 

How does the conversion of solar energy into electricity work?

How many solar panels do you need to generate 1 kW, 3 kW, 6 kW or 10 kW

How does the conversion of solar energy into electricity work? The inverter in the photovoltaic system converts direct current into alternating current, which is later found in the sockets. The Distribution System Operator must replace the meter with a bidirectional one, which will allow the energy consumed from the network to be measured and that which can later be recovered from the network according to the balance system. Said meter counts the energy that was obtained, for example, for the needs of a building and that is directed to the electrical network. The balancing system allows the use of excess energy in certain values. By installing up to 10kW, you can recover up to 80% of the surplus energy!

Wondering  how much a solar farm of more than 10 kW will produce  ? If you have an installation with an energy consumption between 10kW and 50 kW, you can recover up to 70% of the surplus! 

Investing in photovoltaic panels is the most popular way to produce your own electricity in an environmentally friendly way. The main benefit is the low and fixed electricity rates, regardless of any increase in energy prices. For many clients, the motivation is precisely this independence, obtaining energy from the sun and caring for the natural environment. Therefore, investing in photovoltaic panels is beneficial and profitable from the economic point of view for both households and for companies and individual customers.

Own photovoltaic panels and cells: what should you know before buying? 

Solar panels are also known as solar modules.

They consist of photovoltaic cells that extract energy from the sun and special wiring, for example solar cables that are adapted to generate the highest DC voltage and so-called connectors of various standards, which also determine the safety of the installation. On the other hand, an inverter, which is also often referred to as an inverter, converts direct current to alternating current. 

Assuming the customer buys correctly selected photovoltaic panels tailored to individual heating needs, he can save  up to several thousand zlotys per year  on electricity!

Considering the type of panels, their respective parameters and the 5% annual inflation of electricity prices, such savings are possible. It is a simple way to become independent from an energy company, to obtain your own energy in accordance with the care of the natural environment. The exact amount of savings can be calculated using the  calculator  available on the website. 

Example:  if a customer wants to use 5 solar modules with a value of 370, he will get approximately 1.85 kW of energy. Therefore, the savings calculator on our website will show an individual valuation of PV energy, since the minimum energy value to calculate with the calculator is 2kW. 

Which panels to choose and which ones are worth investing in? 

There are many different types of photovoltaic panels from Polish and world producers on the market. At N Energia, you can order the installation of a photovoltaic installation with proven and safe panels from well-known manufacturers:  Selfa  and   Risen Energy  . 

  • The  photovoltaic panels  Selfa  are panels manufactured in Poland and are better suited to the climatic conditions of the country, which also affects efficiency. They are characterized by a special self-cleaning surface and high resistance to external factors. They are famous for their solidity. The manufacturer’s warranty for Selfa panels is 30 years. Our offer includes Selfa 360 monocrystalline cells (176 cm x 100 cm), which look very aesthetic when placed on black ceilings. The customer can also choose the Selfa 370 monocrystalline cells, which are characterized by black frames and also have a very aesthetic appearance. 
  • On the other hand, the photovoltaic panels of  Risen Energy They are modules manufactured by a German company, for which the customer receives a 12-year manufacturer’s warranty. They differ from Selfa modules mainly in terms of aesthetics. Raised panels have the lowest power factor in the industry and high efficiency while maintaining low radiation intensity. Risen models are available in several different versions and sizes to choose from: 335 and 340 tub wattage ratings with 180cm x 100cm dimensions are available in black and silver frames, and 345 and 380 tub wattage Risen panels in frames. black, and its dimensions are: 180 x 100 cm and 185 x 100 cm. There are also Risen modules with a power of 415 tub, the surface of which is slightly larger than the others, and the dimensions are 200 × 100 cm. 

How many solar panels should you choose and what does it depend on?

How many solar panels do you need for a 100 m2 house?

