
How do Solar Panels Work?
Is the Solar Panel System Automatic?
What are the Components of a Solar Panel Water Heating System?
What is the difference between Solar Flat Panels and Solar Evacuated Tubes (Vacuum Panels)?
Is the Irish climate suitable for Solar Panels?
What type of Solar Panels are better suited for the Irish climate: Solar Flat Panels or Solar Evacuated Tubes (Vacuum Panels)?
What happens when there is no Sunlight?
How do we Calculate how many Solar Panels are required?
What size Hot Water Cylinder Tank is needed?
How long does it take to install the Solar Heating Water System?
Where is the Best Place to Position Solar Panels?
What happens to the Solar Panel Water Heating System is there is Hard water (limescale)?
Are there any Grants available for Solar Panels?
What is the cost of installing Solar Panels?
What is the Return on Investment (ROI) on Solar Panels?
What are the Benefits of installing Solar Panels?
What Solar Products does Eirgreen use?
I want to install Solar Panels - What is the Next Step?

Although the sun is approximately 146 million kilometres (96 million miles) from earth, mankind has always been fascinated by this great star. It takes about 8.3 minutes for a ray of light from there to reach us (perhaps longer in
Over the years there have been a number of technology developments and methods to harness this energy from the sun and incorporate this into our daily lives such as motoring, generating electricity and to heat water in our homes.
Even on a cloudy day, the sun’s energy can be harnessed to heat water in your home, and better still it is for free. It is very similar to getting sunburnt on a cloudy day even though you can’t see the sun. The solar panel collectors on a roof work the same way and absorb the sun’s solar energy even when the sky is overcast and can then convert this to heating your water in the house. I am sure we have all seen solar panels on houses or perhaps thought they were unusual looking velux windows and wonder what they are all about but over the next number of years they will be essential for every house.
It makes clear economic sense to install a solar water heating systems in nearly every Irish home. From a cost point of view, the payback time for solar panels is around 5 years after generous government grants. Additional benefits are lowering CO2 emissions, saving on heating bills and participating in addressing global warming.

Solar heating works by capturing the suns heat through Solar Panels, either flat panels or evacuated tubes, and uses this free energy to heat up the water in your home.
In Ireland heating water is the second largest energy use in the average home and by using this clean renewable energy source, not only is it good for the environment by reducing our consumption of conventional fossil fuels, lowering our emissions of greenhouse gases but solar water heating saves you money and is fast becoming the number one alternative energy solution.
Installing a Solar Panel Water Heating System will provide you with between 60% and 70% of your annual hot water needs (less in winter, more in summer) and now with the current generous Grants offered by Sustainable Energy Ireland (SEI) through the “Greener Homes Scheme”, there has never been a better time to reduce your heating cost and your carbon footprint. Yes any efficient solar system is fully automatic and works in conjunction with your existing water heating system. You will always have hot water all year round, especially in the summer and in the winter time the solar panels will pre-heat the water so your existing system be it oil or gas only has to top up the water to the required temperature. The only difference is you will use less oil or gas and will never or very rarely use the emersion heater. What are the Components of a Solar Panel Water Heating System? • Solar Panel Collectors - to capture the solar energy. These can be Flat Plate or Evacuated Tubes • Circulation System – to move fluid between the Collectors and the Hot Water System • Control System – for regulation and to prevent overheating • New Hot Water Cylinder Tank – with factory fitted insulation for storing water and keeping it hot for longer What is the difference between Solar Flat Panels and Solar Evacuated Tubes (Vacuum Panels)? Is the Irish Climate suitable for Solar Panels? Despite popular belief that the Irish climate is not suitable for Solar Panel Energy due to our cloudy conditions and interrupted summers, the fact is that Even on a cloudy day, the sun’s energy can heat the water in an efficient system for free. Have you ever noticed that you can get sunburnt on a cloudy day even though you can’t see the sun? The solar panel collectors work the same way and absorb the sun’s solar energy even when the sky is overcast and can then convert this to heating your water in the house. Both systems over their life span (approx. 25 years) work quite efficiently and provide solar heating regardless of the climate. However, a Solar Evacuated Tube Collector is approx. 