What Is Solar Energy?
Solar energy works by converting the sun's heat or light into electricity. This mirrors natural processes, as plants run on solar energy when they photosynthesise. Solar panels are the primary technology enabling this conversion.
Three Main Solar Panel Types
- Photovoltaic Solar Panels — Convert sunlight directly to electricity via the photovoltaic effect and solar cells. Can also heat water cylinders. Most popular choice due to extended lifespan and functionality without direct sunlight.
- Thermodynamic Solar Panels — Produce hot water by circulating refrigerant at -22°C through panels that absorb atmospheric heat and infrared radiation.
- Solar Thermal Panels — Directly absorb solar heat, leveraging dark surfaces' heat-attracting properties.
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How Efficient Is Solar Energy in Ireland?
Panel Efficiency Rates
Solar panels typically convert between 15% to 22% of solar energy into electricity that households can utilise. Despite moderate efficiency percentages, adequate panel capacity compensates for this limitation.
Performance During Cloudy or Rainy Conditions
Cloud cover does not halt solar functionality. During the day, no matter how many clouds are around, there is still sunlight available for conversion, albeit in reduced quantities. This primarily affects efficiency rather than operation.
Nighttime Limitations
Solar panels cease functioning after dark since there is no sunlight available. Battery storage systems can address this constraint by storing daytime-generated energy.
What Are the Pros and Cons of Solar Energy?
Advantages
- Renewable Energy Source — Unlike fossil fuels, solar energy will not run out. It reduces Ireland's dependence on natural gas and minimises climate impact.
- Low Operating Costs — Solar systems have lower operating costs compared to alternatives. Minimal ongoing maintenance and lifespans between 25–40 years enhance cost-effectiveness.
- Greater Energy Independence — Installations reduce grid reliance and improve the security and reliability of your energy supply, especially combined with battery storage.
- Environmental Benefits — As a renewable source generating no harmful emissions, solar helps households reduce their carbon footprint.
- Government Grants — The SEAI provides grants covering solar installation, EV charging, and efficiency improvements.
Disadvantages
- High Initial Investment — Installation costs range between €5,000–€16,000, while SEAI grants cap around €1,800.
- Weather Dependency — Ireland experiences fewer annual sunlight hours than some regions, reducing panel efficiency.
- Maintenance Requirements — Systems occasionally require upkeep including panel cleaning, wiring inspection, and component replacement.
- Extended Payback Timeline — Initial investments take between three to four years for recoupment through energy bill savings.
- Inconsistent Energy Source — Solar generation lacks the stability of grid electricity, necessitating grid backup arrangements.
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How Good Is Solar Energy for the Environment?
Solar energy ranks among the greenest solutions available. It produces no emissions and avoids massive environmental disruption typical of wind installations. Since panels attach to existing structures, they enable decentralised "smart grids" rather than traditional centralised systems.
Ecological Concerns
Manufacturing solar panels requires materials necessitating mining and energy-intensive processing. Carbon intensity comparison per kWh:
| Energy Source | CO2 (gCO2e/kWh) |
|---|---|
| Hydro | 4 |
| Tidal | 8 |
| Wind | 12 |
| Nuclear | 16 |
| Biomass | 18 |
| Geothermal | 45 |
| Solar (PV) | 48 |
| Natural Gas | 469 |
| Oil | 840 |
| Coal | 1,001 |
Carbon Intensity of Electricity Generation
Source: IPCC
How Can I Find a Solar Energy Installer Near Me?
| Company | PV | Thermodynamic | Thermal |
|---|---|---|---|
| Electric Ireland | Yes | No | No |
| Solartricity | Yes | No | No |
| Solar Electric | Yes | No | No |
| Alternative Energy Ireland | Yes | No | Yes |
| NRG Panel | Yes | Yes | No |
| Green House Renewable Energy | Yes | No | Yes |
| LVP Renewables | Yes | Yes | No |
| Thermasol | Yes | Yes | No |
| PureVolt Solar | Yes | No | No |
The SEAI maintains a registry of qualified installers. SEAI grant eligibility requires using registered contractors. Grants are typically processed four to six weeks after installation.
You can also invest in getting a DIY solar panel kit if you prefer a more hands-on approach.