Yes, you can fit a home battery without solar panels. A battery-only system charges from the grid when electricity is cheap, usually overnight on a time-of-use tariff, and powers your home when electricity is dear. Whether it pays depends on the gap between your cheap and standard rates, how much power you use outside the cheap window, and what the system costs. This guide covers how it works, the real figures, the compatibility checks if you already have solar, and a note for landlords asking about EV chargers.
TL;DR
- A battery without solar buys cheap off-peak electricity and releases it at peak times, so you need a tariff with a real price gap.
- Typical UK costs run from £1,500 to £10,000 depending on size, with a 5kWh system around £4,600, according to the Energy Saving Trust.
- Payback is usually measured in many years, so correct sizing from your own meter data matters more than the headline capacity.
- Adding a battery to existing solar is routine, but inverter type, consumer unit capacity and network notification need checking first.
- Most batteries do not power your home in a blackout unless they are specified and wired for backup.
Table of Contents
- How battery-only storage works
- What does it cost, and does it pay back?
- Is battery-only right for your home?
- Sizing: capacity and power are different things
- Will it keep the lights on in a power cut?
- Adding a battery to existing solar panels
- Perspective
- Our battery and solar service
- A note for landlords: EV chargers at rented properties
- What happens when you ask us for a quote
- FAQ
- Sources
How battery-only storage works
A home battery does not care where its electricity comes from. With solar, it soaks up the surplus you would otherwise export. Without solar, it charges from the grid instead, and the clever part is the timing.
You sign up to a smart time-of-use tariff, which has a low rate for a few hours (often overnight) and a higher rate the rest of the day. The battery fills during the cheap window. When the window ends, it discharges automatically to run your home. The Energy Saving Trust describes the cycle: the system stops charging when full, discharges once the cheap period ends, and stops discharging at a set minimum level (it gives around 20% of capacity as an example), after which you draw from the grid as normal. Its battery storage guidance covers this in more detail.
The government’s Clean Energy campaign page says the same: batteries can be charged directly from the grid, so you can store off-peak electricity for later and avoid buying it at expensive times.
In practice that means:
- The tariff sets the opportunity. No price gap, no saving.
- The battery shifts your use. It moves consumption from expensive hours to cheap ones.
- The inverter and software do the rest. Once configured, you should not need to touch it.
If you are on an Octopus Go style tariff, our guide to setting up a battery on Octopus Go explains how the charging window and the battery schedule need to line up.
What does it cost, and does it pay back?
Start with the price. The Energy Saving Trust gives a range of £1,500 to £10,000 depending on type and size, with a 5kWh system costing around £4,600. It also notes that fitting a battery at the same time as solar panels can reduce cost, because the installers are already on site.
On VAT, the Clean Energy page states that home battery installations are exempt from VAT until 31 March 2027, and that this covers standalone batteries as well as those fitted with an energy-saving device such as solar panels. That date is the scheduled end of the relief, so check the current position on the official battery page before you sign anything.
A worked example
The Centre for Sustainable Energy publishes a battery-only scenario. For a household using 3,500kWh a year, electricity bought at 12p/kWh costs £420 a year, against £914 at a standard tariff of 26.32p/kWh. That is an annual saving of £494, and with a £4,600 battery the simple payback is 9 years. You can read the workings in the Centre for Sustainable Energy’s battery guide.
That example assumes the whole year’s usage runs through the battery, which is generous. A real home uses power at times a battery cannot cover, and the battery loses a little energy in each cycle. As a rough illustration of losses: if a battery is 90% efficient, power bought at 8p costs about 8.9p by the time it is delivered. If your standard rate is 28p, each kWh from the battery saves roughly 19p. Those are our own illustrative numbers, so replace them with your actual rates.
The same Centre for Sustainable Energy page says payback for battery storage generally sits in the region of 8 to 12 years, similar to the expected lifespan. It lists what moves the figure:
- the size and cost of the battery system
- how much electricity you use in the evenings and mornings that the battery could supply
- the price you pay for electricity and whether you are on a time-of-use tariff
- whether you have a heat pump or other electric heating
- for solar homes, how much you would earn exporting under the Smart Export Guarantee instead of charging a battery
If you want to see how those variables play out for real homes, our article on when a home battery can pay back in 8 to 11 years walks through the numbers, and when an installer’s check makes off-peak charging pay covers the tariff side.
Is battery-only right for your home?
