Martin Lewis is one of the UK’s most trusted consumer voices, and through Money Saving Expert he has shared clear, independent guidance on solar panels – focused on whether they genuinely make financial sense for households.
We know many of our customers look to his advice when starting to explore solar, because it is practical, impartial and grounded in real-world costs and outcomes.
In this article, we summarise his key positions on solar panels and explain what they mean in practice for homeowners considering installation.
What Has Martin Lewis Said About Solar Panels?
Overview of His Advice
Martin Lewis provides advice on solar panels that is grounded in financial realism. He does not tell people to rush out and buy a system. Instead, he lays out the numbers, explains the variables, and lets consumers work out whether the case stacks up for their situation.
His overall position is broadly positive, particularly for homeowners who own their property, have a suitable roof, and plan to stay in the home long enough to see a return. He acknowledges the upfront cost is significant, but consistently points to long-term savings and export earnings as the reasons the investment tends to pay off over time.
His advice is notable for being unbiased. Money Saving Expert has no commercial interest in solar installations, which means the guidance is not shaped by affiliate deals or installer partnerships. That independence is a large part of why so many people trust it as a starting point for research.
Role of Money Saving Expert
Money Saving Expert explains solar panel costs in detail, covering everything from average installation prices to how the Smart Export Guarantee works. The site is one of the most widely read personal finance resources in the UK, and its solar panel guides are updated regularly to reflect current costs, schemes, and electricity prices.
The guides on Money Saving Expert walk readers through the full picture: what a system costs, what it generates, what you save, and how long it takes to get your money back. They also flag the questions you should be asking installers and the checks worth doing before you sign anything.
For anyone starting their solar research, Money Saving Expert is a sensible first stop. This article picks up where that starting point leaves off, applying those principles to what Stratford Energy Solutions sees in practice across real installations.
Are Solar Panels Worth It According to Martin Lewis?
Key Benefits Highlighted
Solar panels reduce household energy bills by generating electricity from daylight, which offsets what you would otherwise buy from the grid. Martin Lewis highlights this as the core financial benefit and the main reason the investment tends to make sense for homeowners with a suitable property.
The key benefits he points to are:
- Reduced electricity bills from day one, as the system generates power you use directly
- Export payments through the Smart Export Guarantee, which pays you for surplus electricity sent back to the grid
- Protection against rising energy prices, since generating your own electricity insulates you from future tariff increases
- Long-term return that compounds over the 25 to 30-year lifespan of a quality system
He describes solar as a cost-effective, renewable option for the right household, but he is clear that it is not a get-rich-quick scheme. The returns are real but gradual, and the maths only works well when the system is properly sized and the home is genuinely suitable.
When Solar Panels Make Financial Sense
Consumers compare installation costs and savings before committing, and Martin Lewis encourages that comparison to be thorough and honest. The financial case for solar strengthens when certain conditions are in place.
A south or south-west facing roof with minimal shading produces significantly more electricity than an east-facing or heavily shaded alternative. Output drives savings, so orientation matters.
Daytime electricity usage makes a real difference. If people are at home during the day, they consume more of the electricity the panels generate as it is produced, which maximises savings. If the home is empty during daylight hours, a battery becomes more relevant to capture that unused generation.
System size matched to actual usage is another factor. An undersized system leaves savings on the table. An oversized system costs more upfront without necessarily delivering proportional extra benefit. Getting this right requires a proper assessment of your energy consumption.
Owning your home is a basic requirement. Solar panels are a long-term asset tied to the property, and the return depends on staying in the property long enough to recoup the upfront investment through savings.
Costs, Savings, and Payback Period
Installation Costs Explained
The average solar panel installation in the UK costs between £5,000 and £13,000, depending on system size, roof complexity, and the equipment specified. A typical 4kW system for a mid-sized family home generally sits in the £6,000 to £8,500 range, including panels, inverter, mounting hardware, labour, and commissioning.
The supplier you choose, the panels they use, and the complexity of your roof all influence the final figure. Two quotes for nominally the same system size can differ by £1,000 or more, which is why comparing quotes from multiple certified installers is part of the advice both Martin Lewis and Money Saving Expert consistently give.
The installation cost is a one-off investment. After that, maintenance requirements are minimal, and there are no ongoing costs beyond occasional cleaning and a potential inverter replacement after ten to fifteen years.
Savings and Return on Investment
Solar panels reduce household energy bills from the moment the system is switched on. The saving comes from consuming electricity you have generated yourself rather than buying it from your supplier at the current market rate.
At average UK electricity prices of around 24p to 28p per unit, a 4kW system generating 3,400 kWh per year could save a household £500 to £950 annually depending on how much of the generated electricity is used directly. Consumers compare installation costs and savings to assess whether the return justifies the outlay, and for most households it does.
The payback period for a typical domestic solar installation in the UK is currently estimated at seven to eleven years. After that point, the system continues generating savings for another fifteen to twenty years or more. Over a full system lifetime, the return on investment is often two to three times the original cost, and that figure improves further as electricity prices rise.
Smart Export Guarantee (SEG) and Earnings
What Is the Smart Export Guarantee?
The Smart Export Guarantee is a government-backed scheme that requires licensed energy suppliers to pay households for surplus electricity they export to the national grid. Users export excess energy to the grid whenever the panels generate more than the home is using at that moment, and SEG payments reward exported electricity at a rate agreed with the chosen energy supplier.
