Solar Battery Cost UK: 2026 Guide

What people actually mean by "solar battery cost"

This phrase covers two quite different purchases, and mixing them up is the single biggest reason quotes look wildly inconsistent when you search around. The first is a battery-only install: you already have solar panels (or plan to add a battery independently of solar entirely) and you're paying for the battery unit, inverter/hybrid work, and installation labour alone. The second is a combined solar+battery system: panels, inverter, battery and installation bundled as one job, usually because you're starting from scratch.

Battery-only jobs are cheaper in absolute terms because there's no panel supply, scaffolding, or roof work involved. Combined systems cost more overall but often work out better value per pound spent, because you're sharing groundwork, wiring and the electrician's time across both jobs rather than paying for two separate site visits.

Throughout this guide we'll keep the two clearly separated so you can work out which figure actually applies to your situation.

Battery-only fitted price ranges by size

For a battery added where solar (or just a smart tariff) already exists, typical fitted UK price bands in 2026 are: a 5 kWh battery around £4,000-£5,000; a 10 kWh battery around £6,500-£7,500; and a 13.5 kWh battery around £8,000-£9,000. These are inclusive of the unit, inverter/hybrid work if needed, and standard installation, with 0% VAT applied until 31 March 2027.

Prices vary by brand, warranty length, whether you need a hybrid inverter swap, and how much rewiring or consumer unit work is involved. A straightforward retrofit onto an existing solar inverter with a compatible battery is usually at the cheaper end; a full hybrid inverter replacement pushes towards the top of the range or beyond.

For more detail on what's inside these figures, see our full breakdown at /costs/home-battery-storage-cost.

Combined solar+battery fitted price ranges by system size

Where you're buying panels and a battery together as one project, typical fitted ranges in 2026 look like this: a small system (roughly 3-4 kWp of panels plus a 5 kWh battery) from around £8,000; a typical system (roughly 4-5 kWp plus a 10 kWh battery) around £11,000-£13,000; and a larger system (6 kWp or more plus a 13.5 kWh battery) around £14,000-£17,000.

These are typical fitted ranges covering panels, inverter, battery and installation — not fixed prices. Roof type, scaffolding access, number of storeys, and how far the consumer unit is from the panels can all move the number within (or beyond) these bands.

See /guides/solar-panels-with-battery for more on how the two work together, and /guides/what-size-battery-do-i-need if you're unsure which size fits your household.

What actually drives the price

Usable capacity (kWh) is the headline driver — bigger batteries cost more, though not always in a straight line, since fixed installation costs get spread more thinly on larger units.

Battery chemistry matters too. Most modern home batteries use lithium iron phosphate (LFP), valued for safety and cycle life; older or budget lithium-ion chemistries may be cheaper but typically carry shorter warranties.

Discharge rate (how much power the battery can output at once, in kW) affects whether it can run your whole house including things like an EV charger or induction hob simultaneously — higher discharge ratings usually cost more.

Brand and warranty length are a real factor: a battery with a 10-year warranty from an established manufacturer generally costs more upfront than a shorter-warranty alternative, but may work out cheaper per year of expected life.

Install complexity — consumer unit upgrades, cable runs, awkward mounting locations, or scaffolding — adds labour cost regardless of battery size.

Finally, DNO (Distribution Network Operator) paperwork is often overlooked. Larger installations may need permission or notification to your local network operator before connection, which can add administrative time and occasionally a small cost, though it doesn't usually change the headline battery price.

0% VAT until 31 March 2027 — what qualifies

Home battery storage installed by a VAT-registered installer currently qualifies for 0% VAT, whether fitted alongside solar or added later to an existing system, up to 31 March 2027. This applies to both battery-only retrofits and combined solar+battery installs, provided the work is installed (not just supplied) by the registered installer.

This relief has previously been extended, but nothing is guaranteed beyond the current end date, so if you're weighing up timing, it's worth checking the latest position before committing. Full detail at /grants/battery-storage-0-vat-deadline-2027.

Worked example: is a 10 kWh battery worth it? (EXAMPLE — not guaranteed)

This is an illustrative example only, using round numbers to show the kind of maths involved — not a promise of savings for any specific household. Figures will vary with usage, tariff and actual battery performance.

Take a 10 kWh battery used on an Economy-7-style tariff spread: importing at roughly 8p/kWh off-peak and avoiding roughly 28p/kWh at peak rates, a saving of around 20p for every kWh shifted. Charge the battery overnight and discharge it during the day, cycling it around 340 times a year (accounting for days you don't fully use it), with a round-trip efficiency of around 90%.

That works out to roughly: 10 kWh x 340 cycles x 90% efficiency x 20p/kWh ≈ £610 saved per year. Against a battery-only installed cost of around £7,000, that's a rough payback of 11-12 years on the battery alone, without solar in the mix.

Add solar generation into the same system and payback typically shortens materially, because the battery is also storing free daytime solar energy rather than only shifting cheap overnight import — reducing daytime grid imports on top of the tariff-arbitrage saving above. Try your own numbers at /calculator, and see /tariffs/economy-7 for how the tariff structure behind this example works.

Financing a solar battery

Most households pay for a solar battery either outright or through some form of finance, and both routes are common. Green home loans, offered by some banks and building societies for energy efficiency and low-carbon home improvements, are one option worth researching directly with lenders.

Many installers also offer 0% or low-rate finance plans directly, spreading the cost over an agreed term. We can't quote specific rates here, since they change and vary by installer and your credit profile — always check the current terms and total cost of any finance offer before signing, and compare it against paying upfront where you can.

Battery-only or solar+battery — which should you compare?

If you already have solar panels, get battery-only quotes and compare them against the bands above — there's no need to reprice the panels. If you're starting from nothing, get combined solar+battery quotes, since bundling the work usually costs less than fitting solar now and a battery later as two separate jobs.

Either way, get quotes from a few MCS-certified installers before deciding, and use /quotes to compare like-for-like.