It is estimated that a household, that is, a family with two children, consumes between 4,000 and 6,000 kWh per year. For a farm of this type, an installation that generates electricity with a maximum power of 4 to 6 kW is sufficient. 

Each building has different energy needs that must be calculated also taking into account, among other things, the power of the solar panels. Choosing the right installation for your home depends, among other things, on:

  • annual domestic electricity demand,
  • the shape of the roof,
  • its surface,
  • as well as the angle of the roof slope,
  • exposure of the panels to sunlight and their nominal power.

It is on the basis of these values ​​that the energy demand of the home can be calculated. 

When calculating, you need to take into account the number of household appliances that run on electricity, the needs of loved ones and last year’s electricity bills, as well as the dimensions of the photovoltaic panels and their nominal power, which is located in the part rear of each panel. . Future investments are also important, for example, the installation of a heat pump in the home, the replacement of equipment with more energy efficient ones or other investments that require additional energy expenditure. 

How much electricity does a solar panel produce?

How to calculate how much electricity a solar panel produces? The average price of electricity with distribution services is approximately PLN 0.617 per 1 kWh of energy consumed. However, the calculation of the cost of electricity depends on many other factors, including current prices in exchange, demand, tax rates, tariff rates to which the farm is subject, requirements of national and international institutions, weather conditions. 

The electricity consumption generated by a photovoltaic installation is measured   in kilowatt hours (kWh)  , which is the unit that checks the installation’s consumption for every 1,000 watts of power. The sum of the kilowatt hours consumed allows you to calculate the electricity consumption of your home. This billing system is used mainly in households, since the average monthly electricity consumption ranges from several to several thousand kWh. In the case of photovoltaics, much larger power units are used for business use. 

  • How many solar panels do you need for 3 kW? It is estimated that for 1 kW approximately 3 photovoltaic panels are needed, and the necessary area on the roof for such an investment is approximately 4.5 m2. However, to obtain 3 kW, about 9 photovoltaic panels and an area of ​​about 17m² are needed.
  • How many solar panels do you need for 4kw? In a situation of such energy demand, 12 photovoltaic panels are enough. 
  • How many solar panels do you need for 6 kw? If the customer wants to get this amount of power, they will need to install 18 panels on the ceiling or on the floor.
  • However, for a value of  10 kW  , up to 30 panels are needed.

What is the power of solar panels and what does it depend on?  

Many people wonder  how much energy a photovoltaic panel will produce  .

The power of photovoltaic panels depends mainly on:

  • current weather conditions,
  • the exact dimensions of the panels,
  • the arrangement of the modules in relation to each other,
  • intensity of solar radiation,
  • the angle of inclination of the roof,
  • the degree of shading of the modules,
  • adequate exposure of the installation to solar radiation,
  • installation technology and amount of energy consumed. 

The efficiency of a photovoltaic panel, that is, the amount of electricity that a panel can produce under standard conditions (the so-called maximum panel power), is called the unit kilowatt-pic – kWp. 

Example:  If a solar panel with a capacity of 335 W draws power for one hour, the customer’s performance will be approximately 335 Wh of energy. The annual electricity requirement for a family of 4 is 4,500 kWh. To calculate how many panels will be needed for your farm’s energy needs, simply divide this value by the annual yield. In this case, it is 14 photovoltaic panels that meet the energy needs of a family of 4. 

In scientific studies, the efficiency of solar panels is tested under laboratory conditions. Most of the time it is assumed that the instantaneous power of solar radiation is approximately 1000 W per m². On the other hand, the air temperature does not exceed 25 ° C, and the wind speed is not more than 1 m / s and these are the so-called standard measurement conditions for this type of inversion. That is why the most popular photovoltaic panels with silicon cells work best at an optimal temperature of 25 ° C. When choosing panels, pay special attention to their type, dimensions and power ratings. The power rating of the panels is shown on the back of each panel. 

