Solar basics
Solar panels turn daylight into electricity. They work best in strong sun, but they keep producing on cloudy days and through the winter, just at a lower output. At night they stop, which is why we often pair our panels with a battery so you can use daytime energy after dark.
How much a system produces depends on its size, measured in kWp, the peak output the panels can reach in ideal conditions. Shade, the angle of the roof and the efficiency of the panels all shape what you get day to day.
We have answered the questions people ask us most, from how a solar system works to what the terms on a quote mean, so you can make sense of solar before you talk to an installer.
Do solar panels work at night?
No. Without light, panels stop producing electricity. However, with a battery, you can use stored solar energy at any time.
Is kWp the same as kW?
No. kW measures the power of standard devices. kWp is specific to solar panels and represents peak power under test conditions.
How do solar panels work?
When sunlight strikes a solar cell, it dislodges electrons from atoms, creating an electric current. Connectors on the cell's positive and negative sides form an electrical circuit. This flow of electrons generates electricity. Solar panels consist of numerous cells, and you can connect multiple panels to create a solar array. The greater the number of panels you use, the more energy you can produce.
Do solar panels work during cloudy weather?
Yes, modern solar panels can still generate electricity during cloudy or low-light conditions. Advanced solar technologies are designed to maintain efficient performance through different weather conditions. Panels capture diffuse light that passes through clouds. Output is reduced, but typically remains between 10% and 75% of peak capacity.
Are solar panels useful in winter?
Yes. Shorter days reduce production, but cooler temperatures slightly improve efficiency. Winter still contributes meaningfully to annual output.
How does shade affect the solar system’s performance?
Solar panels operate most efficiently when they’re able to soak up as much sun as possible. Let your installer evaluate your particular situation and provide some options for you.
Why should I limit shading from trees?
To maximize system production. Trees, plants, rooftop antennas, satellite dishes, and other obstructions can block the sunlight from reaching the panels. If any portion of the panel is shaded, your system will produce electricity at a reduced level. Should you need to trim vegetation or move objects that might shade the panels, please do so during the daylight hours and use caution.
How do solar systems work?
A photovoltaic (PV) solar system is comprised of solar panels, racks for placing the panels on your roof, electrical wiring and an inverter. From sunrise to sunset, the solar panels generate electricity (DC) which is sent to an inverter. The inverter converts the DC electricity into alternating current (AC), which is the type of electricity required for household use. The AC power is delivered directly to your home’s main electrical service panel for use by you and your family.
How efficient are solar power home panels?
Modern residential solar systems deliver excellent energy generation, especially with best solar panels designed for improved low-light performance and higher efficiency.
What are Solar Panels Made of?
PV solar panels are like puzzles made of tiny solar cells, enclosed in glass. These cells are made of silicon, a bit like computer chips. They have a positive part and a negative part that work together to make electricity, kind of like a battery. Solar panels also have special glasses, adhesives and coatings to protect these cells and keep them working well even in different weather conditions.
