Solar Panel Battery

Are you wondering if you should include a home battery with your solar PV panel installation? In this comprehensive guide, the experts at NimbleFins dive into the fundamentals of solar panel batteries, explaining why solar panel systems should include a battery, how a solar battery storage system works, how long solar batteries last and how to determine what size battery you need. Our experts have also researched and ranked the best solar panel batteries, considering storage capacity, depth of discharge, battery cycles, warranty and price. We'll also address the financial aspects, including how much solar panel batteries cost, how much money you can save with a battery and whether or not solar batteries are worth it. By the end of this article, you'll have a clear understanding of how solar batteries can help you get the most out of your solar panel system.

• Why solar panel systems should include a battery
• Solar Battery Cost
  • Cost of Solar Panels and Battery
• Best Solar Battery
  • Most Popular Solar Battery
• How does a solar battery storage system work?
  • What size solar battery do I need?
  • How long do solar batteries last?
• How much can I save with a solar battery?
• Are solar batteries worth it?

The simple reason why solar panel systems should include a solar battery

Peak solar PV generation typically occurs in the middle of the day, from roughly 11 am to 4 pm. But peak household electricity demand occurs at different times of the day, typically around 8am - 10am and again from 5pm - 8pm—when the sun is not shining strongly (if at all!).

Due to this large mismatch (i.e. solar produces the most energy in the middle of the day when it's typically not as needed by a home), a battery can be super useful. A home battery can store up excess unused energy during the sunny hours of the day, when solar panels are kicking out lots of free energy that can't be used up right away by the home. Then, later in the day, this 'free energy' can be drawn from the battery so your home solar panel system can still power your home during peak demand in the evening (even when the sun is down).

Additionally, a battery can be charged overnight on cheap electricity from the grid using a special Time of Use tariff—this cheap grid electricity can help power the home during the morning peak demand hours (e.g. 8am - 10am) before the sun kicks in. But how much do batteries cost?

Solar Battery Cost

A typical home battery installed within a solar panel system costs roughly £500 per kWh, or £2,500 for a 5kWh battery. But batteries prices can vary depending on the quality of the battery, the technology, the installer, and more. And larger installation companies periodically offer discounts (e.g. we recently saw 15% off from one national solar installer, Egg), which can help bring prices down.

Larger batteries cost more, due to their larger storage capacity. In 2026, the importance of storage value is highlighted by predictions of installer data, which are expected to show that typical battery costs now range from £380 to £700 per kWh, with an average cost of £495 per kWh. These prices include installation as part of a new solar panel system.

In 2026, the importance of storage value is highlighted by predictions of market data, which are expected to show that average installed costs have dropped to approximately £495 per kWh. This is largely due to the mass adoption of LFP (Lithium Iron Phosphate) technology and the launch of higher-capacity, more efficient systems like the Tesla Powerwall 3.

Solar Battery Costs (March 2026 Estimates)

Note about installers disclosing battery prices: when you get a solar quote from an installer, they probably won't break down the cost of the battery in the formal quote you receive. But, you can ask what the battery cost is when you speak with them and get your solar panel quote—most of them will arrange a Zoom call as the first point of contact. We think it's good to find out how much they're charging separately for the battery and panels. But keep in mind that if you then Google the cost of the battery, you'll probably see lower prices online—that's because those online prices are typically for the supply of the battery only, without installation. The higher price being charged by the installer includes the installation costs as well.

Cost of Solar Panels and Battery

The cost of solar panels and a battery will vary primarily by installer, manufacturer, and the total capacity of the system. In 2026, the importance of accurate budgeting is highlighted by predictions of market data, which are expected to show that combined systems typically range from £8,000 to over £13,000 depending on your home's energy needs.

Below is a breakdown of estimated costs for common system sizes in 2026. These figures include the full MCS-certified installation, scaffolding, and 0% VAT.

Curious about the real cost of solar panels and a battery? Read our in-depth article on the cost of solar panels that provides factors that influence pricing and the financial implications of going solar. The experts at NimbleFins have considered variables from installer variations to manufacturer differences and system size considerations.

