Solar panels can seem like quiet magic — put them on your roof and your electricity bills fall. But the technology behind them is straightforward once it’s explained clearly. Here’s how solar panels turn sunlight into electricity for your home, without the jargon.
Turning sunlight into electricity
Solar panels are made up of many photovoltaic (PV) cells, usually built from silicon. When daylight hits these cells, it energises electrons in the silicon and sets them moving — and moving electrons are, quite literally, an electric current. This is called the photovoltaic effect. Importantly, panels respond to daylight, not just direct sun, so they still generate on cloudy days, just at a lower rate.
From panel to plug: the inverter
The electricity a panel produces is direct current (DC), but your home runs on alternating current (AC). That’s the job of the inverter — it converts the DC from your panels into AC that your appliances can use. The inverter is the brain of the system, and its quality has a big impact on how much usable power you get, especially in partial shade. It’s why we install trusted brands like SolarEdge.
What happens to the power you generate?
Once converted, the electricity flows to your home in a simple order of priority:
- Used in your home first — any appliances running at the time draw on your solar power before anything else.
- Stored, if you have a battery — surplus power charges a home battery for use later, such as in the evening.
- Exported to the grid — anything left over is sent back to the grid, and under the Smart Export Guarantee your supplier pays you for it.
When your panels aren’t generating enough — at night, for instance — your home simply draws from your battery or the grid as normal. The switch is seamless and automatic.
Do they work in the UK climate?
Yes. Solar panels rely on daylight rather than heat, so the UK’s climate is perfectly suitable — and the South Coast, including Dorset and Hampshire, enjoys some of the highest sunshine hours in the country. Modern panels are efficient enough to make solar well worthwhile here, as we explain in our guide to whether solar panels are worth it.
Frequently asked questions
Do solar panels work on cloudy days?
Yes. Panels generate from daylight, not just direct sun, so they still produce electricity when it’s overcast — just less than on a bright day.
Do solar panels work at night?
No — they need daylight to generate. That’s where a battery helps: it stores the power you make during the day so you can use it after dark instead of buying from the grid.
Do solar panels need much maintenance?
Very little. With no moving parts they’re low-maintenance — an occasional clean and a periodic system check are usually all that’s needed to keep them performing well.
Thinking about solar for your home?
Now you know how it works, the next step is finding out what a system would do for your home. As MCS- and NAPIT-certified installers covering Bournemouth, Poole and the wider South Coast, we’ll design one around your roof and usage. Get your free, no-obligation quote.
This guide is part of our complete guide to solar panels.