A solar storage battery stores surplus electricity from your solar panels. You then use this stored energy later, for example in the evening or at night. A battery can also supply backup power during a power cut if the system supports it.
You connect the battery to your solar inverter or to a separate battery inverter. A control unit manages charging, discharging, and protection. The full setup is often called a solar‑plus‑storage system.
Solar battery cost varies for several key reasons:
Capacity (kWh): Larger batteries store more energy and cost more. Price often scales with size, but bigger units can have a lower cost per kWh.
Power rating (kW): This is how fast the battery can deliver power. Higher power ratings can add to cost.
Chemistry: Most home batteries use lithium‑ion. Within that, lithium iron phosphate (LFP) versions often offer long life and strong safety, which may change price.
Brand and warranty: Well known brands with long warranties often charge more. A longer warranty can give you better value over the battery life.
Installation setup: Costs can rise if you need a new inverter, switchgear, or wiring changes.
Use case: You might pay more for backup power, smart controls, or seamless integration with an EV charger or heat pump.
You should focus on cost per kWh of capacity and cost per kWh of energy you expect to use over the battery life. These figures show value more clearly than headline price alone.
Battery prices move with supply chains and demand, so exact figures change. These UK price ranges are common as of recent years and give you a useful guide.
Most home systems now use lithium‑ion batteries. Lead‑acid is rare for grid‑connected homes, as it is larger, heavier, and less efficient.
Typical lithium‑ion home battery prices (supply only):
Small (3–5 kWh): roughly £2,000–£4,000
Medium (7–10 kWh): roughly £3,500–£7,000
Large (10–15 kWh+): roughly £6,000–£10,000+
Cost per kWh of capacity often falls as size increases. For example:
A 5 kWh unit at £3,000 = £600 per kWh
A 10 kWh unit at £5,500 = £550 per kWh
Higher‑end systems with long warranties, strong brand names, or modular designs can sit above these ranges.
Most UK homes choose batteries in the 5–10 kWh range. This often matches a solar array of 3–6 kWp.
Typical installed prices for solar‑plus‑battery systems:
3–4 kWp solar + 5 kWh battery: around £7,000–£10,000
4–6 kWp solar + 8–10 kWh battery: around £9,000–£14,000
For a battery added to existing solar:
5–10 kWh battery retrofit: often £3,500–£8,000 installed, depending on inverter needs and complexity.
Prices depend on your roof, your location, chosen kit, and installer rates.
You can install a battery on its own without solar panels. This is a standalone battery system. You charge it from the grid at low tariff times and use it at peak times.
Standalone batteries: you pay for the battery, inverter (if you need one), and full install work. Savings come from tariff shifts and backup power, not from solar.
Solar‑plus‑storage systems: you gain savings from both solar generation and battery storage. Upfront cost is higher, but long‑term savings can be larger.
If you already have solar, adding a battery later can spread cost. If you plan both, a combined install is often cheaper and neater than two separate projects.
Answer a few quick questions, and we will send you a bespoke solar panel quote.
Upfront cost answers most of your question: how much do solar storage batteries cost today? You should break this into clear parts.
Core equipment items are:
Battery pack: this is the main cost. As above, a 5–10 kWh lithium‑ion unit will often sit between £2,000 and £7,000 supply only.
Hybrid inverter or battery inverter: if you install solar and battery together, you often use a hybrid inverter that handles both panels and battery. If you add a battery to an older solar system, you may need a separate battery inverter. Inverters often cost £800–£2,000.
Control and safety hardware: this can include a gateway, isolators, fuses, changeover switches, and a consumer unit upgrade. Costs vary but often add £300–£1,000.
For some brands, you buy an all‑in‑one unit that houses battery cells, inverter, and controls together. Others are modular, with separate wall‑mounted parts.
Labour and install extras can add a large share of total cost. Key items include:
Labour: survey, design, mounting, wiring, testing, and setup. For a home battery this can be £800–£2,000, more if the job is complex.
Electrical upgrades: you may need a new consumer unit, main fuse upgrade, or extra cabling. This can add a few hundred pounds.
Scaffolding: if you install solar panels at the same time, scaffolding is often needed. This can add £500–£1,000+, but it is usually shared with the solar side.
Paperwork and sign‑off: installers must comply with UK standards and notify your Distribution Network Operator (DNO). These tasks sit inside the quoted install price.
Ask installers to split labour and materials on quotes. This helps you compare offers fairly.
Certain extras can add value and modest cost:
Energy monitoring: many systems include a basic app at no extra fee. Some add paid advanced analytics.
Backup circuits: you can add a backed‑up consumer unit or manual transfer switch so key circuits (lights, fridge, Wi‑Fi, some sockets) stay live in power cuts. This can add £300–£1,000+ depending on design.
Smart controls and integrations: links to EV chargers, heat pumps, or home automation may need extra hardware and setup time.
You do not need every extra at day one. Some systems are modular, so you can add features later.
Upfront price is only part of the equation. You also need to look at what you save over the battery lifetime and any running costs.
Batteries are not 100% efficient. You lose some energy between charging and discharging.
Typical round‑trip efficiency for lithium‑ion batteries is 85–95%.
