Photovoltaics is the technology branch that directly converts sunlight into usable electrical energy. Known as PV for short, photovoltaics offer a clean and sustainable alternative to fossil fuels, addressing the urgent need to reduce greenhouse gas emissions and combat climate change.
Below, we explain how PV technology works, how much it costs and how it can lead to not only a greener planet, but more green in your wallet.
Photovoltaic systems use solar cells made of semiconducting materials to capture and convert sunlight into electric current, which can be used for various applications.
Jump to insightPhotovoltaic technology comes in a variety of forms.
Jump to insightThe cost of PV systems can be influenced by factors such as technology, installation complexity and local market conditions, but they can offer long-term cost savings and energy independence.
Jump to insightWhat is photovoltaic technology?
Photovoltaic technology lets you generate electricity from a renewable source: the sun. Unlike traditional methods of electricity generation, which often rely on fossil fuels, photovoltaics create electricity without causing pollution or using up limited resources.
Originating from the discovery of the photovoltaic effect in 1839, PV evolved to play a vital role in our renewable energy landscape, providing clean and affordable solar power generation.
Photovoltaic systems are used in many different ways. They can be installed on rooftops, where they capture sunlight and convert it into electricity for domestic or business needs. They can also be set up in large solar power plants, where they generate electricity on a larger scale, contributing to the overall energy supply.
How does PV technology work?
PV technology is based on the principle of the photovoltaic effect, which involves the conversion of light energy into electrical energy.
The photovoltaic effect
At the heart of PV technology lies the solar cell. Solar cells are constructed using semiconducting materials, typically silicon, that transform sunlight directly into electricity.
The photovoltaic effect starts when sunlight reaches the surface of a semiconductor. It releases its energy in the form of small particles called photons, which are absorbed by the semiconductor. Electrons within the semiconductor gain enough energy to break free from their atomic bonds, resulting in the creation of electron-hole pairs.
Inside a solar cell, the semiconductor material has a structure that works like a tiny power plant. When sunlight hits the cell, it creates a separation between negatively charged electrons and positively charged holes within the material. This separation sets up an electric field.
To collect the electrons and make them useful, metal contacts are placed on the surface of the semiconductor. These contacts gather the electrons and create a flow of electric current, which is used to create power.
» MORE: How do solar panels work?
How the devices in a photovoltaic system work
Solar panels are made up of multiple interconnected solar cells. When sunlight strikes the panels, the semiconducting material inside the cells absorbs the photons and generates an electric current. The panels are typically installed on rooftops or in open spaces to capture maximum sunlight.
Solar cells are made up of semiconducting materials that absorb photons from the sun to produce an electric current.
The electric current produced by the solar panels is in the form of direct current (DC) energy. Because most homes and businesses use alternating current (AC) for their electrical devices, the inverter converts the DC electricity from the panels into AC electricity, making it compatible with standard electrical appliances and the power grid.
» LEARN: Solar inverters: types, benefits and cost
In some PV systems, batteries are used for energy storage. Excess electricity generated by the solar panels during the day can be stored in batteries for use when the sun isn’t shining at night or during cloudy periods. These batteries store the energy as DC power and can provide backup electricity when needed, reducing dependence on the grid.
» COMPARE: Best solar batteries
You can also use a metering system to monitor the energy production and consumption of a PV system. It tracks how much electricity the system generates from the solar panels and how much is consumed by the electrical devices in the building. This information helps to understand your energy usage, assess the performance of the PV system and potentially feed surplus electricity back into the grid for credit or compensation.
Efficiency and performance factors
The efficiency of PV technology is measured by how effectively solar cells convert sunlight into electricity. Factors influencing performance include the quality of materials, design of the solar cell and external conditions such as sunlight intensity and temperature.
» COMPARE: Most efficient solar panels
Types of photovoltaic technologies
Photovoltaic technology comes in a few different forms, including silicon-based, thin-film, concentrated, multijunction and organic/dye-sensitized solar cells.
Silicon-based photovoltaics
Traditional silicon-based photovoltaics are the most commonly used type of solar technology. They offer high efficiency and durability, making them suitable for various residential and commercial rooftop installations as well as large-scale solar farms.
Thin-film photovoltaics
Thin-film photovoltaics use a thin semiconductor layer to convert sunlight into electricity. This type of technology is flexible and lightweight, allowing for versatile applications such as integration into building materials, portable solar panels and even wearable electronics.
Concentrated photovoltaics (CPV)
Concentrated photovoltaics employ lenses or mirrors to concentrate sunlight onto small, high-efficiency solar cells. CPV systems are particularly useful in areas with high direct sunlight, such as desert regions. They’re commonly used in utility-scale solar power plants and can achieve very high energy conversion efficiencies.
Multijunction photovoltaics
Multijunction photovoltaics use multiple layers of semiconductors to capture a broader spectrum of sunlight and increase overall efficiency. These solar cells are commonly used in space applications, such as satellites, where high efficiency and compactness are crucial.