25% more efficient in cloudier conditions. Please note that from time to time, the tubes may blow, similar to a fluorescent light and to maintain their efficiency, the tube will have to be replaced, whereas the Solar Flat Panels are sealed and require no maintenance at all. What happens when there is no Sunlight? The solar panel works during the day, heating the water in your cylinder for use at night. It is a continued process, fully automatic and in At night, the solar panels will not heat your water but you will have sufficient hot water in your cylinder from solar energy produced that day. How do we Calculate how many Solar Panels are required? The solar panel system required and the amount of solar panels depends on the size of the house, number of occupants and the demand for hot water. The average person uses between 45 and 60 litres of hot water per day, therefore on average a 300 litre tank with 2-3 solar panels would be sufficient for up to 5 people. The General Rule of Thumb is approx 3-5 people, 2-3 Solar Panels and a 300 litre tank. What size Hot Water Cylinder Tank is needed? The size of the hot water cylinder fitted depends on your hot water demand and number of people in the house. The general rule is with 2 panels, usually a 200 litre tank, 3 panels or more usually a 300-500 litre tank. The larger the tank the more hot water the cylinder can hold. The water in the cylinder heated from the solar panels can remain hot for up to 3-4 days as all tanks are fitted with factory insulation and are highly insulated. eirgreen can advise on the best fit of your Hot Water Cylinder Tank whilst conducting a site survey. How long does it take to install the Solar Heating Water System? eirgreen use Sustainable Energy Ireland (SEI) registered installers to fit our Solar Panel Systems. Usually we require 1 full day to install a system with little or no interruption to your daily life. Where is the Solar Energy systems are placed in the optimum location. Usually facing South but can work quite efficiently in South Eastern or South Western positions. The collector area of the panels must not be obscured by trees or other buildings as this would jeopardize the efficiency of the system. The General Rule of Thumb is that an object would be at least 2.5 times the distance away from the Solar Panels for e.g.: if you had a wall and it was approx. 20 ft high, the solar panel should be located 50 ft away. What happens to the Solar Panel Water Heating System if there is Hard water (limescale)? Limescale does not affect the solar panels themselves, however hard water (lime-scale) does affect cylinders over time. Ideally if living in a hard water area, the installation of a Water Softener will look after not only your hot water cylinder but also your washing machine, dishwasher etc. eirgreen have a comprehensive Water Treatment section and can provide you with the best water softener to cater for your needs. Are there any Grants available for Solar Panels? Yes – there is a “Green Homes Scheme Phase III” grant available through Sustainable Energy Ireland (SEI). The maximum grant available is €1,800 for a Solar Panel Water Heating System and the amount of grant allowed is based on the amount of m2 of Solar Panels installed. The rate grant available for a Solar Flat Panel is €250/m2 and a Solar Evacuated Tubes is €300/m2. eirgreen can assist in completing the Grant Application Form for the installation of solar panels and will go through it with you step by step to ensure you understand the process. Once an application has been submitted, it takes a minimum of 21 days before Sustainable Energy Ireland (SEI) issue you with a letter of offer. Contact eirgreen today to learn more about the Grants available to you. What is the cost of installing Solar Panels? The average cost of an installed solar system is approx. €6,500. This varies from house to house and the demand for hot water. However, there are Grants available through Sustainable Energy Ireland (SEI) ranging from €1,200 through €1,800 to encourage the installation of this renewable energy. eirgreen offer information and assistance in completing the SEI Grant application forms. See our section on Grants. What is the Return on Investment (ROI) on Solar Panels? The average return on investment on solar panels is between 4-5 years. This is an estimation on current fuel costs however the real return on investment is you are cutting down on your CO2 emissions and your need for expensive fossil fuels. By installing a Solar Panel Water Heating System you are increasing the value of your property and will improve the new Building Energy Rating (BER) of your house. What are the Benefits of installing Solar Panels? • Reduce your heating costs. Use less oil, gas or electric for heating your house • Increase the value of your property and improve a Building Energy Rating (BER) • Free hot water • Reduce your CO2 emissions and your carbon footprint • Free energy from the sun • Do your part for climate change I want to install Solar Panels – What is the Next Step? Contact eirgreen at (057) 868 8877 or (085) 706 7879 or email eirgreen@gmail.com and we can arrange for a FREE Site Survey to determine the suitability of Solar Panels and explain the next steps, grant applications and procedure in getting Solar Panels installed and availing from free energy from the sun.
