What Are the Different Types of Solar Panels?
Solar panels come in many different shapes and sizes with three main types popular in Ireland:
- Photovoltaic Solar Panels — Uses photovoltaic effect to convert sunlight into electricity, utilising infrared rays from the sun. Cost range: €4,000 to €8,000 in Ireland.
- Thermodynamic Solar Panels — Generates hot water rather than electricity. Uses extremely cold (-22°C) liquid refrigerant to absorb heat from air and infrared rays. Cost range: €3,500 to €5,500.
- Solar Thermal Solar Panels — Directly collects heat from the sun, similar to how a dark car interior heats up. Cost range: €2,500 to €4,500.
Photovoltaic panels are most popular in Ireland and eligible for SEAI grants.
What Materials Are Solar Panels Made From?
What Are Silicon Wafers?
The central material in solar cells is silicon, which converts sunlight to electricity through semiconductor properties.
Two types of silicon:
- Monocrystalline Silicon — Made from a single crystal of silicon. More efficient than polycrystalline. More expensive to produce. Usually black in colour.
- Polycrystalline Silicon — Made from multiple fragments of silicon. Slightly less efficient. More affordable to produce. Blue in colour due to crystal combination.
What Is Anti-Reflective Coating for?
An anti-reflective coating is added to stop sunlight from escaping and increase absorption by solar cells. It boosts the efficiency of the solar cells and typically uses silicon nitride, boron nitride, or titanium oxide.
What Are the Metal Conductors for?
Metal conductors allow electricity generated to be transported and redirected from panels. They connect solar cells so electricity can pass through. Usually made from either copper or aluminium.
What Is a Solar Encapsulant?
An encapsulant is extremely important for the overall functioning and durability of solar panels. Usually a special polymer made from ethylene vinyl acetate (EVA). It protects cells from dust, dampness, and harmful radiation while maintaining efficiency.
What About the Glass Casing?
Glass casing helps protect the entire solar panel and its internal cells. It regulates temperature preventing overheating and measures just over half a centimetre thick.
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What Are the Main Components of Solar Panels?
5 Main Solar Panel Components: Solar Cells, Inverter, Junction Box, Backsheets, Glass casing
What Part Do the Solar Cells Play?
The solar cells are the main component of any PV solar panel and allow for the sunlight to be directly converted into electricity through the photovoltaic effect. More solar cells generate more electricity.
What Is an Inverter?
The inverter is important for converting the direct current (DC) from sunlight into alternating current (AC) used in homes, powering appliances and lighting.
What Does the Junction Box Do?
The junction box is another essential part where panel wires connect to each other and carry generated electricity. Usually fitted at the back of the solar panel.
What Is a Backsheet?
The backsheet is the layer on the back of the solar panel providing barriers against moisture and environmental damage. It insulates solar cells so they don't get overheated.
What About Solar Panel Batteries?
Solar panel batteries store excess energy for later use. They're expensive additions but increase efficiency and provide backup power during grid outages.
What Are Solar Panel Batteries Made of?
- Lead Acid — Oldest battery type. Long-lasting, reliable, and recyclable. Tend to wear out sooner, requiring constant charging.
- Lithium-Ion — Latest type of battery. Used with EVs and hybrid cars. Requires minimal maintenance. Expensive with greater fire risk.
- Nickel Based — Very durable and survives high temperatures. Material they use is very toxic, making disposal difficult.
- Flow — Among most expensive due to size. Uses water-based electrolyte liquid. Long-lasting durability. Still need to become more popular for cost-effectiveness.
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Are Solar Panels Environmentally Friendly?
How Carbon Intensive Are Solar Panels?
Photovoltaic solar panels are the most carbon intensive of all renewable energy options. Carbon intensity comes from materials and manufacturing/export processes. However, at 48 gCO2e/kWh, they are considerably lower than fossil fuels like natural gas (469), oil (840), and coal (1001).
Carbon Intensity of Electricity Generation
Source: IPCC
What Ethical Concerns Are There for Solar Panels?
- Labour: Most production occurs globally with rising demand. There are concerns in some countries about the use of forced labour, which creates an ethical issue for how panels are made.
- Ecological Problems: Higher material demand leads to more land needing to be mined, with a negative impact on indigenous communities and wildlife.
- Recycling Issues: Solar panels are still not as recyclable as they should be. Low demand for reused materials since few have expired. This will improve later on as more panels need replacement.