Why the costs have changed

In 2026, while the price of individual solar panels has softened, the total cost for a combined system reflects higher labor rates for electricians and scaffolders. Furthermore, the shift toward higher-capacity batteries (like the 13.5kWh Tesla Powerwall 3 or GivEnergy All-in-One) means that while the "per kWh" price of storage has dropped to an average of £495, the total investment for a "storage-heavy" system has remained stable.

Best Solar Battery

When deciding which solar battery is best for you, take a look at these metrics to start off:

In the table below, we include more information on the batteries we studied to help you compare them, including storage capacity and where they're made.

Best Solar Batteries UK (Updated March 2026)

If you're learning about equipment, you may also want to read our related article on the Best Solar Panels.

Most Popular Solar Battery UK

According to the latest installer sentiment reports (including EUPD Research), GivEnergy has seen a significant surge, now appearing in approximately 42% of surveyed installer portfolios, followed by Tesla (39%) and SolarEdge (31%). SolaX Power also maintains a strong presence at 26%.

The survey further identified GivEnergy as maintaining the highest brand awareness among UK installers for the third year running, followed closely by Tesla and Pylontech. You could say that current market data indicates the five most popular solar home battery brands in the UK are: GivEnergy, Tesla, SolarEdge, SolaX, and Pylontech.

How does a solar battery storage system work?

A solar battery can enable you to use up to 100% of the solar power you generate from your solar panels (or close to it...).

The battery storage system works by storing the excess solar power generation that is not used real-time by a home. Instead of letting that unused energy go to waste (or sold back to the grid at super low SEG rates), it can be stored in a home battery for use later in the day, so you aren't buying (as much) energy from the grid when the sun is down.

Where is the solar battery installed in my home?

It depends! Ideally, a battery is installed as close as possible to the incoming supply (meter) and your distribution panel (fuseboard) at ground level. Some batteries (e.g. Tesla Powerwall and Puredrive) are fully weatherproof, so they can be installed on an outside wall of your home. Otherwise, the battery can be placed in a garage, or even in loft space in the attic. A sheltered, not too hot or cold, location is best. Your solar panel installer will discuss the options available for the best solar and battery installation for your unique home.

Keep in mind that all batteries produce a gentle hum during operation, because they contain a pump and a fan. But a battery shouldn't be any noisier than a refrigerator.

What size solar battery do I need?

A 5kWh home battery is good for around 2,000 kWh/year of electricity to use in your home. The typical (median) home uses around 2,900 kWh of electricity per year, so in most cases a 5kWh battery would be sufficient.

But it really depends on the amount of electricity the home consumes and the size of the solar panel system.

Keep in mind that a larger home battery enables charging from solar panels AND from the grid during the night using a cheap nighttime Time of Use tariff or EV tariff.

The optional home battery for solar does add thousands of pounds to the all-in cost, but enables storage of solar power for use later in the day. This can really be worth the money if you aren't home and using all of the solar-powered electricity as and when it's produced. Why? If you don't use or store unused solar energy in a home battery, that energy is either just lost or it's sent back to the grid earning you poor rates.

That is, you can 'sell' solar power back to the grid, but you can only earn very little, if anything—SEG rates mean you can sell energy back to the grid for only 3-4p/kWh, which is far less than the cost you pay to buy energy from the grid if you need to at some point in the day. Generally speaking, every evening you'd rather be able to draw on stored solar energy from your home battery than draw expensive electricity from the grid.

How long do solar batteries last?

Most solar batteries have a 10-year warranty, but the expert installers we've spoken to tell us they expect solar panel batteries to last 15-16 years.

How long a solar panel battery lasts depends largely on the number of cycles a battery is capable of in its life cycle. For example, a SunSynk 5.32kWh (as used by Effective Home) is capable of 6000 Cycles @ 80% Depth of Discharge (DOD). If the battery is charged up once per day, 6,000 cycles equates to 16.4 years (i.e. 6,000 divided by 365 days per year = 16.4 years).

The PureDrive PureStorage II Hybrid is good for 10,000 cycles, which translates into a whopping 27 years.

How much can I save with a solar battery?