Over time, usable capacity falls. Many suppliers promise at least 60–80% of original capacity after 10 years or a set number of cycles.
You may see a warranty such as “10 years or 6,000 cycles to 70% capacity.” This means the maker expects a long life span if you use the system within stated limits.
You should plan for replacement or upgrade after 10–15 years. By that time, energy use patterns and tariffs may also change, so a new system design might suit you better.
Your savings come from three main areas:
Self‑consumption: you use more of your own solar power and buy less from the grid.
Tariff shifting: you charge the battery on cheap off‑peak tariffs and use that energy at peak times.
Export income: you export surplus energy at times that pay more, subject to your Smart Export Guarantee (SEG) and tariff terms.
Time‑of‑use tariffs such as those from some UK suppliers offer very low night rates and higher day rates. A battery lets you shift use across these bands.
Export rates differ by supplier. Some pay a flat rate per kWh exported. Others pay higher rates at peak times. A smart battery can choose to export or store based on these signals.
The higher the gap between cheap and peak tariffs, and the more cycles you run, the more value you can gain.
Answer a few quick questions, and we will send you a bespoke solar panel quote.
UK support schemes change over time. Direct grants for solar batteries are less common than in some countries, but you should still check:
Regional schemes: some local bodies offer support for home energy storage as part of wider retrofit plans.
Tax and VAT: UK VAT rules for energy‑saving materials have eased in recent years. Check if your battery install benefits from a reduced or zero VAT rate when paired with solar.
Financing: some installers offer finance plans or power purchase style deals. These spread upfront cost over several years.
Always compare financed deals with cash purchase over the full term. Look at interest, fees, and what happens if you sell your home.
Now you have a sense of how much solar storage batteries cost, you can focus on picking a system that fits your usage and spend.
Start with your electricity bills and solar output:
Check your daily and evening use in kWh. Look at both winter and summer.
Check your solar array size and expected daily output.
Simple rules of thumb:
For a 3–4 kWp solar array and typical UK home, a 5–7 kWh battery often fits.
For a 4–6 kWp array and higher evening use, an 8–10 kWh battery may work better.
You want a size that often charges fully by mid‑day on bright days and discharges by morning. An over‑sized battery may sit half‑empty and give poor value.
If you plan an EV, heat pump, or home office, factor in future load growth. It may be smart to pick a system that can expand later.
Do not chase the lowest price only. Cheap kit with weak support can cost more in the long run.
Key points to weigh:
Warranty length and terms: look at years, cycles, and remaining capacity. Longer and clearer warranties are worth extra cost.
Supplier track record: established brands and installers are more likely to honour support and parts.
Efficiency and usable capacity: a slightly higher cost but more efficient battery can give more usable energy per kWh stored.
Integration: a system that works cleanly with your inverter, EV charger, and app can save you time and stress.
Calculate a rough cost per warranted kWh. Divide total system price by the number of kWh the warranty expects you to cycle over its life. This helps you compare options.
Before you sign, ask each installer clear questions:
What is the total price, including VAT, labour, and all extras?
What is the battery’s usable capacity in kWh, not just nominal size?
What are the warranty terms for battery, inverter, and labour?
Does the price include any needed consumer unit or DNO upgrades?
Is backup power included, and which circuits will it support?
What app or portal do I use, and are there any ongoing fees?
Can I expand the system later with extra battery modules?
What payback or savings do you expect under my current tariff, and what assumptions do you use?
Ask for each quote in a clear itemised format. This lets you compare kWh size, brand, warranty, and price across several offers.
In the UK, a typical home solar storage battery (5–10 kWh) usually costs around £2,000–£7,000 for the battery alone. Fully installed, including inverter and labour, you might pay roughly £3,500–£8,000 for a retrofit, or £7,000–£14,000 for a full solar-plus-battery system.
Solar battery costs vary with capacity (kWh), power rating (kW), battery chemistry, brand, and warranty length. Installation complexity, need for a new inverter, electrical upgrades, and extras such as backup circuits or smart controls also influence the final price you pay for a complete system.
For lithium-ion home batteries, smaller 3–5 kWh units often cost £2,000–£4,000, while 7–10 kWh systems are around £3,500–£7,000. This equates to roughly £550–£600 per kWh of capacity, with larger batteries usually offering a slightly lower cost per kWh than smaller ones.
Yes, standalone batteries can still be worthwhile if you have a time-of-use tariff. You charge from the grid at cheap off‑peak rates and use the stored energy at peak times. Savings come from tariff shifting and backup power, not from solar generation, so payback depends heavily on tariff differences.
Most modern lithium‑ion solar storage batteries are designed to last about 10–15 years. Warranties commonly promise 60–80% of original capacity after around 10 years or a set number of cycles, such as 6,000. After this period, performance declines and a replacement or system upgrade is usually sensible.
Start with your daily and evening electricity use and your solar array size. Aim for a battery that regularly charges and discharges fully, typically 5–7 kWh for a 3–4 kWp array, or 8–10 kWh for 4–6 kWp. Compare cost per warranted kWh, warranty terms, efficiency, and future expandability.
