Solar Battery Prices: How Much Does Solar Battery Cost in the UK?
As more UK households shift toward renewable energy, the solar battery storage prices have become a major talking point. If you are looking to lower your electricity bills, rely less on the grid, or even live completely off-grid, understanding the pricing is an important first step. In this blog, we will explore the average UK solar battery prices in 2025, explain the factors that affect pricing, show how much you could save, and help you figure out the right size for your needs. Let’s dive in.
Average Solar Battery Prices in the UK
The average cost of solar batteries in the UK varies significantly based on capacity, brand, and whether it's installed with a new solar panel system or added to an existing one. Obviously, adding a battery to an existing system will likely be more expensive due to additional labor and potential inverter upgrades. Here's a general overview.
Average Costs (Including Installation):
Small (3-5 kWh): £2,500 - £5,000
Medium (9-10 kWh): £4,500 - £9,500
Large (15+ kWh): £7,000 - £10,000+
Cost per kWh: The price per kWh of storage generally ranges from £265 to £415.
For a typical three-bedroom house, a 5 to 10 kWh battery is usually a good fit, with costs ranging from around £4,000 to £9,500 when installed alongside a solar panel system. To lower the upfront cost and still enjoy the benefits of solar energy, installing a solar generator is a smart move. A solar generator combines solar panels, a battery, and an inverter into one integrated system, which can help reduce overall expenses by simplifying installation and equipment setup.
What Factors Affect the Cost of a Solar Battery?
It is important to understand what you’re paying for before investing in a solar battery. Here's a breakdown of the most significant elements that affect the solar battery storage prices.
Battery Capacity (kWh): The most obvious factor is how much energy the battery can store. Larger batteries with higher kilowatt-hour (kWh) capacity cost more but can store more power, which is ideal for bigger homes or users looking for longer backup during power outages.
Battery Type: So far, lead-acid and Lithium-ion batteries (like LiFePO4) are the two mainstream ones in the market. As a traditional type, lead-acid solar batteries are cheaper but require more maintenance and have shorter lifespans. Lithium-ion batteries are more expensive upfront but have longer lifespans, higher efficiency, and faster charging times.
Depth of Discharge (DoD): A higher DoD means you can use more of the battery’s stored energy. This adds to usability and value greatly. Therefore, batteries with better DoD typically cost more but deliver better performance over time.
Cycle Life & Warranty: The more charge-discharge cycles a battery supports, the longer it lasts. Longer-lasting batteries often come with better warranties—and higher prices. Consider this a long-term investment metric.
Brand & Integration Features: Premium brands offering smart monitoring systems, seamless inverter integration, or compatibility with solar systems often charge more for their reliability, safety, and convenience.
Installation Costs: The professional installation, including inverters and other equipment, can significantly add to the final price. The costs also vary if you’re trying to upgrade an existing system.
What Size Solar Battery Do You Need?
You should determine the right size solar battery hinges on your energy needs, goals, and your solar panel system's output. Below are breakdowns of how to choose the proper size for your needs.
Step 1: Check Daily Usage
Start by calculating your daily energy consumption in kilowatt-hours (kWh). Review your electricity bills to find your monthly usage and divide by the number of days in the month. For example, the average UK household consumes around 8-10 kWh per day.
Step 2: List Essential Loads
Next, consider what you want to power during a blackout or off-grid. List essential appliances and their wattage, then estimate how many hours you'd need to run them. Multiply wattage by hours and divide by 1000 to get kWh. For instance, running a 100W light for 5 hours consumes 0.5 kWh. Sum the kWh for all desired appliances to estimate your backup energy needs.
Step 3: Match Battery Capacity
hen, you should aim for a battery with usable capacity that meets or exceeds your calculated needs. Note that batteries have a depth of discharge (DoD), indicating the percentage you can safely use. Lithium-ion batteries often have a higher DoD (around 80-90%) compared to lead-acid (around 50%). So, if you need 5 kWh of usable energy and choose a battery with 80% DoD, you'd need a battery with a total capacity of 6.25 kWh (5 / 0.80).
