Solar panel and battery costs in Kent: what drives the price

Updated 9 November 2026 · 11 minute read · General guidance only: check your own project with your council, Building Control and a qualified professional.

What you are paying for in a solar quote

A solar quote is a bundle of equipment, labour and paperwork. Knowing the parts makes it much easier to see why prices differ.

• System size: measured in kilowatts peak (kWp), the maximum output in ideal conditions. The Energy Saving Trust says the average home system is around 4.5 kWp, typically about 12 panels covering 20 to 30 square metres of roof. More panels mean more equipment and more fitting time.
• Panels: most installers now fit monocrystalline panels. Higher-output or all-black panels usually cost more per panel but can fit more capacity on a small roof.
• Inverter: this converts the panels' direct current into the alternating current your home uses. A single string inverter is usually the simplest option. Optimisers or microinverters, which let each panel work independently, cost more but can help on shaded or split roofs. A hybrid inverter runs panels and a battery together.
• Mounting and fixings: roof hooks, rails and fixings designed for your roof covering. Slate, plain clay tiles and flat roofs can need different kits.
• Labour, testing and paperwork: fitting, commissioning, the MCS certificate and notifying the network operator, UK Power Networks in Kent. Most supply-and-fit quotes include MCS certification and the grid notification, but check.
• Optional extras: a battery, an EV charger, bird mesh, monitoring and a solar diverter for a hot water cylinder are usually priced separately.

Typical UK prices for solar panel systems

The table below shows typical UK figures from our 2026 price research, alongside figures published by the Energy Saving Trust and the government. They are not Kent quotes, and each makes different assumptions about system size and what is included. Your quotes will vary. The official sources are linked at the end of this page.

On location, the same government data gives regional averages. For the South East, the mean cost per kW in 2025-26 was about £1,859 for 0 to 4 kW systems and about £1,721 for 4 to 10 kW systems, slightly above the Great Britain means. There is no separate figure for Kent, so the honest answer is to get several local quotes.

What home batteries cost

Battery prices vary more than panel prices, because capacity, power output, brand and the inverter arrangement all differ. Typical figures include:

The Energy Saving Trust and MCS both say it is usually more cost-effective to fit a battery at the same time as the panels, because the installer is already on site and can design one system. The Energy Saving Trust also notes that a battery's lifespan is shorter than the panels', so expect to replace it at some point. The battery guide on this site explains sizing and whether a battery suits you.

Scaffolding, roof type, bird mesh and other extras

Extras and site conditions are where quotes for similar systems drift apart. Check whether each of these is included, excluded or priced as an option. The figures below are typical 2026 ranges from our own price research, and quotes will vary.

• Scaffolding: a detached house with side access is simpler than a three-storey terrace on a narrow street, where scaffolding may need a licence from the highway authority, Kent County Council in most of Kent or Medway Council in Medway.
• Roof type: special mounting for slate roofs, structural strengthening or roof repairs all add cost. Flat roofs usually need angled frames, and ballast or fixings that keep the roof watertight.
• Bird mesh: pigeons can nest under panels, so many installers offer mesh around the edges. It is cheaper to fit at installation than later, when scaffolding has to go back up.
• EV charger: a charge point usually needs its own circuit and sometimes a supply check. Fitting it with the solar system saves a separate visit, and some chargers can divert surplus solar into the car.

0% VAT on home solar and batteries until March 2027

HMRC's VAT Notice 708/6 says the installation of solar panels in residential accommodation is zero-rated from 1 May 2023 to 31 March 2027. Batteries that store electricity were added to the zero rate from 1 February 2024, and the notice says the zero rate also covers retrofitting a battery to an existing solar system in a home. From 1 April 2027, the notice says these installations revert to the reduced rate of 5%.

• The zero rate applies to the installation in residential accommodation. Business and commercial installations follow different rules, so speak to an accountant.
• Buying panels or a battery on a supply-only basis is treated differently from a supply-and-install contract.
• Check that VAT is shown correctly on the quote and the invoice, and ask what happens if the work is delayed close to the 31 March 2027 date.

Why your savings depend on usage, tariffs and export

The same system can save one household far more than another. Three things matter most: how much of the solar electricity you use yourself, what you pay for electricity you import, and what you are paid for electricity you export.

