Solar panel efficiency: Powering sustainable homes.
How efficient are solar panels?
Photovoltaic solar panels are highly efficient in converting sunlight into electricity. The efficiency of a solar panel is measured by how much of the sunlight that hits the panel is converted into electricity. The efficiency of solar panels has steadily increased over the years, and they are now typically around 20-25% efficient. This means that for every 100 watts of sunlight that hits a solar panel, around 20-25 watts will be converted into electricity.
There are a number of factors that affect the efficiency of photovoltaic solar panels, including:
The type of solar cell used.
The amount of sunlight available.
The temperature of the solar panel.
Solar panels are most efficient on sunny days when the sun is directly overhead. They are less efficient on cloudy days or when the sun is at a low angle. Solar panels are also less efficient when they are hot, so it is important to keep them cool in hot climates.
Despite their high efficiency, solar panels still produce a relatively small amount of electricity compared to other sources of energy, such as coal or natural gas. However, solar panels are a clean and renewable source of energy, and they can help to reduce our reliance on fossil fuels.
Do solar panels make sense for my home?
If you're considering installing solar panels on your home, there are several factors to consider to determine if it's the right choice for you.
By carefully considering these factors, you can determine if solar panels make sense for your home. If you decide to install solar panels, you'll be making a long-term investment that can save you money on your electricity bills and reduce your environmental impact.
Your electricity usage.
Solar panels can generate electricity to offset your household's electricity consumption, potentially reducing your electricity bills. However, it's important to accurately assess your electricity usage to determine if solar panels can generate enough electricity to meet your needs.
The amount of sunlight your home receives.
Solar panels require sunlight to generate electricity, so it's important to evaluate the amount of sunlight your home receives throughout the year. Homes in sunny climates with long daylight hours are ideal for solar panels.
The size and orientation of your roof.
The size and orientation of your roof will determine how many solar panels you can install and the amount of electricity they can generate. Ideally, your roof should be large enough to accommodate a sufficient number of solar panels, and it should face south to maximise sunlight exposure.
The cost of solar panels.
The cost of solar panels has decreased significantly in recent years, but it's still a significant investment. It's important to consider the upfront cost of installation as well as any ongoing maintenance costs.
Government incentives and rebates.
The government offers incentives to encourage homeowners to install solar panels. These incentives can reduce the cost of solar panels and make them more affordable.
Your environmental goals.
If you're concerned about the environment and want to reduce your carbon footprint, solar panels can be a great way to do so. Solar panels generate clean, renewable energy that doesn't produce greenhouse gases.
Unlocking efficiency: How can efficient solar panels benefit you?
Solar panels are a clean and renewable source of energy that can help you save money on your electricity bills and reduce your carbon footprint. However, not all solar panels are created equal.
The efficiency of a photovoltaic solar panel is measured by how much of the sunlight that hits the panel is converted into electricity.
Efficient solar panels offer several benefits over less efficient panels.
Increased electricity generation.
Efficient solar panels can generate more electricity from the same amount of sunlight, which means you can install fewer panels to meet your energy needs.
Reduced system costs.
Because you need fewer panels, the overall cost of your solar system will be lower.
Improved performance in low-light conditions.
Efficient solar panels perform better in low-light conditions, such as on cloudy days or in the early morning and evening hours.
Longer lifespan.
Efficient solar panels typically have a longer lifespan than less efficient panels.
How to choose efficient solar panels.
When choosing solar panels for your home, it is important to consider the following factors:
Panel efficiency: Look for panels with an efficiency rating of at least 20%.
Temperature coefficient: The temperature coefficient measures how much the panel's efficiency decreases as the temperature increases. Look for panels with a low temperature coefficient.
Warranty: Choose panels with a long warranty, such as 25 years or more.
Financing your solar panel investment.
We understand the importance of flexibility when it comes to payment options for solar panel installation.
1Pay in full.
For a quick and easy process, you can choose to pay the full amount upfront for your solar system. This option does not require a credit check.
2Pay in three easy instalments.
Pay a 25% deposit up front, 50% when materials are ordered and 25% on completion.
30% APR* finance available.
Enjoy the convenience of spreading the cost of your solar system with our 0% APR＊ finance options for up to 2 years.
Can a battery storage system maximise efficiency?
