Is a battery worth it in the UK?
A battery makes a better case in Britain than in America — but it still rarely pays for itself on arbitrage alone. The reason it is closer here is the gap between what you pay to import (about 26p) and what you are paid to export (often 12p or less).
Why the UK case is stronger
A typical UK system produces more than the household uses, so most of its output is exported at a rate well below the import price. Every unit a battery lets you keep and use in the evening is worth the difference between those two numbers — currently around 14p per kWh. In the US, where homes consume most of what they generate and net metering often credits exports at full retail, that gap is much smaller or absent.
Where it still does not add up
Batteries are expensive, are typically warranted for around ten years against the panels' twenty-five, and will usually need replacing at least once within the system's life. Include that replacement in any comparison — a battery quote that pays back in year eleven on a ten-year warranty is not really paying back.
The reasons that are not about money
Power cuts, and control. A battery with backup capability keeps essentials running during an outage, which no grid-tied array does on its own. Some suppliers also offer time-of-use tariffs that let you charge cheaply overnight and export during peak evening windows at much higher rates — that changes the arithmetic more than the solar side does, and is worth checking before you buy.
Sunlight figures are our own measurements: the median of roughly 16 suburban rooftop samples per city from Google's Solar API, across 115 UK cities. Electricity price is the Ofgem default tariff cap unit rate, 26.11p/kWh, for 1 July – 30 September 2026 — the cap is reset on 1 October 2026 and will be restated excluding VAT, so this figure has a known expiry. Household usage is Ofgem's Typical Domestic Consumption Value of 2,500 kWh, revised down on 1 July 2026. Export is modelled at a conservative 12p/kWh. Estimates only — not a quote, and not financial advice.
Check a specific UK city
Frequently asked
Do solar batteries pay for themselves in the UK?
Usually not on savings alone, though the case is stronger than in the US. The gap between importing at about 26p and exporting at around 12p is roughly 14p per stored unit. Against battery cost and a ten-year warranty, that rarely clears on arbitrage by itself.
How long do home batteries last in the UK?
Most are warranted for around ten years or a set number of cycles, whichever comes first — noticeably shorter than the panels they support. Expect at least one replacement across the system's life, and include that cost when comparing a battery system against panels alone. Many comparisons quietly omit it.
Can a battery power my house in a power cut?
Only if it is specified for backup, which not all installations are. A standard grid-tied system shuts down during an outage for the safety of engineers working on the network, battery or not. If outage resilience is your reason for buying, say so explicitly when getting quotes.