• Self-use: electricity you use as it is generated replaces electricity you would otherwise buy. Households at home in the day, or with a battery, heat pump or EV, tend to use more of their own generation.
• Import tariff: the higher your unit rate, the more each self-used unit is worth. Time-of-use tariffs change this, especially with a battery.
• Export rate: the Energy Saving Trust says you will typically get around 12p for each unit exported through the Smart Export Guarantee, while you would normally pay more than twice that to buy a unit, which is why using your own solar is usually worth more than selling it.

As an example of published estimates, the Energy Saving Trust gives payback periods for solar panels with export payments, based on fuel prices as of July 2026. These are estimates for a typical system, not predictions for your home.

Other estimates use different assumptions about electricity prices, export rates and how much of the generation you use yourself, so two savings figures for the same system can look quite different. Export rates in particular vary a lot between Smart Export Guarantee tariffs, which is why it pays to check which rate an estimate uses.

How to judge an installer's savings estimate

MCS-certified installers must give you a generation estimate and a self-consumption estimate in a standard format before you sign. Any savings figure is then built on top of those numbers with prices that the installer chooses. MCS's Customer Commitment says installers should make you aware that you shouldn't sign a contract based on specific energy prices, because tariffs vary and change. Work through these checks:

1. Find the generation figureCheck the annual kWh figure comes from the MCS method, with the system size, orientation, pitch and shade factor shown. The installer guide on this site explains the format.
2. Check the self-use assumptionAsk what share of the generation they assume you will use yourself, which occupancy type they picked, and what annual electricity use they assumed. Compare it with your own bills.
3. Check the pricesAsk which import unit rate and export rate they used, and when those rates applied. The Energy Saving Trust suggests asking exactly this question.
4. Look for price inflationSome estimates assume electricity prices will rise every year. That may or may not happen, so ask to see the figures with prices held flat.
5. Allow for running costsThe Energy Saving Trust says an inverter needs replacing after around 12 years. A long-run estimate should allow for that, and for a battery replacement if you have one.
6. Compare with an independent figureIf one installer's savings are far higher than another's for a similar system, ask them to explain the difference in writing.

Paying for solar: finance, loans and supplier packages

Most homeowners pay from savings, but there are other routes. GOV.UK's Warm Homes Loan Scheme factsheet (27 October 2026) says the government-backed scheme offers no and low interest loans for clean energy technology, including solar panels and batteries, through approved lenders. It gives up to £15,000 for solar panels, and installations must be carried out by an MCS-certified installer. Check the current terms on GOV.UK or with the lender, as schemes change.

Several energy suppliers now install solar panels and batteries, some with instalment plans or preferential export rates for their own customers. These can be worth comparing alongside local installers, but read the conditions, such as whether the better export rate requires you to buy your electricity from the same supplier.

• Compare the total amount repayable on any finance, not just the monthly payment.
• Check whether the system price changes if you pay in cash.
• Make sure the installer is MCS certified whichever route you use, because export payments and many loans depend on it.

Get quotes from local solar and battery installers

When you're ready, describe your project once and we'll pass it to vetted solar and battery installers who cover your part of Kent. They quote you directly, and nothing is booked until you accept.

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Sources

• Energy Saving Trust: Solar panels, costs, savings and benefits (updated October 2026): energysavingtrust.org.uk/advice/solar-panels/
• Energy Saving Trust: Battery storage (updated October 2026): energysavingtrust.org.uk/advice/battery-storage/
• Energy Saving Trust: Rooftop solar panel installation, step-by-step guide (October 2026): energysavingtrust.org.uk/solar-panel-installation/
• GOV.UK, Department for Energy Security and Net Zero: Solar PV cost data, 2025-26 (May 2026): www.gov.uk/government/statistics/solar-pv-cost-data
• GOV.UK: Warm Homes Loan Scheme factsheet (27 October 2026): www.gov.uk/government/news/warm-homes-loan-scheme-factsheet
• MCS: Battery storage for consumers: mcscertified.com/consumers/technologies/battery-storage/
• GOV.UK, HMRC: VAT Notice 708/6, energy-saving materials and heating equipment: www.gov.uk/guidance/vat-on-energy-saving-materials-and-heating-equipment-notice-7086
• MCS: MIS 3002 Solar PV Systems standard, issue 6.0 (March 2026): mcscertified.com/wp-content/uploads/2026/03/MIS-3002_Solar-PV-Systems-V6.0-Final.pdf
• MCS: Customer Commitment, issue 1.1 (September 2026): mcscertified.com/wp-content/uploads/2026/09/MCS-Customer-Commitment_V1.1_2026.pdf