How much do solar panels with a battery cost in the UK?

A solar panel system with a battery typically costs around £9,000 to £15,000 in the UK. Smaller systems can cost less, while a larger array paired with a premium 10kWh or 13.5kWh battery can exceed £16,000.

The battery usually accounts for roughly £3,500 to £9,500 of the total installed price. Capacity, brand, inverter choice, installation complexity and whether the battery is fitted alongside the panels all affect the final quote.

Adding storage can increase the amount of solar electricity you use at home, but it does not automatically produce a faster financial return. The right comparison is the extra cost of the battery against the extra annual savings it creates.

Solar panels with a battery: typical UK costs

The table below gives practical starting ranges for professionally installed domestic systems. They are indicative market ranges rather than fixed prices or quotations.

| Typical system | Likely household | Indicative installed cost |

| --- | --- | --- |

| 3–4kWp solar + 5kWh battery | Lower electricity use / smaller home | £9,000–£11,500 |

| 4–5kWp solar + 5–8kWh battery | Typical three-bedroom home | £10,500–£14,000 |

| 5–6kWp solar + 10kWh battery | Larger or higher-use household | £13,000–£17,000 |

| 6kWp+ solar + 13.5kWh battery | EV, heat pump or substantial demand | £15,000–£20,000+ |

Panel prices are mainly shaped by array size, roof access and equipment choice, which are covered in our breakdown of [how much solar panels cost in the UK.](/articles/how-much-do-solar-panels-cost)

How much does a solar battery cost?

A home battery is normally priced according to its usable capacity, not simply the capacity printed on the casing. Usable capacity is the amount of electricity the system allows you to store and discharge in normal operation.

| Usable battery capacity | Typical installed price | Often suitable for |

| --- | --- | --- |

| 3–5kWh | £3,500–£5,500 | Lower-use homes or smaller solar arrays |

| 6–8kWh | £5,000–£7,500 | Many average households |

| 9–10kWh | £6,500–£9,500 | Higher consumption, EVs or heat pumps |

| 13–15kWh | £9,000–£13,500+ | Large homes or high evening demand |

Some product-only prices look substantially cheaper. Check whether the advertised amount includes the inverter, mounting equipment, electrical protection, labour, commissioning, monitoring and any network application work.

What is included in the combined price?

Solar panels and mounting system. The number and wattage of panels determine the array size.
Solar inverter or hybrid inverter. A hybrid inverter can manage both the panels and compatible battery storage.
Battery and battery-management system. Quotes should state total capacity, usable capacity and maximum output.
Electrical equipment. This can include isolators, protection devices, cabling, meters and consumer-unit work.
Scaffolding and installation labour. Roof access and complexity can materially change the price.
Commissioning and paperwork. Ask about MCS documentation, warranties, monitoring setup and any DNO notification or application.

Is it cheaper to install solar panels and a battery together?

In most cases, fitting the panels and battery together is cheaper than arranging two separate installations. The same survey, scaffolding visit and electrical work can support both parts of the system, while the installer can select a compatible inverter and battery from the outset.

A battery can still be added later. Depending on the existing system, this may involve an AC-coupled battery, additional protection equipment or a replacement inverter. A simple retrofit may add hundreds of pounds, while complicated electrical work can increase the price further.

What size battery do you need?

A larger battery is not necessarily a better investment. The useful size is the one that reflects the home's real electricity consumption, likely solar surplus and evening demand without leaving expensive capacity unused.

Daily electricity consumption. Look at actual smart-meter or bill data rather than a generic household estimate.
Evening and overnight demand. The battery needs enough usable energy to cover the period when panels are not generating.
Solar generation and export. A battery cannot regularly store surplus electricity that the array does not produce.
Battery output. Capacity tells you how much it stores; output tells you how many appliances it can run at once.
Future demand. An EV, heat pump or home-working pattern may justify expansion capability.

For many ordinary households, approximately 5–10kWh of usable storage is the range worth investigating. The correct figure should come from a consumption and generation model prepared for the property.

How much could solar panels with a battery save?

A battery can increase self-consumption by moving surplus daytime generation into the evening. Electricity discharged from the battery can replace power that would otherwise be bought from the grid, although charging losses mean slightly less energy comes back out than went in.

For context, Ofgem’s average capped electricity unit rate for 1 October to 31 December 2026 is 26.32p per kWh for a standard variable tariff paid by Direct Debit. Actual rates depend on region, tariff and payment method.

Generation changes substantially through the year, so [how much money solar panels can save each month ](/articles/how-much-money-can-solar-panels-save-each-month)depends on the season as well as the household's tariff and consumption pattern.

Solar only vs solar with a battery

This simplified comparison shows why greater annual savings do not always mean a shorter payback period.

| Illustrative example | Solar only | Solar + battery |

| --- | --- | --- |

| Initial installed cost | £8,000 | £12,500 |

| Annual bill saving + export income | £700 | £950 |

| Simple payback | 11.4 years | 13.2 years |

These are illustrative figures, not a forecast for a particular home. Results change with system size, tariff rates, self-consumption, battery cycling, equipment performance and finance costs.

The battery's additional cost can therefore extend the overall [solar panel payback period](/articles/solar-panel-payback-period) even when it increases the household's annual energy savings.

Does a battery always improve the financial return?

Not always. Reducing grid imports is valuable, but the battery itself can add several thousand pounds to the project. Its financial contribution depends on how frequently it cycles and the difference between the import cost it avoids and the export income given up by storing the electricity.

