Best Solar Battery Storage UK: A 2025 Comprehensive Guide
Solar power is now a popular and practical choice for many homes. Adding a solar battery storage system lets you store extra electricity produced during the day, giving you the freedom to use it at night or when the sun isn’t shining.
In this article, we’ll walk you through the best solar battery storage in the UK, looking closely at performance, capacity, and overall value. If you’re aiming to cut your electricity bills, become less dependent on the grid, or simply live more sustainably, you’ll find helpful advice here to choose the right solution for your needs. Let’s get started.
Top 6 Best Solar Battery Storage in the UK
With the rapid development of renewable energy in the UK, the choices for solar battery storage have become increasingly diverse. Below are our top six recommendations for the best battery storage for solar panels UK, selected based on performance, reliability, and value for money.
1. Tesla Powerwall 2
Tesla Powerwall 2 is absolutely one of the best home solar battery storage UK options today. With Tesla's brand strength and technological innovation, the Powerwall 2 is not only stylish in appearance but also very powerful in functionality.
Capacity: Total capacity 14kWh, usable capacity 13.5kWh
Depth of discharge: 100%
Efficiency: 90%
Power output: 5kW continuous / 7kW peak
Backup during power outages: Supported
2. SonnenBatterie 10
From Germany, the SonnenBatterie 10 offers different capacities of 5.5kWh, 11kWh, and 22kWh, suitable for users with different capacity needs, and also provides a 10-year warranty.
Usable capacity: Starting from 5kWh, expandable to up to 20kWh
Depth of discharge: 90%-100%
Efficiency: Up to over 90%
Power output: 3.4kW-4.6kW continuous
Backup during power outages: Supported
3. LG Chem RESU
LG Chem RESU is another very popular choice, with models 10H and 16H available, offering capacities up to 9.6kWh / 16kWh, which can meet the daily electricity needs of an ordinary UK household.
Usable capacity: 9.6kWh / 16kWh options
Depth of discharge: 100%
Efficiency: Approximately 97.5%
Battery Technology: Lithium-ion
4. Powervault 3
If you're looking for a locally manufactured, cost-effective, and highly compatible solar battery, Powervault 3 is definitely worth considering. One of Powervault 3's biggest highlights is that, as an AC-coupled system, it can be installed directly on your home's distribution box, compatible with all existing solar photovoltaic systems.
Total capacity: 4–20kWh
Depth of discharge: 100%
Power output: 4.6–5.5kW continuous output, peak up to 11kW
Battery technology: Lithium polymer
5. Sunsynk L5.1
If you want a flexible, economical, and practical solar battery, Sunsynk L5.1 is definitely worth considering. Sunsynk L5.1 is not only affordable but also compactly designed, making it very suitable for users with limited space at home. Even better, it can operate stably across a wide temperature range (-20°C to 55°C), adapting to the UK's changeable climate.
Total capacity: 51.2kWh
Usable capacity: 4.61kWh
Depth of discharge: 90%
Operating temperature range: -20°C to 55°C
6. EcoFlow DELTA 2 Portable Power Station
For those looking for a flexible and portable best home solar battery storage UK, the EcoFlow DELTA 2 is a standout choice. It's perfect for both home backup and everyday use, with enough power to handle essential appliances during an outage or outdoor adventures. What makes it even better is its expandable design, starting with a 1kWh capacity, you can add the EcoFlow DELTA 2 Max Smart Extra Battery to boost it up to 2,048Wh or even 3,040Wh if needed.
Key features of the EcoFlow DELTA 2 include:
Usable capacity: 1kWh (expandable to 2,048Wh or 3,040Wh)
AC output: 1,800W continuous, up to 2,400W with X-Boost
Battery technology: LFP (LiFePO4) with a long lifespan
Solar charging: Fast recharge with 1x400W or 2x220W portable solar panels
Backup support: EPS function for automatic switch during blackouts
Control: Wi-Fi and Bluetooth remote monitoring via the EcoFlow app
Factors to Consider When Finding the Best Solar Battery
When choosing the best batteries for solar power storage in the UK, it’s important to understand not just their specifications, but also how they fit into a complete solar generator system—typically made up of a portable power station and a solar panel. In this setup, the solar battery plays a key role in storing energy collected during the day for use at night or during outages. To ensure you get the most out of your system, here are the main factors to consider when selecting the best solar battery for solar power storage:
1. Capacity and Power
Capacity shows how much energy a battery can store, usually measured in kilowatt-hours (kWh). The higher the capacity, the more electricity you can store for use during cloudy days or at night.