To qualify for SEG payments, your solar installation must be MCS-certified, meaning it was installed by a certified engineer to recognised industry standards. Without MCS certification, you cannot register for the scheme and lose access to export earnings entirely.
Export tariffs vary between suppliers and change over time. The rate is expressed in pence per kilowatt-hour, and different suppliers offer different rates under their SEG tariffs.
How Much Can You Earn?
How much you earn from the Smart Export Guarantee depends on two things: how much electricity you export, and the tariff rate your supplier pays. Current SEG rates across UK energy suppliers range from around 1p to 15p per kWh, with the better tariffs generally offered by smaller or more specialist suppliers.
A household exporting 1,500 kWh per year at 5p per unit earns £75 annually from SEG alone. At 12p per unit, that rises to £180. The earnings are not enormous compared to the savings from self-consumption, but they are consistent and they add up over a system lifetime.
To generate, export, and earn the most from your system, compare tariff rates from multiple suppliers before registering, and review those rates periodically. Switching SEG supplier is straightforward and has no impact on your solar system or installation.
Battery Storage and System Options
Should You Get a Battery?
Battery storage is worth considering when your household uses most of its electricity outside of daylight hours. A battery captures surplus electricity generated during the day and stores it for use in the evening or overnight, which increases the proportion of your own solar electricity you actually consume.
Without a battery, a typical household self-consumes around 30% to 50% of what their panels generate. With a battery, that figure rises to 70% or above, which means more of your generated electricity displaces grid electricity you would otherwise be paying for.
Battery capacity is measured in kilowatt-hours. A 5kWh battery suits most average households. Larger batteries of 10kWh or more are better for homes with higher demand, electric vehicles, or those wanting maximum grid independence.
The upfront cost of adding battery storage typically runs from £5,000 to £8,000 on top of the panel installation, which extends the payback period but also increases annual savings . This is the most lucrative option for many homeowners, as a storage battery always leaders to a quicker return on investment, and higher monthly savings.
Martin Lewis’ View on Batteries
The Money Saving Expert position on battery storage is measured. The advice is to consider, compare, and calculate before adding storage, rather than treating it as an automatic addition to every solar installation.
The core question is whether the extra cost of the battery is justified by the additional savings it delivers. For households who are out during the day and use most electricity in the evening, the answer is often yes. For households who are home all day and already consuming a high proportion of their generation directly, the battery adds less incremental value.
The honest calculation involves looking at how much surplus electricity you currently export without a battery, what that electricity is worth under the Smart Export Guarantee, and whether storing and using it yourself would save more than exporting it. In most cases with current electricity prices, using your own electricity is more valuable than selling it back to the grid, which tilts the calculation in favour of storage.
Grants, Schemes, and Financial Support
Available UK Schemes
Consumers compare installation costs and savings more favourably when grants and incentives are factored in. The UK government has several schemes in place that can reduce the net cost of going solar or improve the overall return.
Smart Export Guarantee (SEG) is the primary ongoing incentive, covered above. It does not reduce the upfront cost but contributes to lifetime returns.
ECO4 Scheme provides funding for energy efficiency improvements, including solar panels in some cases, for households on qualifying low incomes or benefits. Eligibility is assessed based on income and the property’s energy performance rating.
Great British Insulation Scheme is focused on insulation rather than solar directly, but improvements to your home’s energy efficiency rating can make a solar installation more effective and may be worth combining.
Local authority grants vary by region. Some councils, particularly in the Midlands, have run schemes supporting renewable energy upgrades for residential and social housing properties. Checking directly with your local council is worth doing before committing to an installation.
For landlords and business owners, capital allowances and tax relief on energy-efficient equipment are additional considerations worth raising with an accountant.
Key Tips from Martin Lewis Before Installing Solar Panels
Compare Suppliers and Tariffs
One of the most consistent pieces of advice from Martin Lewis is to compare before you commit. That applies both to installation quotes and to the energy suppliers you will use once your system is live.
On the installation side, get at least three quotes from MCS-certified installers and make sure each one is based on the same system specification. Ask about panel brand and efficiency rating, inverter type, warranty terms, and what aftercare looks like. Review the detail, not just the headline price.
On the energy supplier side, review your current tariff and compare SEG export rates across providers before registering. The spread between the best and worst export tariffs is wide enough to make a meaningful difference to your earnings over time. Switching is straightforward, so there is no reason to accept a poor rate.
Make an Informed Decision
Consumers compare installation costs and savings most effectively when they have a clear picture of their own energy usage first. Before approaching any installer, it is worth pulling together your average annual electricity consumption from recent bills. That figure is the starting point for any sensible system recommendation.
From there, the key variables to evaluate are: payback period based on your specific usage and roof, panel efficiency relative to your available roof area, system size matched to actual demand, and the total cost including any battery storage you are considering.
Solar panels are a long-term commitment. The financial return is genuine, but it requires patience and a system that has been properly designed for your home. Martin Lewis says as much: the decision should be practical, evidence-based, and grounded in your own numbers rather than a generalised promise of savings.
At Stratford Energy Solutions, every installation starts with a detailed assessment of your property and energy usage. We design systems to your specific circumstances, provide honest projections, and back everything with long warranties and ongoing monitoring support. If you want a clear picture of what solar could deliver for your home, we are happy to talk it through.