How Much Sunlight Do Solar Panels Really Need?

It’s easy to assume that solar panels need bright, direct sunshine to work properly, and when you picture solar panels, you may picture a hot summer’s day with the sun shining down on a roof. But actually, that’s not how it works.

So, how much sunlight do solar panels need? The short and easy answer is: less than you think.

Solar panels generate electricity from daylight, rather than relying solely on strong, direct sunshine. That means they still produce energy on cloudy and overcast days (which, let’s face it, we get plenty of in the UK). This is particularly important for homeowners if sunshine isn’t always guaranteed where they live.

But how does this work, and how much daylight is really ideal for solar panels? Let’s take a closer look!

How Do Solar Panels Generate Electricity?

Solar panels use a technology called photovoltaics (commonly referred to as PV) to turn light into electricity.

Without us getting too technical, solar cells within each solar panel absorb light from the sun. This then creates an electrical current, which is then converted into usable electricity for your home. It’s important to note that it’s the daylight, rather than the heat from the sun, that your solar panels need to work.

That means that a chilly but bright spring day can actually be very productive for solar panels. In fact, solar panels tend to work more efficiently in cooler temperatures than they do in extremely hot conditions. So, you don’t need scorching sunshine for your panels to generate electricity.

This is one of the reasons why solar panels can work surprisingly well in the UK. While it’s true we may not have continuous sunshine, we still receive plenty of daylight all year round.

So, Do Solar Panels Need Direct Sunlight?

No. While direct sunlight provides a more concentrated light and therefore allows your panels to generate more electricity, solar panels need just daylight to function. This is why your solar panels don’t simply stop working when the sky turns grey.

On a heavily overcast day, your system may produce less electricity than it typically would in bright sunshine. However,  it can still generate power throughout the day. The exact amount will depend on factors such as the amount of cloud cover, the time of year, your solar panel installation, and the orientation of your roof.

Still unsure? There’s plenty of real-world evidence that solar works in less sunny climates. The UK has adopted solar power extensively across the country despite it being famous for its typical British weather. So, if you’ve ever looked out of the window at a typically British cloudy sky and thought, “No way solar panels will work here,” you’re most probably not alone, but you might be pleasantly surprised.

How Much Light is Ideal for Solar Panels?

It’s true, the more light your panels receive, the more electricity they can potentially generate. One term you’ll often come across when researching solar power is “peak sun hours”.

A peak sun hour doesn’t simply mean an hour when the sun is visible. Instead, it refers to the equivalent of one hour of sunlight at an intensity of 1,000 watts per square metre. So, several hours of weaker sunshine can collectively add up to a peak sun hour.

Where you live, what season it is, and local weather conditions all factor into the number of peak sun hours your area receives. However, this absolutely doesn’t mean that solar panels aren’t worthwhile in the UK; the key is to make the most of the available daylight.

For homes in the UK, roof orientation and angle can make a significant difference. South-facing roofs are traditionally considered the best option as they receive a good amount of sunlight throughout the day. However East- and west-facing roofs can also work very well, particularly if you’re looking to generate electricity during specific parts of the day.

Having said that, your roof doesn’t need to be perfectly facing south or at the “perfect” angle for solar panels to make sense. A professional assessment will take into account the specific characteristics of your property. Book your free solar consultation with SKYGLO today. 

How Well Do Solar Panels Work on Cloudy Days?

This is a huge question, and one of the most commonly asked by anyone considering solar in the UK. Modern solar panels have become increasingly effective at making use of lower levels of available light. There’s been significant improvements in panel technology, meaning that they can continue to generate electricity for your home even when conditions are less than perfect.

It’s worth mentioning that solar panels don’t need to produce the same amount of electricity every day to be worthwhile. Solar generation naturally varies throughout the year. A typical house will produce more electricity during the longer and brighter days of spring and summer, and less during the shorter days of autumn and winter. 

This is why solar battery storage can be particularly useful and well worth the investment. Throughout spring and summer when your panels are generating a lot of energy, any electricity you don’t use, you can store away for a rainy day (literally). This also comes in handy if you are out of the house for most of the day. If you tend to use most of your electricity in the evening once the sun has set, a solar battery will store all of the electricity your panels have generated throughout the day so you can use it later in the evening when you need it, rather than buying energy from the grid.

Is Your Home Suitable For Solar Panels?

At the end of the day, you don’t need a house with uninterrupted sunshine from morning until evening to benefit from solar panels.

They need daylight, not constant direct sunshine, and modern solar technology is well suited to the UK’s variable weather. So while sunny conditions will always help to maximise generation, cloudy skies don’t mean your panels are doing nothing.

So, if you’ve been putting off solar because you live somewhere that gets its fair share of cloudy days, it’s perhaps time to rethink that assumption. Get in touch today to book your free solar consultation. We’ll assess your property and design a system suited to your home and household.