It’s also worth noting that batteries often list two capacity figures: total capacity and usable capacity. Draining a battery completely can damage it over time, so many manufacturers design batteries to only use a portion of their full storage.
For example, if a 10kWh battery has a usable capacity of 9kWh, that means you can regularly use 90% of its energy without harming the battery.
2. Depth of Discharge and Cycle Life
Depth of Discharge (DoD) tells you how much of the battery’s stored energy you can safely use before needing to recharge it. A higher DoD means you get more usable energy. A 90% DoD on a 10kWh battery lets you tap into 9kWh, offering excellent flexibility.
Cycle life refers to how many charge-and-discharge cycles the battery can handle before its performance starts to decline. A good solar battery usually lasts between 4,000 to 6,000 cycles, meaning it can reliably serve you for many years without major loss in capacity.
3. Warranty
Always check the warranty details before buying. Most high-quality solar batteries offer at least a 10-year warranty, sometimes even more. A strong warranty is a good sign that the brand trusts its product to perform well over time.
Choosing a trusted brand also makes a big difference when it comes to customer service and long-term support.
Is It Worth Getting Solar Battery Storage?
There is no denying that solar battery storage comes with a notable upfront cost. A typical 4–6kWh system usually falls between £3,500 and £7,500, while a larger 12kWh setup could set you back around £9,500 to £10,000. So, with these numbers in mind, is investing in a solar battery really worth it? Let’s take a closer look at the pros and cons.
Advantages of Solar Battery Storage:
Lower Energy Bills: By storing the extra solar power you generate during the day, you can cut down your evening and night-time electricity use. Many households save around £600 each year on their energy bills.
More Energy Independence: Rely less on the grid and protect yourself from rising electricity prices.
Environmental Benefits: Support a cleaner, greener lifestyle by using more of your own renewable energy and reducing your carbon footprint.
Backup Power in Emergencies: Keep essential appliances running during blackouts, giving you greater peace of mind.
Good Long-Term Value: With a lifespan typically between 5 and 15 years, a solar battery can pay for itself over time, especially when combined with Smart Export Guarantee (SEG) payments.
Disadvantages of Solar Battery Storage:
High Upfront Cost: The purchase and installation costs are still quite significant for most households.
Space Requirements: You will need a suitable indoor space for the battery system.
Replacement Costs: Unlike solar panels, batteries may need replacing once or even twice over the full life of a solar setup.
System Compatibility: Not all batteries work with every type of solar panel system, so you need to double-check before buying.
Overall, solar battery storage can be a smart investment if you are looking to save on energy bills, rely less on the grid, and make better use of your solar power. While the upfront cost is quite high, the long-term benefits in savings, backup security, and eco-friendliness often make it worthwhile for many homeowners. For a more affordable and flexible solution, EcoFlow DELTA 2 Portable Power Station offers expandable capacity up to 3kWh, suitable for both portable and home use without the hefty price tag.
Conclusion
Investing in a solar battery storage system not only improves home energy efficiency and reduces electricity bills but also contributes to a more sustainable future. Choosing the best solar battery storage UK allows you to easily achieve energy independence. Take action now and embrace a greener, smarter way of living!
FAQs
How much does a 5kW solar battery cost in the UK?
If you plan to get a 5kW solar battery in the UK, you'll need to budget around £4,000 to £5,000. This price only includes the battery itself, not installation fees or other accessories.
Is a 5kW or 10kW solar battery better?
A 5kW solar battery is sufficient to meet the needs of most households, but if your annual electricity consumption exceeds 5000kWh, a 10kW battery would be more suitable. A 10kW battery can power a typical three-bedroom residence for about 12 hours. Expandable options like the EcoFlow DELTA 2 Max Smart Extra Battery allow you to start with a smaller capacity and upgrade as your energy needs grow—offering a flexible, cost-effective alternative to fixed high-capacity systems.
How long will a 5kWh battery power a house?
It actually depends mainly on your electricity usage. If you only use low-power devices like lights and phone charging, a 5kWh solar battery can last up to 10 hours. But if you have air conditioning, ovens, and electric water heaters running, the battery might only last a few hours.