A home battery stores cheap off-peak or solar electricity for use later. The right one depends on how much energy you use in the evening, whether you already have solar panels, and which inverter you have. Specs below are taken from each manufacturer’s datasheet.
| Product | Usable capacity | Continuous power | Type | Warranty |
|---|---|---|---|---|
| Tesla Powerwall 3 | 13.5 kWh | Up to 11.04 kW | Battery + solar inverter | 10 years |
| GivEnergy All in One | 13.5 kWh | 6 kW (7.2 kW peak) | AC-coupled | 12 years |
| Enphase IQ Battery 5P | 5.0 kWh per unit | 3.2 kVA per unit | AC-coupled | 15 years / 6,000 cycles |
| SolarEdge Home Battery 48V | 4.6 kWh per module (up to 23 kWh) | 5 kW (multiple modules) | DC-coupled | 10 years |
| Fox ESS EP11 | ≈9.3 kWh (10.36 kWh nominal, 90% DoD) | Depends on Fox inverter | DC (Fox ESS hybrid inverters) | Ask installer |
An all-in-one battery with a built-in solar inverter, 13.5 kWh of usable storage and configurable output up to 11.04 kW in the UK.
Suited to: New solar-plus-battery installs that want one unit for battery and inverter
Full specs & reviewsA 13.5 kWh AC-coupled battery with a built-in 6 kW inverter, designed to add storage to new or existing homes, with a 12-year warranty.
Suited to: Adding a large battery to a home that already has solar panels
Full specs & reviewsA modular 5 kWh AC-coupled battery with six built-in microinverters, LFP chemistry and a 15-year limited warranty.
Suited to: Homes with Enphase microinverter solar systems
Full specs & reviewsA stackable 4.6 kWh DC-coupled battery module for SolarEdge Home Hub and StorEdge three-phase inverters, expandable to 23 kWh.
Suited to: Homes with (or installing) a compatible SolarEdge three-phase inverter
Full specs & reviewsA 10.36 kWh high-voltage LFP battery for Fox ESS hybrid inverters, expandable to four units in parallel.
Suited to: New solar installs using a Fox ESS hybrid inverter
Full specs & reviewsLook at how many kWh you use between late afternoon and bedtime. A battery much bigger than that, without solar or a time-of-use tariff, may never fill or empty fully.
Compare usable capacity, not nominal. A 10 kWh battery with 90% depth of discharge gives about 9 kWh to use.
Continuous power (kW) decides how many appliances the battery can run at once. An electric shower or oven can draw 7–10 kW.
AC-coupled batteries can be added to almost any existing solar system. DC-coupled batteries pair with a specific hybrid inverter, which is usually best for new solar-plus-battery installs.
Warranties usually guarantee a percentage of capacity after a number of years or a throughput limit, whichever comes first — and some require the battery to stay online.
Get at least three quotes from MCS-certified installers. Home batteries fitted in Great Britain currently qualify for 0% VAT.
Most UK homes are well served by 5–14 kWh of usable storage. Check your smart meter data for how much you use in the evening and overnight, and size the battery to cover that rather than your whole day.
Yes. An AC-coupled battery (such as the GivEnergy All in One, Tesla Powerwall 3 in AC mode or Enphase IQ Battery 5P) can usually be added to an existing system. DC-coupled batteries need a compatible hybrid inverter.
It can be if you are on a time-of-use tariff: the battery charges on cheap overnight rates and powers your home during expensive peak hours. The saving depends on the gap between your off-peak and peak prices.
Only if the system includes backup hardware (such as a gateway or EPS output) and is installed for backup. Many batteries do not provide backup by default — ask your installer.
Specifications come from manufacturer datasheets, checked 4 November 2026. We have not lab-tested these products and don’t give them scores; ratings shown are from moderated customer reviews only. We are not paid by manufacturers and these pages contain no affiliate links. How we compare products.