Do Solar Panels Work When the Sun Is Not Out?

A common question we encounter at Apollo Energy is whether solar panels continue to work when the sun isn’t out. It’s a valid concern, especially for those living in areas with variable weather conditions. Let’s clarify how solar panels function during cloudy days, at night, and under less-than-ideal sunlight conditions.

1. Solar Panel Basics:

Solar panels generate electricity through photovoltaic (PV) cells, which convert sunlight into energy. These cells require light — not necessarily direct sunlight — to produce power. The efficiency of power generation depends on the intensity and duration of the light received.

2. Performance on Cloudy Days:

Solar panels can still function on cloudy days but at reduced efficiency. Clouds diminish the intensity of sunlight, which reduces the energy produced by your panels. Generally, solar panels can produce about 10% to 25% of their rated capacity under heavy cloud cover. The exact output depends on the thickness of the clouds and the type of solar panel.

3. Indirect Light:

Even when direct sunlight is blocked, solar panels can use diffuse or scattered light. Although this will not generate as much power as on clear, sunny days, it ensures that some energy production continues, contributing to your home’s power needs.

4. Solar Panels at Night:

Solar panels do not produce electricity at night because they need sunlight to generate power. However, this is where solar batteries can play a crucial role. If your system includes battery storage, you can store excess energy generated during the day and use it at night, which maximises the usability of your generated solar power.

5. Maximising Efficiency:

To ensure that your solar panels operate efficiently, even during cloudy days or in less sunny conditions, consider the following:

• Proper Installation: Ensure that your solar panels are installed in the most advantageous orientation and angle to capture maximum light throughout the day.
• Regular Maintenance: Keep the solar panels clean and free from obstructions like dust and debris, which can block light and further reduce efficiency.
• System Upgrades: Technologies like micro-inverters or power optimisers can help enhance the performance of your solar panels by optimising the conversion of solar energy under various light conditions.
  

6. Technology Advancements:

The technology behind solar panels is continuously improving. Newer models are increasingly efficient at converting lower levels of light into usable energy. Innovations in materials and design are making solar panels more effective even in less ideal weather conditions.

Conclusion:

While solar panels perform best in direct sunlight, they don’t stop working when the sun is not out. They can still generate electricity from indirect light, albeit at reduced efficiency. For continuous power supply, especially during the night or very cloudy days, integrating battery storage can be a practical solution.

Curious about integrating solar panels and battery storage into your home energy system? Contact Apollo Energy for guidance and solutions tailored to your needs, ensuring you get the most out of your solar investment, regardless of the weather.

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