Solar panel myths UK homeowners are most often told

Helpful video reference. We use Jordan Farley's video "9 LIES You're Being Told About Solar!" from the Artisan Electrics channel as the video reference here. Jordan Farley is a qualified UK electrician and managing director of Artisan Electrics, a Cambridge-based firm specialising in solar, EV charging and battery storage. The Artisan Electrics channel has over 340,000 subscribers and the video addresses the most persistent myths in plain, UK-specific terms.

1. "Solar panels don't work in the UK because it's too cloudy"

This is probably the most common myth, and it is simply wrong. Solar panels generate electricity from daylight rather than from direct sunshine. The cells respond to the full spectrum of diffuse light, so they produce output on overcast days. On a typical overcast UK day you might expect 10 to 25 per cent of peak output, which is still meaningful when measured across a full year.

The UK had around 17 GW of installed solar capacity by 2025 and solar regularly covers a significant share of UK electricity demand on spring and summer days. Areas of the south of England receive annual solar irradiance comparable to parts of Germany, which is one of the world's largest solar markets. The myth about UK weather probably originates from comparisons with Spain or California, not from any honest assessment of UK solar economics.

2. "The payback period is only five years"

A five-year payback claim should prompt immediate scepticism. For a typical UK domestic system installed in 2025 to 2026, a realistic payback is 8 to 12 years, and often toward the longer end of that range for larger systems with battery storage included.

The calculation depends on three main variables: how much of the solar output you use directly (self-consumption), the SEG export rate you secure with your supplier, and your household electricity consumption. Installers who quote five years are usually making all three assumptions in the most optimistic direction simultaneously. Ask to see the assumptions in writing. If they assume a very high self-consumption percentage (above 50 per cent) for a household where most people are out during the day, or an SEG export rate at the top end of the market, the real figure will be longer.

3. "You need a south-facing roof or it is not worth doing"

South-facing at around 30 to 35 degrees is the optimum orientation and pitch in the UK, but east or west-facing roofs at a similar pitch generate around 15 to 20 per cent less annual output and still make financial sense for most households. Many UK homes have both an east and a west elevation, and splitting the installation across both can actually improve the spread of generation across the day rather than concentrating it around solar noon.

North-facing roof sections are the only configuration where solar PV is genuinely unlikely to stack up in the UK. Everything else is worth modelling with a shading analysis rather than ruled out on orientation alone. A good installer will show you a site-specific generation model, not just a generic figure.

4. "Rent-a-roof gives you free electricity"

Rent-a-roof or free-solar schemes involve a third party paying for the installation in exchange for owning the panels and receiving the SEG export income. You receive the electricity generated while sunlight is available, which has some value, but you do not own the asset and cannot claim the export tariff yourself.

These schemes can complicate remortgaging because the finance arrangement may appear on searches. They can also complicate a property sale if the buyer is wary of taking on an agreement with a third-party energy company. Before entering any scheme where you are not paying for the panels upfront, get the contract reviewed and understand exactly what happens when you want to move or sell. Schemes where the panel company owns the equipment for 20 or 25 years are a significant long-term commitment.

5. "You'll generate all your own electricity"

A typical 4 kWp domestic system in southern England generates around 3,500 to 4,000 kWh per year. Average UK household electricity consumption is around 2,700 to 3,500 kWh per year, so on an annual energy basis the numbers can roughly balance. But the generation does not align with consumption: panels generate mostly between 8 am and 5 pm, with the peak around midday, while household demand often peaks in the evening when people return from work.

Without battery storage or significant daytime loads such as an EV charger on a timer, self-consumption is often 30 to 40 per cent of total generation. The remainder is exported to the grid. Battery storage increases self-consumption but adds cost. You are unlikely to completely eliminate your electricity bill even with a well-sized solar and battery system unless your household has unusually low evening demand.

6. "All solar panels are the same"

Panel quality and performance varies considerably. Standard polycrystalline panels may have efficiencies around 17 to 18 per cent. Premium monocrystalline PERC or TOPCon panels now reach 22 to 23 per cent. On a small roof where you can only fit a limited number of panels, a higher-efficiency panel allows a larger system and more annual generation from the same footprint.

Product warranties (covering manufacturing defects) and performance warranties (guaranteeing a minimum output after 25 years, typically 80 to 85 per cent of rated power) vary between manufacturers. A cheap panel with a weak performance warranty from an obscure brand is a different proposition to a premium panel from an established manufacturer with a UK distributor that will be around in 20 years to honour the warranty. Ask for the panel datasheet and check independently before accepting a substitution.

7. "You must have a battery to make solar worth it"

Solar panels without battery storage give a positive financial return for most UK homeowners who have reasonable daytime electricity loads. A battery increases the return by allowing you to store midday generation and use it in the evening, but the battery itself has a cost and a replacement cycle: most lithium batteries carry a 10-year warranty, so at around year 10 or 12 you face a replacement cost that should be included in any long-term financial model.

If you are comparing quotes, ask each installer to show you the numbers for panels only, then for panels plus battery, so you can assess whether the battery payback makes sense for your household. The right answer depends on your usage patterns and whether you have an EV that could charge during the day, which is one of the most effective ways to increase daytime self-consumption without a battery.

8. "You don't need to check the MCS accreditation"

MCS accreditation is not optional if you want to claim SEG export payments for your solar system. The installation must be carried out by an MCS-accredited contractor using MCS-certified panels and inverter. You must also have a smart meter so the supplier can measure actual exports rather than estimate them.

Before signing a contract, check the installer's MCS number at mcscertified.com. This takes two minutes and confirms the company is authorised to carry out certified work. Some companies subcontract installations to separate firms, so ask whether the MCS number belongs to the company you are contracting with or to a subcontractor. The MCS certificate you receive after installation is your proof for SEG applications and should also be kept for future property sales.

When to call a qualified electrician

The electrical side of a solar installation, including the inverter connection to the consumer unit, DNO notification for export systems above 3.68 kW, and any consumer unit modifications, must be carried out by a qualified electrician registered with a competent person scheme such as NICEIC or NAPIT. If your quote does not mention who will carry out the electrical installation and how it will be certified, ask before you proceed.