Solar Panels are fitted to ideally a south facing roof of your house, pointing towards the sun. The solar panels are made of specially designed material that absorbs the suns rays extremely efficiently and when the sun heats the solar panels, a fluid is pumped from the hot water cylinder in your hot press up and around the solar panels.
The fluid is then heated in the solar panels, returns to your hot water cylinder tank thus heating your water. A special type of hot water tank is always fitted with solar panels and can have 2-3 coils to tie in with your existing heating system.
Is the Solar Panel System automatic?
Solar Flat Panels look like a flat panel of glass similar to the velux windows that you see on roofs of houses. It is a flat plate absorber fixed in a frame between a single or double layer of glass with an insulation panel at the back. These are fixed through the roof onto the rafters and all pipe work is sealed and runs back into your hot water cylinder tank.
Solar Evacuated Tubes (Vacuum Panels) are a series of tube panels side by side made of 2 layers of glass. This allows the sun’s heat to be absorbed through the tubes of sealed glass efficiently but will not allow the heat to escape.
This system works similar to a thermos flask in the way that no heat is allowed to escape due to the vacuum.
What type of Solar Panels are better suited for the Irish climate: Solar Flat Panels or Solar Evacuated Tubes (Vacuum Panels)?
Please note: Under no circumstances should any work be undertaken before receiving a letter of offer from SEI.
What Solar Products does Eirgreen use?
Our Solar products are manufactured by trusted German manufacturers. They are:
• Consolar GmbH
• NEHS

Geo Thermal – Heat Pumps
For more information on geothermal heating systems contact eirgreen today.
Biomass is the fuel used to generate heat, electricity or for the manufacture of biofuel and is made from renewable energy sources such as farm waste, forestry waste, saw dusts and from crops especially grown for biomass production. Biomass fuel is cheaper than traditional fossil fuels and biomass crops can be re-grown again in a short period either annually or every couple of years. For home heating a wood pellet boiler or wood chip boiler is a popular choice and used compressed saw dust or wood chips. These Biomass Energy Systems can be self cleaning and the only by-product is ash which is reused again for the garden as a fertiliser. A gasification system is also available which can practically burn farm waste to heat the homes. These biomass heaters come in all sizes to fit the individual needs.
Contact eirgreen today to learn more about this clean affordable renewable energy source to heat your home.
Energy Tips – Electricity Saving
Being more energy efficient is not only good for the environment but it also saves you money in your pocket. We have all seen increases in our electricity bills and by following these electricity saving tips you can reduce your bills.
Energy Tips – Heating and Insulation
Heating your home is the most expensive bill for any householder and it is important that the heat you have in the home stays there to ensure a level of warmth and comfort for everyone. You are paying for heating your home and not the locality. The following tips will help you to save on your energy bills and save you money.
The combustion engine is a major contributor to our CO2 emissions and air pollution. We all need to get around and the burning of petrol and diesel in our cars, vans and trucks is all part of our daily lives. These fuels are costly and are not a renewable source and will eventually run out, but until the new technologies of hybrid vehicles, electric cars and bio fuel is widespread and affordable to everyone the following tips will make for proper eco-driving.
Energy Tips – Renewable Energy
Renewable Energy is the buzz word and people freely speak of it like its going out of fashion. Fossil fuels, oil and gas are not a renewable source so eventually this expensive precious source will run out. As regards to renewables these are replaced every year or couple of years as in solar energy is a constant free energy. The advantages of renewables are endless, not only on their cost but also on zero impact on the environment.
Over the next couple of years the sight of solar panels on roofs of house will be the norm, as householders tap into this cost saving energy source. The replacement of oil and gas burners with more efficient systems with renewable energies such as heat pumps or pellet stoves is already largely being installed in all new buildings. The future looks bright indeed for addressing global warming, reducing our greenhouse gases and having a cleaner and sustainable future.
Everyone has a role to play in protecting the environment and start by contacting eirgreen today to see the different ways of saving on your heating bills, cutting down on pollution and securing a more cleaner future for the next generation.