Absolutely! Adding a battery storage system to your solar panels is a fantastic way to maximise your energy independence and self-sufficiency. With a battery storage system, you can store excess solar energy generated during the day and use it to power your home at night or during power outages. This can significantly reduce your reliance on the grid and further lower your electricity bills.
Here are some of the benefits of getting a battery storage system with your solar panels:
Increased energy independence: With a battery storage system, you can store excess solar energy and use it when you need it, reducing your reliance on the grid.
Lower electricity bills: By using stored solar energy to power your home, you can significantly reduce your electricity bills.
With careful planning and consideration, adding a battery storage system to your solar panels can be a wise investment that provides numerous benefits for years to come.
Polycrystalline solar panel efficiency versus monocrystalline solar panel efficiency.
The most common solar panels for residential installation are monocrystalline and polycrystalline, and there are pros and cons to both. However from an efficiency perspective, monocrystalline panels are around 20% efficient whereas polycrystalline are about 15-17% efficient1.
Get up to £200 off new solar panels and batteries.
E.ON are currently offering £200 off solar panels and battery storage and £150 off solar panels, so don't miss out. T&Cs apply.
Frequently asked questions
How much will I save on my energy bills with solar panels?
The amount you save on your energy bills with solar panels depends on several factors, including:
- The size of your solar system.
- The amount of sunlight your home receives.
- Your local electricity rates.
- Your current energy consumption.
To estimate how much you could save on your energy bills with solar panels, you can use a solar calculator or contact us.
How long will it take to recoup the upfront cost of my solar panels?
The time it takes to recoup the upfront cost of your solar panels will vary depending on a number of factors, including:
- The size of your solar system.
- The amount of sunlight your home receives.
- Your electricity usage.
- The cost of electricity in your area.
- Any government incentives or rebates you receive.
However, as a general rule of thumb, most homeowners can expect to recoup the upfront cost of their solar panels within 8 years. After that, the savings on your electricity bills will start to add up, and you will continue to enjoy the benefits of free solar energy for many years to come.
Does my roof qualify for solar panels?
To determine if your roof qualifies for solar panels, you need to consider several factors:
- Roof orientation and pitch: Solar panels work best when they face south and have a steep pitch, as this maximises sunlight exposure. However, solar panels can still be installed on roofs with other orientations and pitches, but the efficiency may be lower.
- Roof condition: Your roof should be in good condition and able to support the weight of solar panels. If your roof is old or damaged, it may need to be repaired or replaced before solar panels can be installed.
- Roof space: You need to have enough roof space to accommodate a sufficient number of solar panels to meet your energy needs. The size of your roof and the efficiency of the solar panels you choose will determine how many panels you need.
- Shading: Solar panels need direct sunlight to generate electricity, so it is important to assess the amount of shading your roof receives from trees, buildings, or other obstructions. If your roof has significant shading, it may not be suitable for solar panels.
If you are unsure whether your roof qualifies for solar panels, contact us today.
What are the UK government grants and incentives available for solar panels?
The government has created several grants and schemes to assist low-income homeowners and tenants of private and social housing to improve the energy efficiency of their homes through upgrades that may include solar panels.
Depending on your household income and the type of benefits you may receive, you could be eligible for funding. If you are eligible, solar panels may be part of a package of upgrades available to you, subject to a home survey. Find out through our quick and easy eligibility checker.
What does 20% efficiency on a solar panel mean?
This means that for every 100 watts of sunlight that hits your solar panels, around 20 watts will be converted into electricity.
The legal bit.
- ＊ E.ON Energy Installation Services Limited is a credit broker not a lender and work exclusively with HomeServe Finance Limited who acts as the lender under Firm Reference Number 994955. Any credit is subject to status, affordability and a credit check; HomeServe Finance Limited terms and conditions apply. E.ON Next Energy Limited is an Introducer Appointed Representative of E.ON Energy Installation Services Limited and is authorised and regulated by the Financial Conduct Authority under Firm Reference Number 973651. Zuno Partners Limited is an Appointed Representative of E.ON Energy Installation Services Limited and is authorised and regulated by the Financial Conduct Authority under Firm Reference Number 1043798. E.ON Energy Installation Services Limited is authorised and regulated by the Financial Conduct Authority for credit broking services under Firm Reference Number 750410. Registered in England and Wales under company number 09965944 at Westwood Way, Westwood Business Park, Coventry, CV4 8LG.
- 1. Monocrystalline vs Polycrystalline Solar Panels (This Old House)