Do Solar Panels Work at Night?
No. Solar panels do not produce electricity at night. They need photons from sunlight (or daylight) to generate power — and at night there is no light reaching the panel. However, a solar battery can store daytime electricity and power your home overnight, and the UK grid fills in the rest.
Quick Answer
Solar panels stop generating electricity when it is dark. A typical UK home with solar panels uses a solar battery to store daytime output for use at night, or imports electricity from the grid overnight. The Smart Export Guarantee still pays you for daytime exports.
Why don't solar panels work at night?
Solar panels convert photons — particles of light — into electricity using the photovoltaic effect. At night there is no sunlight to provide photons, so the panel produces zero output. Street lights, moonlight, and household lighting are millions of times weaker than sunlight and cannot generate a measurable current.
Panels also stop generating well before full darkness. Output drops to effectively zero around 30–45 minutes before sunset and restarts about the same time before sunrise. On a cloudy UK winter day, useful generation may only last 6–7 hours.
How do homes get solar power at night?
UK homes with solar panels handle night-time use in three ways:
- Solar battery storage. Excess daytime generation is stored in a battery (typically 5–10 kWh) and discharged overnight. A well-sized battery can cover 70–90% of evening and night-time demand for a typical household. See our solar battery storage guide.
- The grid. Without a battery, your home simply imports electricity from the grid overnight at your standard tariff rate. This is identical to a home without solar.
- Time-of-use tariffs. Tariffs like Octopus Go and Intelligent Octopus charge your battery from the grid at cheap overnight rates (around 7p/kWh), then the battery powers your home during peak hours. Combined with solar, this is the cheapest setup currently available in the UK.
Do solar panels work with moonlight?
Technically yes — a full moon produces enough photons for a solar panel to register a measurable voltage. But the output is essentially useless: a full moon delivers roughly 1/400,000th of direct sunlight. A 4kWp system that produces 4,000 watts at noon might produce about 0.01 watts under a full moon. This is not enough to power anything and does not contribute to your home.
Frequently Asked Questions
Do solar panels work in the dark?
No. Solar panels need light to generate electricity. At night, they produce no usable power. A solar battery stores daytime electricity for night-time use.
What happens to solar panels at night?
They simply stop generating. There is no damage and no maintenance required — the panels sit idle until sunrise. Your inverter also enters a low-power standby mode.
Can solar panels charge at night from the grid?
The panels themselves cannot charge — they are generators, not batteries. But if you have a solar battery, it can be charged from the grid overnight on a cheap time-of-use tariff like Octopus Go (around 7p/kWh).
Do solar panels work with moonlight?
Technically yes — a full moon produces enough photons for a panel to register a tiny voltage. But output is roughly 1/400,000th of direct sunlight, so it's useless in practice.
Do solar panels work on cloudy days?
Yes — panels generate electricity from diffuse daylight on cloudy days, just at reduced output (typically 10–25% of peak).
Do I need a battery to make solar worthwhile?
No. Without a battery, you self-consume around 30–40% of your solar generation during the day and export the rest to the grid via the Smart Export Guarantee. With a battery, self-consumption rises to 70–90%, which typically adds 2–4 years to your payback period but increases long-term savings.
Do solar panels work in winter?
Yes. UK panels generate electricity year-round, with winter output being 10–20% of summer peak. See our dedicated guide on solar panels in winter.
Related solar performance guides
Related Guides
Battery Storage
Solar battery costs, sizing, popular models, and payback analysis.
Solar Panels in Winter
Winter output data, monthly breakdown, and performance tips.
How Solar Panels Work
Plain-English guide to solar PV technology.
Solar Panel Output
How much electricity solar panels produce by system size in the UK.
Sources
- Energy Saving Trust — Solar Panels — energysavingtrust.org.uk
- Ofgem — Smart Export Guarantee — ofgem.gov.uk
Last updated: April 2026
Fact-checked by John Rooney, Solar Energy Editor. Editorial policy
John Rooney is the founder of Solar Info and has been covering the UK solar energy market since 2023. He fact-checks all content against official MCS and Ofgem data and maintains relationships with MCS-certified installers across the UK.
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