Typically, a 5-kWh solar battery is suitable for small homes or light usage, and a 10 kWh one can run a UK household for a whole day on average. For bigger homes or near-off-grid living, consider a 15+ kWh solar battery.
Bonus Tips: If you are looking for a flexible solution that can grow with your energy needs, the EcoFlow DELTA Pro 3 Portable Power Station is a smart choice. With an expandable capacity ranging from 4 kWh to 12 kWh, it can easily adapt to different household demands. It also offers strong output power, up to 4000W, or even 6000W in X-Boost Mode, enough to handle everything from everyday appliances to heavy-duty equipment without constant unplugging. Its dual-port solar charge input makes it especially convenient for homes that already have solar panels installed, offering more flexibility for charging setups.
How Much Money Can You Save With a Solar Battery?
The amount you save depends on several factors, including your household's energy consumption, the size of your solar panel system, and the capacity of the battery installed. For instance, a medium-sized household with a 10 kWh solar battery might see annual savings of about £800, with a payback period of approximately seven years
On average, households with solar panels but without battery storage save approximately £380 per year. However, by adding a solar battery, these savings can increase to around £840 annually, effectively more than doubling the benefit.
Better still, utilizing time-of-use tariffs can enhance these savings. The electricity rates vary from time to time during the day. By charging the battery during off-peak hours and using the stored energy during peak hours, you can further reduce the energy costs. Some estimates suggest that this strategy can save households an additional £550 per year.
Is a Solar Battery Worth It?
Investing in a solar battery is a prudent decision, especially for households aiming to maximize their solar energy usage and reduce electricity bills. Here's an overview to help determine if it's worth it.
Financial Considerations: As of 2025, solar battery prices in the UK range between £2,500 and £10,000, depending on capacity and technology. When combined with solar panels, a typical three-bedroom home could save approximately £582 annually, with the battery contributing around £130 of that saving. The payback period for such an investment averages 7 to 12 years, influenced by factors like energy consumption, battery size, and tariff rates.
Energy Independence & Efficiency: Solar batteries allow homeowners to store excess energy generated during the day for use during peak hours or at night. It is where most of the electricity bills are saved. This not only helps to reduce reliance on the grid but also ensures a consistent power supply during outages. The longer you rely on solar batteries, the better the value of your investment will be.
Environmental Impact: Storing and using solar energy during non-sunlight hours ensures that less fossil-fuel-based electricity is consumed. This is a great way to reduce their carbon footprint and contribute to a greener environment. If you are an advocate of environmentalism, then a solar battery is worth the money.
While the initial investment is substantial, the long-term savings, increased energy independence, and environmental benefits make solar batteries a worthy consideration. You can evaluate your energy usage patterns, budgets, and other purposes for an informed decision.
Conclusion
Understanding solar battery prices is key when planning your move toward greater energy independence. By choosing the right size and setup, you can increase your savings and reduce your reliance on the grid. Finding the best solar battery storage UK options helps you store more solar power and use it when it matters most. For those looking for flexible and dependable energy solutions, EcoFlow offers a wide range of choices to support your solar journey.
FAQs
What is the average cost of a solar battery?
Generally, you can expect to pay between £2,500 and £10,000. For a typical 5 kWh battery suitable for a 3-bedroom house, the average cost is around £3,500 to £5,000 if installed with solar panels, but can be closer to £5,000 if added later.
How much does a 5 kW solar battery cost in the UK?
A 5 kWh solar battery usually costs between £3,500 and £5,000, including installation, when paired with a new solar panel system. If you are adding it to an existing solar setup, the price can be higher, often around £5,000, because of extra labor and possible inverter upgrades.
How long do solar batteries last?
The lifespan of solar batteries usually ranges from 5 to 15 years, depending on several factors. Cycle frequency, depth of discharge (DoD), temperature, and maintenance all play a role in how long a battery lasts. In general, lithium-ion batteries offer a longer lifespan of 10 to 15 years, while lead-acid batteries tend to last around 3 to 7 years.
How much does a 10kW solar battery cost in the UK?
The cost of a 10 kWh solar battery in the UK typically ranges from £5,000 to £7,500, including installation when fitted with a new solar panel system. When adding it to an existing solar setup, the cost could be closer to £7,000 or more.