Is a home battery actually cost efficient? How much money can one save you? To get a rough idea of this, we've calculated the 'Potential Annual Electricity Savings' in the table below, which is the estimated annual cost of buying the amount of electricity that can be stored in the battery each day.

In other words, if you could fill up the battery for free using solar power each day, and then you used this power in your home throughout the rest of the day, how much money would you avoid paying for National Grid electricity?

For the Q2 2026 period (April–June), the importance of storing your own solar energy is highlighted by the latest price cap data. Predictions are expected to show that a standard 5.32kWh battery can save approximately £480 per year, while a high-capacity 13.5kWh system could save over £1,200.

(Note, a typical home uses around 8kWh to 10kWh/day of electricity, so a 13.5kWh Tesla Powerwall 3 or GivEnergy All-in-One is best suited for larger households or those with high-demand appliances like heat pumps and EVs).

In the calculations above, we used the cost of electricity of 24.67p/kWh, reflecting the Q2 2026 (April–June) Energy Price Cap. As 2026 has progressed, premium LFP batteries have standardized at 100% Depth of Discharge, which is used for all applicable models in this table.

Ok, so the table above shows you can potentially save hundreds of pounds a year using a home battery with solar. That still doesn't tell us if home batteries are worth the expense—because let's face it, they're expensive.

Are solar batteries worth it?

In 2026, the importance of high self-consumption is highlighted by predictions of energy market data, which are expected to show that typical battery payback periods have shortened to between 3.5 and 7 years due to higher grid electricity costs. This assumes you can fully use and discharge the battery every day (limited by each battery's respective Depth of Discharge %, of course).

Battery Pay Back (March 2026 Estimates)

For smaller households using only 8kWh/day, the payback period for large 13.5kWh batteries would extend to ~9.4 years.

Keep in mind that the median household electricity consumption is 8kWh/day, so many homes wouldn't be able to get full use out of the larger 10kWh batteries. If you can't use the battery in full each day, you effectively increase the pay back time.

Will a home battery last this long? Home batteries have become more reliable, but let's see how long the manufacturers are willing to guarantee their products. Most home batteries are guaranteed for 10 years (e.g. Tesla Powerwall, SolarEdge, SunSynk); GivEnergy guarantees their battery for 12 years. So a battery should last long enough to pay back its initial cost in these scenarios. But if you don't make full use of the battery on a daily basis, it may be more difficult to get your money's worth before the end of the warranty term.

Can I add a solar panel battery later?

Yes, you can add a solar panel battery to a solar panel system at a later date, or you can even add another battery later if you start with just one and decide you could benefit from adding a second one (most popular batteries are modular, meaning you can stack multiple batteries together to increase your energy storage capacity).

But, there will be extra costs involved overall if you choose to split the PV panel installation and the battery installation. In that case, you'll need to hire installers and electricians twice. And you'll need to pay to have the system reconfigured and reprogrammed.

If you're considering buying a solar system now but adding the battery at a later date (perhaps to reduce the upfront costs of buying the solar PV panel system), be sure to tell your installer that you may add a battery later. Why? So they can install a (slightly more expensive) battery-ready hybrid inverter with your initial solar panel setup. That'll save you the cost of buying a brand new one when you add the battery later. A hybrid inverter costs roughly £200 - £300 more than a regular inverter, FYI.

Note on VAT of solar batteries: It used to be that there was a tax advantage to including the battery in the initial install (when they'd be subject to 0% VAT), and a tax disadvantage to installing them later, separately from the panels (when they were charged 5% VAT). However, the law has changed and the 0% VAT treatment is now the same, regardless of if you install independently or with solar panels.

Currently, electrical storage batteries installed in residential accommodation count as zero-rate (i.e. 0% VAT) until 31 March 2027, including:

For further information about the VAT treatment of solar panels and batteries, check out the Gov Solar Battery VAT site.

Methodology

Battery prices can be a bit of a mystery, as installers typically give you one quote for all of the equipment—they tend not to itemise the costs of the individual components. But they'll tell you if you ask specifically. So we first asked some of the big national installers for solar panel system quotes and teased out the prices of the batteries; then updated this pricing with additional research in March 2026.