Organic and dye-sensitized solar cells
Organic photovoltaics (OPV) and dye-sensitized solar cells (DSSC) are emerging technologies. OPV utilizes organic materials and can be produced using low-cost printing, making them suitable for flexible applications. DSSC uses dyes to absorb sunlight and is often employed in consumer electronics and building-integrated photovoltaics.
Cost of solar photovoltaics
Solar photovoltaic (PV) systems can offer significant long-term cost savings and a range of other benefits. However, before making a purchase, it’s crucial to thoroughly evaluate the financial aspects involved.
Components
To get your PV system up and running, you'll need to invest in solar panels, inverters, mounting structures and the labor to install them. The upfront costs can vary based on the size of your system, the technology you choose, and how complex the installation is.
Maintenance and operation
Maintaining and operating your PV system isn’t very expensive. It’s generally low-maintenance, mostly requiring occasional cleaning and inspections. Operation costs involve performance monitoring and addressing any minor issues that pop up.
Technology and efficiency
Different PV technologies and higher-efficiency modules vary in cost.
Installation complexity
Factors including roof type, accessibility and electrical system upgrades can affect installation costs.
Local market and labor rates
Regional variations in material costs and labor rates can impact overall system costs.
» MORE: How much do solar panels cost?
Economic considerations for solar PVs
Homeowners who install solar photovoltaic systems may be eligible for a tax credit or other state or local incentive, and can even see their property values rise.
Incentives, grants and subsidies for solar energy adoption
To encourage solar energy adoption, governments, utilities and organizations offer various incentives. These include tax credits, rebates, grants and net metering programs, which can help offset initial investment costs and accelerate the return on your investment.
» MORE: How does the federal solar tax credit work?
Don't stress about paying for everything upfront. There are different financing options to consider, such as buying with cash, getting a loan, leasing or opting for a power purchase agreement (PPA). Plus, don't forget about any tax credits or other incentives your state or local government may offer — they knock down the overall cost and make solar more accessible.
» LEARN: How do solar loans work?
With net metering, when a solar energy system produces more energy than is consumed, the surplus is fed back into the grid and, in return, the energy provider credits the owner's account. This enables solar power system owners to offset their electricity bills and even receive compensation for the energy they contribute to the grid.
Economic benefits of solar photovoltaics
Investing in solar PV systems can provide several economic benefits, including the following:
Energy savings
Using solar energy reduces reliance on grid electricity, resulting in lower utility bills and long-term energy savings.
Return on Investment (ROI)
The time it takes to recover the initial investment in a solar PV system, known as the payback period, depends on various factors, including system cost, energy consumption and available incentives.
According to the National Renewable Energy Laboratory, rooftop solar panels typically pay back their energy production within one to four years and can last for about 30 years. Afterward, the solar PV system generates free electricity, contributing to even greater savings.
Increased property value
Installing a PV system can increase the value of your property. Potential buyers are often attracted to homes equipped with solar technology due to the long-term savings they offer and their positive environmental impact.
Pros and cons of photovoltaic systems
PV systems are a clean and energy-efficient way to power your home. But as with other major home projects, you should weigh potential pros and cons to determine whether it’s the right addition for your home.
Pros
- Clean, sustainable energy source
- Lower utility bills
- Potential tax credits
Cons
- Upfront cost can be pricey
- May need professional installation
- Potentially reduced electricity output on cloudy day
FAQ
What is the life span of a photovoltaic system?
Photovoltaic systems typically have life spans of 20 to 30 years, according to the Department of Energy.
Can photovoltaic systems work on cloudy days or at night?
PV systems primarily rely on sunlight to generate electricity. While their efficiency may be reduced on cloudy days, they can still produce electricity.
However, PV systems do not generate electricity at night because they require sunlight to operate. To ensure a continuous energy supply, you can use energy storage solutions such as solar batteries to store excess electricity produced during sunny periods for use during cloudy days or at night.
How do I determine if my property is suitable for installing a PV system?
You need to consider several factors when assessing if your property is suitable for a PV system installation. These include the availability of unobstructed sunlight exposure, the orientation and angle of the roof, potential shading from surrounding objects such as trees or buildings and the structural integrity of the roof.
To get an accurate assessment, you should consult a qualified solar installer. They have the expertise to accurately evaluate your property's potential for a PV system and can provide guidance on the optimal design and placement.
Can I install a PV system myself, or do I need professional assistance?
While it is possible to install a small-scale PV system yourself, you generally should seek professional assistance for larger installations or if you lack experience in electrical work.
Installing a PV system involves various technical aspects, including electrical connection and compliance with local regulations and building codes. Professional installers possess the necessary expertise and experience to design and install systems safely and efficiently, maximizing performance and longevity. They can also handle any required permits or inspections, ensuring a smooth and compliant installation process.
Article sources
ConsumerAffairs writers primarily rely on government data, industry experts and original research from other reputable publications to inform their work. Specific sources for this article include:
- National Renewable Energy Laboratory, “PV FAQs.” Accessed Nov. 13, 2025.
- U.S. Department of Energy, “Optimizing Solar Photovoltaic Performance for Longevity.” Accessed Nov. 13, 2025.
