Plug-In Battery vs Fixed Home Battery: UK Homeowner Guide
Last reviewed 18 August 2026. If you're choosing between a plug-in battery and a fixed, hardwired home battery, this is the page I wish existed before the product pages got involved. For product options and notification background, start with the UK plug-in batteries guide.
Socket
Typical plug-in connection
Hardwired
Typical fixed battery connection
G98/G99
Check if export-capable
What's actually different?
A plug-in battery is more like an appliance than a home installation. It plugs into a normal socket, charges when electricity is cheap, then discharges into your home when electricity is expensive. If it's battery-only and set up so it doesn't export to the public network, it's mainly a load-shifting device.
A fixed home battery is permanent electrical work. It's usually mounted on a wall or floor, connected through an inverter and protective equipment, then commissioned by an installer. It can store solar electricity, charge from the grid, supply larger loads, and in some designs keep selected circuits running during a power cut.
Plain-English rule
Comparison table
| Feature | Plug-in battery | Fixed home battery |
|---|---|---|
| Installation | Normally placed indoors and plugged into a suitable socket. Some products also use smart meters or clamps. | Installed by an electrician, usually with inverter, protection, and consumer-unit work. |
| Cost | Usually lower upfront. Named products are commonly around £1,000-£1,500+ for 2.5-4.8 kWh. | Usually several thousand pounds. Hardware alone can be about £5,000+ for a large battery, before full installation costs. |
| Capacity | Often 2-5 kWh per unit, with some expandable setups. | Often 5-13.5 kWh per battery, with larger systems available. |
| Portability | Can usually be unplugged and moved, as long as the weight and manual allow it. | Permanent home equipment. Moving it means more electrical work. |
| Regulations/G98 | Battery-only no-export usually avoids G98. Solar/export-capable systems may need G98. | Export-capable inverters normally need G98 or G99, plus compliant electrical installation. |
| Best-for | Renters, flats, smaller homes, and time-of-use tariff shifting. | Homeowners with rooftop solar, high demand, EVs, heat pumps, or backup needs. |
| Limitations | Lower output and less backup capability. New product rules are still settling too. | Higher cost, installer dependency, more disruption, and less flexibility if you move. |
What will it cost you?
Plug-in batteries usually win on upfront cost. Windfall states a £1,000 founder price and £1,200 RRP for a 2.5 kWhproduct. AEG-linked UK listings show about £1,499 for a 4.8 kWh plug-in battery. Pricing for EcoFlow, Anker, BLUETTI, and similar brands depends heavily on what ends up in the basket: battery hardware, solar panels, smart meters, or expansion batteries.
Fixed batteries cost more because you're buying hardware and installation. Tesla currently lists Powerwall 3 hardware from £5,000 without Gateway and £5,975 with Gateway before installer-specific labour and extra electrical work. GivEnergy positions its All in One around a 13.5 kWh usable battery pack. These systems can earn their keep in a high-use home, but they normally need a bigger budget and a proper quote.
Do the simple maths first
What about installation?
Plug-in products are simpler, but simple doesn't mean careless. Use the supplied cable, avoid extension leads, keep ventilation clear, and check weight and placement. Many products use LFP chemistry, but the manual still controls where the battery can safely sit. If the product needs a new circuit, consumer-unit work, or a current clamp installed in a restricted meter area, involve a qualified electrician.
Fixed batteries should be treated like any other electrical installation. The installer should design protection, isolation, cable routes, battery location, inverter settings, and commissioning paperwork. If the system can export, you should expect type-testedinverter evidence and the correct DNO route.
Where the paperwork starts
The legal split isn't simply plug-in versus fixed. It's whether the equipment can operate as generation in parallel with the public electricity network. A battery-only appliance that charges from the grid and discharges only to offset your own demand is different from a solar inverter or hybrid inverter that can push AC electricity back towards the grid.
Plug-in solar in Great Britain has a specific route through changes to the ESQCRand plug/socket rules, but that doesn't make every battery arrangement automatically compliant. If you combine battery storage with plug-in solar, read the plug-in solar UK guide and the G98 notification guide. If you export solar electricity, SEG may matter as well.
Which one would I choose?
Choose a plug-in battery if you rent, live in a flat, expect to move, have modest evening electricity use, or want to test time-of-use savings without turning your home into a project site. It's also the more realistic route where roof access and landlord permission are awkward, or where the installation budget is limited.
Choose a fixed home battery if you own the property, already have rooftop solar, use a lot of electricity in the evening, have an EV or heat pump, or want backup circuits. A fixed system is less flexible, but it can be designed around your whole home rather than one socket-connected appliance.
Avoid the middle-ground mistake