The highest energy growth is generated by photovoltaic panels in May, and the lowest in the winter season from December to February, so their energy efficiency is variable and depends on temperature, sunlight, shade, and wind speed. and the rated power.

It is worth knowing that if, for example, there is a lack of space on the roof, you can consider installing photovoltaic energy on the ground on the plot or patio. The advantage is that there are no space restrictions. The exception is when we have a small parcel of land or a carefully separated space for the needs of such investment. The second aspect in favor of photovoltaic power mounting on the ground is that it is easier to place the panels at the correct angle than on the roof. A well-chosen power of the panels and a carefully designed installation guarantee safety.

Does the  photovoltaic cell produce energy? 

 

Photovoltaic panels are usually made up of silicon photovoltaic cells (polycrystalline or monocrystalline). To generate power, they are usually connected by special wiring and then connected to collect solar energy modules. The photovoltaic installation must be safe, and this is facilitated by carefully designed solar cables that carry the highest power voltage and provide protection against the threat.

Before buying a photovoltaic installation, it is also worth considering a fire protection system with a special disconnector that allows the voltage of the modules to be earthed with a special extinguishing foam and minimizes the risk of fire. 

Example: If you  choose a 6 kW installation and invest in it between PLN 20 and PLN 30,000, the customer can also choose a fire protection system for approximately PLN 1,500. Customers who choose such protection have a special label on the box, which informs others about the existence of a photovoltaic installation with a fire protection system. 

The effectiveness of the panels depends on the weather conditions, and they are variable and depend on the seasons, but also on the way they are arranged. The panels are installed in series. If one of them is shaded, for example, by 30% compared to the rest, then the entire series of panels is 30% less efficient. However, to increase the energy efficiency of the panels, optimizers are installed. Its installation makes each module work individually, achieving maximum efficiency. Optimizers are worth using when, for example, some panels are shaded by a tree during the day. 

When choosing a SolarEdge inverter, which costs from a dozen to several dozen thousand zlotys, you can install more than two rows of panels, but under each of them there should be optimizers, which cost about PLN 200 per piece. 

Example:  Two 5kW photovoltaic installations can differ in the installation price by up to 20-30% because they are equipped with two completely different inventories. 

Most photovoltaic companies verify where on the plot or roof the highest yields can be obtained under standard measurement conditions, so that the installation generates the best yields. To do this, it determines the most favorable climatic conditions for the production of electricity and the optimal air temperature, which is 25 ° C. For this reason, it is so important to choose a properly selected place for the facilities on the plot, individual consultation with the company, as well as determining the most suitable angle of inclination of the panels in relation to sun exposure. 

How to calculate how much current the panel produces?

The average insolation in Poland is approximately 1600 hours per year. It is worth remembering the   difference between the intensity of solar radiation and sunlight  .

  1. The first factor is the   power of solar radiation  , which covers one square meter in one second of radiation. The intensity of the radiation is calculated using the number of watts per square meter. 
  2. On the contrary,  insolation  is the number of hours that is related to the action of sunlight that falls on the surface of the Earth.

Taking into account a solidly constructed photovoltaic installation and sufficient exposure of the panels to solar radiation, 1kWp of photovoltaic panels can be used to obtain 900-1000 kWh of electricity per year. If the installation consists, for example, of 15 monocrystalline panels of 300 Wp each, the amount of renewable energy obtained will be approximately 4,275 kWh. 

Is the solar farm itself profitable? 

The return on investment mainly translates into lower and constant loads on the power grid. For the purchase of photovoltaic from 2kW, you can obtain special financing from other programs such as  My Electricity or Clean Air  , which effectively reduce investment costs.

To receive financing, it is enough to meet several conditions: start the installation of the installation and finish it in 3 years, and buy products that can be deducted from your income and show them in the annual statement of the PIT.

The payback time of the installation depends mainly on the power and efficiency of the panels adapted to the needs of the building, but the return on investment in itself takes several years.