A surplus unit exported to the grid may earn an SEG payment. Storing that unit could instead avoid buying electricity at the retail rate later. The battery's benefit is the difference between those two outcomes after allowing for energy losses, degradation and possible replacement.

Which households benefit most from a battery?

Homes that generate surplus solar electricity during the day but consume more power during the evening.
Households with an EV or heat pump, especially where demand can be scheduled or managed intelligently.
People on time-of-use tariffs who can charge cheaply and avoid more expensive periods, subject to tariff rules.
Households seeking greater grid independence or compatible backup capability during power cuts.
Long-term occupants who expect to remain in the property long enough to receive the benefit.

When might a battery not be worthwhile?

You already use most solar generation as it is produced. There may be little surplus available to store.
Your evening electricity consumption is low. A large battery may sit partly unused.
You receive a particularly strong export rate. Exporting may compete closely with the value of storage.
The proposed battery is oversized. Unused capacity increases cost without producing equivalent savings.
Finance interest is high. The total borrowing cost can overwhelm the additional energy savings.

Installation price, roof performance, electricity use and length of ownership all influence whether [solar panels are worth it](/articles/are-solar-panels-worth-it) for a particular household.

Battery lifespan, warranties and replacement

Many modern home batteries are sold with a warranty of around 10 years. The warranty may promise a minimum retained capacity, a maximum energy throughput, a cycle limit or a combination of these conditions.

Read the detail rather than relying on the headline term. Check the minimum capacity guaranteed at the end of the period, whether registration is required, permitted operating conditions, labour coverage and what happens if the manufacturer or installer stops trading.

Solar panels may continue generating for considerably longer than the original battery. A fair lifetime calculation should therefore include the possibility of battery replacement or reduced storage capacity later in the system’s life.

Do solar batteries qualify for 0% VAT?

Yes, qualifying installations of electrical battery storage in residential accommodation are currently zero-rated for VAT. HMRC guidance covers batteries fitted with solar, retrofitted to an existing microgeneration system and qualifying standalone batteries installed to store grid electricity.

The temporary zero rate is scheduled to run until 31 March 2027, after which the published guidance says the reduced 5% rate will apply. Equipment bought without installation can be treated differently, so check how the supplier has structured the quotation.

Solar battery finance

Finance can make the initial cost easier to manage, but compare the cash price with the total amount repayable. A system described as producing immediate monthly savings can still cost substantially more once interest and fees are included.

Ask for the cash price and financed price separately.
Check the APR, term, arrangement fees and early-repayment rules.
Compare repayments with conservative savings, not the installer’s best-case projection.
Do not assume future electricity-price increases will follow a fixed percentage every year.

What should you compare in battery quotes?

Total installed price, including VAT treatment and any possible extras.
Usable capacity and maximum continuous output.
Battery chemistry, expected degradation and cycle assumptions.
Product, performance and workmanship warranties.
Inverter compatibility and whether the design is AC- or DC-coupled.
Backup capability, including which circuits work during an outage and whether extra equipment is required.
Monitoring, software access and any subscription charges.
Generation, self-consumption and savings assumptions.
Installer credentials, documentation and aftercare.

Are solar panels with a battery worth the cost?

For the right household, yes. Storage is most useful where solar generation would otherwise be exported during the day and electricity bought back from the grid in the evening. It may also provide tariff flexibility, greater energy independence and backup power where the system has been designed for it.

The strongest quote is not necessarily the one with the largest battery. It is the design that uses measured consumption and realistic generation estimates to provide enough storage without adding capacity the household is unlikely to use.

Compare solar panel and battery quotes

A suitable system depends on your roof, electricity consumption and when you use energy. Go Solar Today can match you with vetted, MCS-certified installers covering your area, allowing you to compare real installation prices, battery sizes and projected savings for your home.

Frequently asked questions

How much is a 5kWh solar battery in the UK?

A professionally installed battery with around 5kWh of usable storage commonly costs approximately £3,500 to £5,500. Brand, inverter requirements, location and electrical work can move the final price outside this range.

How much is a 10kWh solar battery?

A 9–10kWh home battery commonly falls around £6,500 to £9,500 installed, although premium systems and complicated retrofits may cost more.

Can I add a battery to existing solar panels?

Usually. An installer must check the existing inverter, electrical design, network arrangements and product compatibility. AC-coupled batteries are commonly used where replacing the solar inverter would not make sense.

Will a solar battery work during a power cut?

Only if the system is designed with suitable backup or emergency-power equipment. Many ordinary grid-connected battery systems shut down or isolate during an outage for safety. Ask which circuits will operate and for how long.

How long does a solar battery last?

Many systems carry warranties of about 10 years, but usable capacity gradually declines with time and cycling. Actual life depends on battery chemistry, temperature, usage, software controls and the warranty’s throughput conditions.

Is a bigger battery always better?

No. An oversized battery can add thousands of pounds while rarely filling or emptying. Size storage using measured consumption, likely solar surplus and future demand.

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Sources and update notes

Figures should be reviewed when market pricing, VAT rules or energy tariffs change. Cost ranges are editorial estimates informed by current UK market examples and are not fixed quotations.

HMRC: Energy-saving materials and heating equipment (VAT Notice 708/6)

Ofgem: Energy price cap, 1 October to 31 December 2026

Energy Saving Trust: Battery storage