Best batteries for solar power storage

Which are the best batteries for solar power storage? We look at the available options, prices and efficiencies.
As more UK homeowners embrace solar energy, the demand for batteries for solar power storage is on the rise. Batteries enable you to make the most of your solar panels, storing excess energy generated during sunny hours for use at night or on cloudy days. Here’s a review of some of the best batteries for solar energy available in the UK, each offering unique benefits to suit different needs.
Five of the best batteries for solar power storage
1. Tesla Powerwall 2

Capacity: 13.5 kWh
Efficiency: 90% round-trip efficiency
Warranty: 10 years
Best For: High-capacity storage and smart home integration
The Tesla Powerwall 2 is one of the most popular and powerful home batteries available. With its large 13.5 kWh capacity, the Powerwall can cover nearly a full day of electricity needs for the average UK household. It also integrates seamlessly with Tesla’s app, allowing you to monitor energy usage, control charging times, and even detect power outages in real time. The Powerwall is designed to work efficiently with solar panels, and its 10-year warranty ensures reliability. Though on the premium end of the price range, it’s an ideal choice for those looking for a high-capacity, smart solution.
Find out more and get a quote via the Tesla website.
2. LG Chem RESU

Capacity: 9.8 kWh
Efficiency: 94.5%
Warranty: 10 years
Best For: Flexible capacity and compact design
The LG Chem RESU is a compact and versatile battery available in various sizes, with the 9.8 kWh version being ideal for UK homeowners. Known for its reliability and efficiency, the LG Chem RESU has a slim design that allows it to fit easily in garages or utility rooms. With its high round-trip efficiency, it ensures minimal energy loss, which translates to more stored energy for you. The RESU’s modular design is compatible with different inverters, making it easy to integrate into existing solar setups. It’s a strong contender for those looking for efficient, flexible storage in a more compact size.
Find out more and get a quote via the LG website.
3. Huawei LUNA2000

Capacity: Modular, starting at 5 kWh up to 15 kWh
Efficiency: 97%
Warranty: 10 years
Best For: Modular design for scalable storage needs
The Huawei LUNA2000 is a versatile, modular solar battery system that offers scalable storage, starting with a 5 kWh unit that can be expanded up to 15 kWh. This flexibility is ideal for those who may want to start with a smaller capacity and expand later. The LUNA2000 boasts an impressive 97% efficiency, ensuring that almost all of your generated solar power is usable. The system also integrates with Huawei’s FusionSolar app, allowing users to monitor and control their energy use. It’s a great choice for households looking for a scalable and future-proof storage solution.
Find out more and get a quote via the Huawei website.
4. Sonnen Eco

Capacity: 2.5 kWh – 15 kWh, modular
Efficiency: 89%–94%
Warranty: 10 years
Best For: Eco-conscious users and community energy sharing
Sonnen is known for its sustainability-focused design and its contribution to energy-sharing communities. The Sonnen Eco is a modular battery available in various capacities up to 15 kWh, making it suitable for households with both modest and larger storage needs. This system also allows users to participate in energy-sharing networks, meaning you can share excess energy with other Sonnen users, creating a local energy-sharing ecosystem. It’s a solid option for those looking to combine eco-friendly practices with innovative storage technology.
Find out more and get a quote via the Sonnen website.
5. Enphase Encharge 10

Capacity: 10.5 kWh
Efficiency: 96%
Warranty: 10 years
Best For: Reliable storage with microinverter compatibility
The Enphase Encharge 10 battery is designed to work seamlessly with Enphase microinverters, providing a highly reliable system that works well even in partial shading or in homes with complex roofing structures. With a 10.5 kWh capacity and 96% efficiency, this battery is well-suited to moderate-to-high household electricity needs. Enphase’s monitoring app allows for easy management of energy storage, while the Encharge 10’s durability makes it a strong choice for those focused on long-term investment in energy independence.
Find out more and get a quote via the Enphase website.
Summary – Best batteries for solar power storage
Battery | Capacity | Approximate Price (Including Installation) | Notable Features |
---|---|---|---|
Tesla Powerwall 2 | 13.5 kWh | £8,000–£9,500 | Large capacity, ideal for whole-home use |
LG Chem RESU | 9.8 kWh | £6,000–£7,500 | Compact and flexible integration |
Huawei LUNA2000 | 5-15 kWh, modular | £3,000 per 5 kWh; £6,000–£7,500 for larger setups | Scalable for changing needs |
Sonnen Eco | 2.5-15 kWh, modular | £4,000–£11,000 | Community energy sharing options |
Enphase Encharge 10 | 10.5 kWh | £6,000–£7,500 | Compatible with Enphase microinverters |
Each of these batteries brings something unique to the table. For homeowners looking for maximum capacity, the Tesla Powerwall 2 is the top choice. For those prioritizing flexibility and scalability, Huawei LUNA2000 and Sonnen Eco offer modular systems that can grow with your needs. Finally, LG Chem RESU and Enphase Encharge 10 are ideal for those looking for compact design and inverter compatibility.
Final Thoughts
Solar batteries are an investment that provides energy independence, cost savings, and environmental benefits. Choosing the right battery for your solar PV system can transform how you use and store solar energy, giving you more control over your energy and helping to reduce reliance on the grid.
If you can’t afford a solar battery check out the range of solar power diverters available, which can help maximise your savings from solar energy at a far lower price point.