The home battery brands you will actually be quoted
Clearline sells no hardware, holds no manufacturer accreditation, and takes no position on which brand belongs on your wall. Every figure below is from the manufacturer's own datasheet or product page, dated where it appears.
Seven systems, the same set of numbers
Where a manufacturer does not publish a figure, the cell says so instead of guessing.
| System | Usable capacity | Power in and out | Warranty | Inverter built in |
|---|---|---|---|---|
| Tesla Powerwall 3 | 13.5 kWh | Up to 11.04 kW on grid and in backup | 10 years, 80% of original usable capacity retained at 10 years in the UK | Yes, integrated, 3 MPPTs, 97.5% solar to grid |
| Duracell Energy Dura16 LV | 14.4 kWh out of a 16 kWh module | 6.6 kW, 130 A charge and discharge | 10 years, 8,000 cycles, 100 MWh throughput; retained capacity not published | No, needs a compatible hybrid inverter |
| Fox ESS EQ5000 | 9.84 to 29.52 kWh across 2 to 6 modules, at 90% depth of discharge | 50 A max, 65 A peak for 60 seconds | 12 years on the UK EQ range page; not stated on the datasheet | No |
| Sunsynk L5.3 | 4.79 kWh out of a 5.32 kWh module, at 90% depth of discharge | 100 A max, 50 A recommended, 150 A peak | 10 years or 16 MWh throughput at 70% end of life, whichever first | No |
| SolaX T-BAT-SYS-HV-S3.6 | 6.6 to 43.1 kWh across 2 to 13 modules, at 90% depth of discharge | 5.1 to 33.2 kW, rising with modules | Not stated on the datasheet | No, pairs with a SolaX hybrid inverter |
| Sigenergy SigenStor | 5.84 kWh per BAT 6.0 module, 8.76 kWh per BAT 10.0 | 3.0 to 4.6 kW per module; controller 3.0 to 12.0 kW | 10 years, 60% of usable energy retained or a minimum throughput | Yes, Sigen Energy Controller |
| Enphase IQ Battery 5P | 5 kWh usable | Not published in the documents we could reach | 15 years or 6,000 cycles, whichever comes first, the longest headline term found | Not published in the documents we could reach |
Read from each manufacturer's own UK datasheet or product page. Ranges are wide and revisions change: your own quote names one exact model, so ask for the datasheet for that model. Two of these seven, the Powerwall 3 and the Dura16, are the packages Clearline arranges installation for; the rest are named for factual comparison only, not as an offer.
GivEnergy, and myenergi Libbi
GivEnergy: rise and fall, not a current option
For much of the early 2020s GivEnergy was one of the best known names in UK home batteries, British headquartered and fitted in large numbers. GivEnergy Ltd entered administration on 9 April 2026 and ceased trading, with unsecured creditors owed over £17,000,000 and no buyer confirmed as of late May 2026. Its datasheets went with the business, which is why it has no row in the table above: a warranty is only worth the company standing behind it, and GivEnergy's 12-year term, on paper one of the stronger ones on the market, was void within three years of being introduced.
myenergi Libbi
myenergi's Libbi is a newer modular battery in the UK market. We do not yet have a verified UK datasheet to place it on the same numbers as the seven above, so it is named here rather than scored, and we would rather say that plainly than guess at a spec.
A verdict per household type
High evening load, an EV, new solar together
The Powerwall 3 case. The integrated inverter removes a box and a failure point, and the power headroom means nothing trips when the car, the oven and the shower coincide.
A quiet house, 6 to 7 kWh after dark
Do not buy the power you will not use. The Dura16's 14.4 kWh usable in one box, or a single modular battery module, covers this without paying for headroom that never gets used.
Wants to add capacity later
Fox ESS, Sunsynk, SolaX and Sigenergy are all modular: buy one module now and add more later without replacing what is already on the wall.
Adding storage to existing solar
An AC-coupled retrofit keeps a working solar inverter in place. Whether that means a battery-only product or an integrated system is exactly what a design call works through.
The two you can get through Clearline, installed
Every installation is carried out by teams holding:
What sits inside the price
Cost per usable kWh is the right first comparison and a poor last one: it ignores power rating, warranty floor and backup hardware. See what a home battery costs, and what moves the number →
Best home battery questions, answered
Which home battery is best in the UK?
There is no single answer, and any page that gives you one is selling something. The Tesla Powerwall 3 leads on continuous power at up to 11.04 kW with an integrated solar inverter. The Duracell Dura16 gives the most usable capacity in one box at 14.4 kWh. Fox ESS, SolaX, Sunsynk and Sigenergy are modular, so you buy in smaller steps and add later. Match the power rating to what your house draws at once and the capacity to your evening usage, then compare cost per usable kWh.
What is the difference between usable and nameplate battery capacity?
Nameplate is the energy in the cells; usable is what the battery management system actually lets you take out, because a reserve is held back to protect cell life. Sunsynk publishes 5.32 kWh nominal and 4.79 kWh usable on the L5.3. Duracell publishes 16 kWh and 14.4 kWh on the Dura16. Sigenergy runs its modules at 100% depth of discharge, so the gap is small. Always price the usable figure, never the number on the box.
Do I need a battery with a built-in inverter?
Not necessarily, and it is a trade rather than an upgrade. An integrated system such as the Powerwall 3 or Sigenergy SigenStor means fewer components and one warranty. A battery-only product such as the Dura16, Sunsynk L5.3, SolaX T-BAT or Fox ESS EQ pairs with a separate hybrid inverter, which can be replaced independently when it fails.
How many kW does a home battery need to deliver?
Enough to cover what runs at the same time on a winter evening. A single Powerwall 3 delivers up to 11.04 kW, a Dura16 6.6 kW, and a single modular battery module around 3 kW with more added per module. If the battery's continuous output is below your simultaneous load, the shortfall is imported from the grid at the full unit rate no matter how much capacity is sitting unused.
Should I avoid a brand because another manufacturer went under?
Avoid the assumption that the manufacturer warranty is your only protection instead. GivEnergy Ltd entered administration on 9 April 2026 and ceased trading, and no further hardware warranties are honoured by it, which left owners relying on their installation team instead. That is a reason to check the installation team’s own workmanship guarantee, whether it is insurance backed, and who the insurer is, on every quote from every brand.
Get your free quote
Takes about two minutes. We work out your options, then confirm your free remote design call, on video, at a time that suits you. It starts with your roof and your numbers, and the design is built around them rather than around a product someone needs to shift.