Do solar panels work at night?
No, solar panels do not generate electricity at night because they need daylight to work. To use solar power after dark, you add a home battery that stores the surplus your panels generate during the day. Without a battery, you simply draw from the grid at night as you do now, while still saving during daylight hours.
How to use solar after dark
A battery charges from your panels during the day and discharges in the evening when generation stops. This lifts the share of your own electricity you use from around 37% without a battery to roughly 70% with one, which is where the extra savings come from.
Is a battery worth it for night use?
If most of your electricity use is in the evening, a battery can be well worth the £2,500 to £6,000 cost because it lets you avoid buying grid power at around 27p per kWh. If you are home and using power during the day, panels alone may already cover most of your daytime demand.
Frequently asked questions
- Can solar panels charge a battery on a cloudy day?
- Yes, though more slowly. Panels still generate under cloud, so a battery will charge from whatever surplus is available during daylight.
- Do solar panels work in a power cut at night?
- Only if you have a battery with backup capability. A standard grid-tied system shuts down in a power cut for safety.
Related questions
Indicative estimates based on UK average data. Last updated 27 May 2026.