A solar panel is a device that converts sunlight into electrical energy. This process occurs through the photovoltaic effect, where light generates an electric current. A solar panel is made up of multiple solar cells, typically composed of a semiconductor material like silicon. When sunlight hits a solar cell, it causes electrons to move, creating an electric current. Connecting the cells in series or parallel allows for the production of greater electrical power.

When sunlight hits a solar cell, it sets electrons in motion, creating an electric current. This current is conducted from the solar panel to a connected device or the electrical grid through special wiring. To use the electricity for household appliances, for example, the current is converted from direct current (DC) to alternating current (AC) using an inverter, as most household devices operate on AC.

The use of solar panels is an environmentally friendly and sustainable way to produce energy, as it does not generate carbon dioxide emissions and does not require the use of natural resources for energy production, unlike fossil fuels. Solar energy is a renewable resource that is available in unlimited supply. Additionally, solar panels can help you reduce your electricity bill by enabling you to become partially self-sufficient in energy production.

The amount of electricity produced by a solar panel depends on several factors, such as the panel's efficiency, size, the amount of sunlight it receives, and the angle at which it is installed. Typically, the output of a panel is measured in watts (W) or kilowatts (kW), indicating how much electricity the panel can generate under ideal conditions.

For example, a single solar panel with a surface area of one square meter might have a power output of approximately 150-200 watts. From this, it can be estimated that under good conditions, the panel could produce around 1-1.5 kWh of energy per day (assuming about 6-10 hours of sunlight per day). However, it's important to note that actual production can vary significantly based on weather conditions, the time of day, and the season.

It's crucial to remember that these figures are only indicative, and the actual electricity production will depend on local conditions and the installation of the panel. For the most accurate information about the output of a solar panel system suited to your needs, it's best to consult with one of our professionals, who can consider all the necessary factors.

The payback period for solar panels is currently 6-8.5 years, but at best, they can even pay for themselves.

Yes, under current (2023) energy prices, solar panels can potentially outperform stock market indices on average, provided that the following factors are taken into account: the panels are not heavily shaded, the roof orientation is not facing north, there are no plans for a roof renovation in the next 15-20 years, and the buyer's financial situation allows for the investment.

Solar power systems, including solar panels, are highly durable and can withstand even the harsh weather conditions in Finland. Their lifespan is estimated to be 30-50 years, during which time they can repay their value many times over. However, it's crucial that the installation is done correctly, with proper wiring, and that the setup prevents excessive snow loads from accumulating on the panels.

There's no need to worry about maintaining solar panels, as it's better not to touch them to avoid scratching their surface, for example, with a snow shovel. In Finland, it rains frequently enough to keep the panels clean naturally. Solar power systems generally require little maintenance, although some experts suggest that the inverter may need replacing every 15 years or so. This is a quick procedure, and by that time, the system has usually already paid for itself.

Solar panels are a good investment especially for single-family homes. If the roof slopes face south, east, or west, the payback period for a solar power system under current (2023) energy prices could be 6-8 years, which equates to an 8-12% annual return on investment as direct savings. However, it's important to consider the household's energy consumption and ensure the system is adequately sized to optimize the best return on capital.

The efficiency of solar panels decreases by about 0.5% annually. However, panel manufacturers typically offer a 25-year performance guarantee, ensuring that the panels will still produce over 80% of their maximum output even after 25 years. While the panel efficiency declines by 0.5% per year, the average increase in electricity prices of 2% annually (according to Statistics Finland) helps to offset this loss in the long run.

The estimated lifespan of a solar power system is about 30 years, so it's not advisable to invest in one if your home's lifespan is significantly shorter, if a roof renovation is planned, if the panels would face north or near-north, or if there are large trees on the property that would shade the roof (though this isn't always the case—we can calculate and assess the actual shading throughout the year!). A solar power system is also a significant investment, typically ranging from €6,000 to €12,000, and it should only be undertaken if your financial situation allows. In the long run, and in the right conditions, a solar power system can be an excellent investment.