The majority of solar panels on domestic systems in the UK are around 10-20% efficient although some types of solar panels can reach an efficiency level of up to 25%.

Here we’ve compared the best solar panel manufacturers on the market to which offers the highest efficiency. Solar cell efficiency will have a direct impact on how much sunlight is converted into electricity by your panels and therefore how much you could save on energy bills.

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What does solar panel efficiency mean?

Solar panel efficiency ratings tell you how effective a solar panel is at converting sunlight into electricity. It is represented by a percentage and most solar panels for residential installations are between 15-20% efficient.

Whilst this might sound like a low figure, a 4 kW solar panel system could generate enough electricity to dramatically reduce your energy bills and carbon emissions. The kW rating on solar panels is the power output. Solar power outputs represent how much electricity the panels are capable of providing for your home.

太阳能电池板效率计算

太阳能电池板的效率是由科学家在受控的实验室条件下计算出来的。太阳能电池板效率的标准测试条件（STC）是观察在25°C的晴天，辐照度为1000 W/m2时，电池能转化为电能的太阳能量。

However, the weather is rarely consistent and certainly not always sunny in the UK. While solar panels will still generate electricity on a cloudy day, the efficiency level will decrease. The maximum efficiency level is not necessarily what the panels will achieve in real-world conditions. For this reason many solar panels now have a PTC rating which tells you how they perform in a variety of climates. There may also be a system PTC rating which represents how efficiently the inverter converts solar energy into electricity.

Solar panel efficiency by type

太阳能电池板有三种类型，你选择的类型将决定它们的效率和发电量。

单晶硅太阳能电池板是太阳能电池板中效率最高的一种，因为电池是由一块单晶硅构成的。这也是更昂贵的太阳能电池板类型。

Polycrystalline solar panels are made up of multiple silicon crystals which means there are spaces between them and not as much silicon to convert solar energy. This makes them slightly less efficient than monocrystalline but they are often larger (and cheaper) to compensate.

Thin-film solar cells are thin layers of silicon on top of electrical components. They are less efficient than monocrystalline or polycrystalline but are cheaper, lighter and more flexible.

The most efficient solar panels

在这个太阳能电池板效率比较表中，我们重点介绍了为英国家庭制造的效率最高的太阳能电池板。

制造商	Highest Efficiency Available*
LG公司	21.4%
松下	19.7%
加拿大太阳能	19.89%
太阳城& IKEA	16.82%
Sharp	20%
SolarWorld	17.89%
英利Solar	19.1%

*Excluding bifacial solar panels

比较这些太阳能电池板更详细地在我们的审查报告2019年最好的太阳能电池板是什么？.

最好的办法，以确保您的太阳能光伏系统是尽可能有效的是有一个MCS认证（或同等）和经验丰富的太阳能安装评估您的需要，你可以找到使用亚博网站官网.

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太阳能电池板效率随时间的变化

由于太阳能电池的自然退化（每年约0.5%），太阳能电池板的效率确实会随着时间的推移而降低。大多数太阳能电池板制造商将提供20-25年的性能保证，保证电池板在该期间仍能工作到电池板原始容量的85%左右。

还有什么会降低太阳能电池板的效率？

还有一些其他因素影响太阳能电池板安装的效率。大多数这些都应该考虑之前，你有系统安装和信誉良好的太阳能安装将能够建议你的最佳选择你的家。

Shading

一块太阳能电池板上只有少量的阴影会产生很大的影响，事实上，一些报告表明，只有10%的太阳能电池板处于阴影中，其效率就会降低50%。在你家安装太阳能电池板之前，安装者应该进行遮阳分析，以评估烟囱或树木等障碍物可能造成的任何问题。

Panel placement

在英国，建议将太阳能电池板安装在朝南的屋顶上，以获得最佳效率。虽然它们可以放在一些东西向的屋顶上，但产量水平要低得多。

屋顶沥青

The pitch, or angle of your roof can affect the number of hours of sunlight your panels receive in a day. For this reason it’s important to consider the pitch of your roof before installation. The best pitch for domestic solar arrays in the UK is around 30-45 degrees.

维护

Whilst regular rainfall can clean solar panels, occasionally they may need cleaning more thoroughly to remove any bird droppings or dirt that could be reducing efficiency. The easiest way to go about this is hiring a professional as they will have the experience and equipment to carry out the cleaning safely.

温度

太阳能电池板被设计用来收集来自太阳的能量，但当它们变得太热时，它们的效率实际上会降低。这在英国一般不应该是个问题，因为我们很少看到足够高的温度导致任何问题。

What are bifacial solar panels?

传统的太阳能电池板一面有光伏电池，一面面朝屋顶，另一面是双面太阳能电池板，正面和背面都有光伏电池。安装双面太阳能电池板在反射表面的顶部最大限度地提高了能量的产生，一些制造商声称他们可以多产生30%的能量。

Why compare quotes for efficient solar panels?

By comparing several quotes and types of panels you can find the most efficient at the best price. Solar panels offer some great long-term benefits for UK homeowners including:

更便宜的能源账单

The reason most homeowners turn to solar energy is to reduce their ever increasing energy bills. Your own solar panel system would be generating free electricity from the renewable energy of the sun rather than buying it from a supplier.

Free electricity all year round

太阳能电池板仍然可以发电，即使在阴天，让你得到最大的太阳能电池板全年。

Smaller carbon footprint

太阳能是可再生的（它不会在人类的时间尺度内耗尽），而且，与大多数来自电网的电不同，它不需要燃烧化石燃料，这意味着你对大气贡献的碳更少。

减少对能源供应商的依赖

使用太阳能板的免费可再生能源发电减少了您对能源供应商的依赖，正如我们提到的，这将减少您的能源账单。

Get the most efficient solar panels installed

如果一年四季较低的能源费用说服你在家的屋顶安装太阳能电池板系统，那么下一步就是决定你想安装哪些太阳能电池板。一旦你决定，你需要找到一个完全合格的太阳能安装进行安装，这是我们可以帮助。

Complete one of our simple online forms and you’ll be contacted by up to 3 MCS certified (or equivalent) solar companies in your local area who will each provide a quote. Comparing multiple quotes gives you the greatest chance of finding the best deal possible for the solar panel installation, as you can compare and pick the one that’s right for you.

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