How Do Solar Panels Work? Tips for Homeowners – Redfin Blog

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Solar panels convert energy from the sun into usable electricity. Many governments also offer subsidies and tax breaks for people to install them on their properties, making them a popular choice for homeowners nationwide. 
To get the most out of a solar panel system, it’s important for homeowners to understand how they work. So how do solar panels work? Whether you live in a rental in Boston, or a house in New Haven, CT, read on to learn about how solar panels work, different types of solar panels, and how to know if your solar panels need maintenance.gorgeous Solar panels use photovoltaic (PV) technology to convert sunlight into energy. PV panels absorb sunlight using semiconductor materials — typically with silicon and a mix of phosphorus and boron. When photons (light) from the sun hit the silicon panel, they knock electrons loose from their atoms, creating an electrical current that flows through metal contacts in the panel. Solar inverters convert this energy from direct current (DC) to usable alternating current (AC) electricity.
A solar panel usually consists of between 36 and 144 PV cells, each producing about one or two watts of power. Most residential solar panels have 60-72 cells. These cells are strung together into panels. A residential solar system can rely on a single panel or multiple connected panels (an array.) Typically, homeowners connect one or more arrays to the electrical grid to power their house. 
While solar panels are generally efficient, “it can vary depending on how much sunlight there is, the make and model of the solar panels, and which way they’re facing,” notes the team at Wunder-Mold.
Around 84% of solar panels in the US are made from crystalline silicon. However, other types of solar panels use alternative materials and new technologies. Here are the three most common:
There are three common technologies we use to harness solar energy: photovoltaics (PV), concentrating solar power (CSP), and solar heating and cooling (SHC) systems. PV panels are the most common for homeowners. how-do-solar-panels-work-3 Solar energy production doesn’t end with solar panels. The process involves integration and transmission across the country. There are three important steps: generation, conversion, and distribution. Energy storage is also essential to provide renewable electricity during periods of high use or bad weather. 
Large-scale solar farms or other solar production systems often produce electricity for public use.
Solar panels can still generate power during cloudy days. Because panels react to the visible light spectrum, they will work if there is enough light to see. Additionally, periodic rain can actually be beneficial for solar panels, as it cleans off dirt and debris that can lower their efficiency. 
“If you have a new home, get the most out of your panels – even on cloudy days – by having a large, south-facing roof with a slope of between twenty and forty degrees,” says Ryan Poppe from Colorado Property Group.how-do-solar-panels-work-2 Most solar panels last for 25-30 years. Solar panels don’t necessarily die after that period, but their efficiency often drops below their manufactured standards. 
To keep your solar panels working better for longer, clean them regularly and have them serviced by a qualified professional.
Broken or faulty panels reduce your system’s output, costing you money. Here are nine ways to tell if your solar panel is broken:
If you notice any of these signs, call a qualified solar professional. Don’t attempt to repair your panels on your own. It could lead to electrical shock or other injuries. 
Cleaning your solar panels is essential to keep them working optimally. Dust and debris can block sunlight from reaching certain parts of a panel, which reduces its efficiency. Bird droppings, dust, and leaves are the most common types of debris that interfere with a panel’s performance. 
To clean your solar panels, use a scrub brush to apply mild soapy water across the surface, moving from one panel to the next until they are free from clutter and debris. Never use a strong chemical product, even for tough stains, as they can leave a mark or streak on your panels, permanently damaging them. 
Homeowners in dusty desert climates, including popular migration hotspots like Las Vegas and Phoenix, should clean their solar panels every six months. Additionally, if you have solar panels on a flat roof, watch for pooling water after a rainstorm.
Cleaning solar panels can be extremely dangerous. Take maximum precaution and hire qualified professionals if you are unsure or unfamiliar with the process.how-do-solar-panels-work-4 Solar panels save you money over time. The standard amount of time it takes for solar panels to pay for themselves is between six and ten years, although this varies widely. While solar installation can be expensive (up to $40,000 for large projects), utility savings, tax breaks, and government subsidies help offset the cost. 
Keep your solar panels in top condition and choose the correct number of solar panels for your home to get the biggest savings. 
Redfin does not provide financial or environmental advice. Individual energy needs, use, and capabilities may vary. Always consult a professional and take your individual circumstances into account before installing solar panels.
Jamie is part of the content marketing team and enjoys writing about home trends, finance, and climate. His dream home is a small, modern, and minimalist forested home where he can hear the wind blowing at night.
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