Battery storage has become a standard part of a UK solar installation, because it lets you use the electricity your panels make instead of exporting most of it for a few pence. This guide compares seven batteries you'll see on UK quotes in 2026, using the figures from each manufacturer's own datasheet, so you can match one to your home and your inverter.
For prices, see our solar battery cost guide.
Why Solar Batteries Matter
Solar panels produce most of their electricity in the middle of the day, while most homes use most of theirs in the morning and evening. A battery stores the daytime surplus so you can use it once the panels have gone quiet. Many households also charge the battery from the grid overnight on a cheap off-peak tariff, and a system wired for backup can keep essential circuits running in a power cut.
Top Solar Batteries for 2026
1. Tesla Powerwall 3
- Usable capacity: 13.5 kWh
- Power output: up to 11.04 kW continuous, set by the installer from 3.68 kW
- Efficiency: 89% solar to battery to home, 97.5% solar straight to home
- Warranty: 10 years, which needs the Powerwall kept reliably connected to the internet
- Key features: built-in hybrid inverter taking up to 20 kW of solar, up to four units on one system
2. GivEnergy All in One 2
- Capacity: 13.5 kWh
- Power output: 6 kW to 12 kW, depending on the model
- Chemistry: lithium iron phosphate (LiFePO4)
- Warranty: 15 years
- Key features: inverter and battery in one unit from a UK company, expandable with up to two 13.5 kWh expansion batteries (40.5 kWh in total)
3. Sunsynk W5.3
- Capacity: 5.32 kWh (4.79 kWh usable)
- Chemistry: LiFePO4
- Cycle life: 6,000 cycles or more at 90% depth of discharge
- Warranty: ends at the warranty period or 16 MWh of throughput, whichever comes first, so ask for the UK terms in writing
- Key features: wall-mounted module, up to 32 in parallel (170 kWh), pairs with Sunsynk hybrid inverters
4. Fox ESS EP6
- Capacity: 5.76 kWh (about 5.2 kWh usable at 90% depth of discharge)
- Chemistry: LiFePO4
- Efficiency: 95% or better round-trip for the battery pack
- Warranty: ask your installer for the current UK terms
- Key features: high-voltage module, up to four stacked for 23.04 kWh, IP65 rated
5. SolaX T-BAT-SYS-LV D53
- Capacity: 5.3 kWh (4.7 kWh usable at 90% depth of discharge)
- Chemistry: LiFePO4
- Cycle life: more than 6,000 cycles at 90% depth of discharge
- Warranty: 10 years
- Key features: low-voltage module, up to 16 in parallel (85.1 kWh), IP65 rated
6. Enphase IQ Battery 5P
- Usable capacity: 5.0 kWh
- Power output: 3.2 kVA continuous
- Efficiency: 90% AC round-trip (96% DC)
- Chemistry: lithium iron phosphate (LFP)
- Warranty: 15 years or 6,000 cycles, whichever comes first
- Key features: six built-in microinverters, AC-coupled, so it can be added to an existing solar system without changing the inverter
7. BYD Battery-Box Premium HVS
- Usable capacity: 5.12 kWh to 12.8 kWh (two to five 2.56 kWh modules)
- Chemistry: LiFePO4
- Efficiency: 96% or better round-trip
- Warranty: 10 years
- Key features: high-voltage stack, up to three towers in parallel (38.4 kWh)
What CRG Direct Fits Most Often
The batteries we fit most often in 2026 are the Sunsynk W5.3, the SolaX T-BAT and the Fox ESS EP6. Each is a module of around 5 kWh, so we can size the battery to your usage rather than to a fixed product, and add modules later if your needs change. Our guide to adding extra batteries to a solar system explains how that works.
Key Factors to Consider
Storage Capacity
Choose a battery size based on your daily energy consumption and desired backup duration. Most UK homes need 8-12 kWh to meaningfully reduce their reliance on the grid. Homes with an EV or a heat pump often need more. Our guide to choosing the right size solar battery shows how to work it out from your bills.Power Output
This determines how many appliances you can run simultaneously. Higher power output is essential for homes with heat pumps or EV chargers.Battery Chemistry
Almost every home battery sold in the UK in 2026 uses lithium iron phosphate (LFP, also written LiFePO4), a type of lithium-ion battery. It's more stable than the nickel-based lithium-ion chemistry used in many older home batteries, and it lasts thousands of charge cycles.Warranty and Lifespan
Look for a warranty of at least 10 years, then read the small print. Most battery warranties end at the number of years or a set amount of energy through the battery, whichever comes first, and they guarantee a minimum capacity at the end, usually 60% to 80% depending on the brand. Some also need the battery registered or kept online. Our guide to depth of discharge and battery lifespan explains why these numbers matter.Integration and Monitoring
Modern batteries offer smartphone apps, smart home integration, and detailed energy monitoring for optimising usage patterns.Installation Considerations
Professional Installation Required
Use an MCS certified installer. It keeps your system eligible for Smart Export Guarantee payments, and manufacturers' warranties usually depend on a professional installation. Here's what an MCS certified installer is and how to check one.Location Requirements
- Well-ventilated area
- Protection from extreme temperatures
- Easy access for maintenance
- Compliance with fire safety regulations
Where a battery goes in a home is guided by PAS 63100:2024, the British Standards Institution's fire safety specification for home batteries. It favours garages, outbuildings and outside walls over spaces inside the home.
Grid Connection
Your installer has to tell the local Distribution Network Operator (DNO) about the battery. A system up to 3.68 kW per phase is usually notified under G98 after it's fitted. Anything larger needs G99 approval before it's connected, which can add several weeks. See DNO approval for solar panels.Financial Benefits
Energy Bill Savings
Store cheap off-peak electricity or free solar energy for use during expensive peak times.0% VAT Until March 2027
Batteries are zero-rated for VAT until 31 March 2027, whether they're fitted with new solar panels, added to an existing system or installed on their own. From 1 April 2027 the rate is 5%.Protection from Price Rises
The more of your own electricity you use, the less a rise in grid prices affects your bills.Potential Income
Some energy suppliers offer payments for providing grid balancing services with your battery.Making the Right Choice
The best solar battery for your home depends on:
- Your energy consumption patterns
- Existing or planned solar system size
- Budget and expected payback period
- Specific features like backup power or EV charging integration
Get Expert Advice
Choosing the right solar battery is crucial for maximising your renewable energy investment. Our MCS-certified team at CRG Direct can assess your needs and recommend the right battery for your home.
Contact us for a free consultation and find out how a solar battery could reduce your reliance on the grid and lower your energy bills.
Sources
- Tesla, Powerwall 3 datasheet (UK): technical specifications
- GivEnergy, All in One 2: product page
- Sunsynk, W5.3 battery datasheet: datasheet
- Fox ESS, EP6 datasheet: datasheet
- SolaX, T-BAT-SYS-LV D53: product page
- Enphase, IQ Battery 5P datasheet (UK): datasheet
- BYD, Battery-Box Premium HVS datasheet: datasheet
- HMRC, VAT on energy-saving materials (VAT Notice 708/6, batteries zero-rated from 1 February 2024 to 31 March 2027): official guidance
- BSI, PAS 63100:2024: protection against fire of battery energy storage systems for use in dwellings