Battery-only storage tends to suit homes with a particular profile. Run through these questions.
| Question | Points towards battery-only | Points towards waiting or adding solar |
|---|---|---|
| When do you use most power? | Evenings and early mornings | Mostly daytime, with someone home |
| Do you have a heat pump or electric heating? | Yes, a large load to shift | No, low and flat usage |
| Can you get a cheap overnight rate? | Yes, a wide gap to the standard rate | Only a small gap |
| Is the roof suitable for solar? | No (shade, listed building, rented) | Yes, south-facing and unshaded |
| Do you drive an EV? | Yes, home charging adds to overnight demand | No |
If your roof is suitable, solar plus battery is worth pricing together, because the same visit and the same electrical work serve both. Our piece on how solar plus battery storage cuts night-time import costs explains the difference in how the two setups save money.
Sizing: capacity and power are different things
Two numbers define a battery. Capacity, in kWh, is how much it stores. Power, in kW, is how fast it can charge and discharge. The Centre for Sustainable Energy advises checking capacity against an analysis of your own consumption, and checking the charge and discharge rate against the appliances you want to run.
An oversized battery is the most common way to waste money. If you only use 6kWh between the end of your cheap window and bedtime, a 15kWh unit sits partly empty and you have paid for storage you never use. Twelve months of meter data shows you the real evening and morning demand. We set out the method in sizing a home battery with 12 months of meter data.
Also check:
- Charge window length. A cheap rate of only a few hours has to be long enough to fill the battery at its charge rate.
- Round-trip efficiency. Every battery loses some energy as heat, which narrows your saving.
- Warranty and expected life. Lifespans of around 10 to 12 years are commonly quoted, so compare the warranty term with your payback estimate.
- Smart tariff compatibility. The battery’s controls should be able to follow your supplier’s cheap window.
Will it keep the lights on in a power cut?
Usually not. Most home battery systems are installed to save money and will shut down when the grid fails, for safety reasons. Backup power needs equipment designed for it: a battery or inverter with a backup function, plus wiring that safely separates your home, or chosen circuits, from the grid. That adds cost and design work, including earthing arrangements. If outage protection matters to you, say so at the survey stage. See our guide to EPS backup power for UK homes for what it involves.
Adding a battery to existing solar panels
If you already have solar, you are in a strong position. The battery stores your own surplus rather than relying only on cheap grid power, and you can still charge from the grid on a cheap tariff in winter. A few checks decide whether it is straightforward.
AC or DC coupling
An AC-coupled battery has its own inverter and connects on the AC side of your home wiring, so it can usually be added without touching the existing solar inverter. A DC-coupled system connects to the DC side of a compatible hybrid inverter. If your current inverter is old, a hybrid replacement can sometimes be the tidier answer. Which route is best depends on your inverter’s make, age and location, which an installer must see in person.
Network notification
Battery installations are not a free-for-all on the grid. The Clean Energy page says that you or your installer must inform your Distribution Network Operator (DNO). When a battery is added to a property that already has solar, the combined generating capacity can be higher than the original notification covered, and in that case approval may be needed before the work goes ahead rather than just a notification afterwards. Your installer should work this out and handle the paperwork.
Consumer unit and board capacity
The battery needs a safe place on your electrical board. Sometimes the existing consumer unit has no spare way or the wrong protection, and an upgrade is needed. This is an electrical-contractor job, and it is better to find out at the survey than halfway through the install.
Location and compliance
A battery must sit somewhere suitable, and the finished installation needs the right isolation, labelling and an Electrical Installation Certificate. A reputable installer provides these as standard.
Does the Smart Export Guarantee matter?
If you export solar, MCS certification of the installation is generally needed to receive Smart Export Guarantee payments. A battery-only system exports nothing, so SEG is not part of its economics. For a solar home, the CSE notes that the export rate you could earn is one of the factors that affects battery payback, because every kWh you store is a kWh you do not sell.
For how this works for homes in our area, see our hybrid solar battery guide for Hampshire and real examples of solar battery savings in 2026.
Perspective
Most people who ask us about a battery without solar are really asking one thing: will it pay for itself, and when? Our honest answer starts with data, not a brochure. We look at your meter readings, your tariff options and how your household actually uses power, then size the battery to that.
We also think about the next step. A battery-only install is often the first stage of a wider energy plan. If a solar array or an EV charger is likely in the next few years, we plan the consumer unit, cable routes and inverter choice now so you do not pay to redo the work later.
That is where being a full-service electrical contractor helps. The battery, the board, the testing and the paperwork are handled by one team, and you have one point of contact afterwards.
Simon
Our battery and solar service
We are electrical contractors covering Dorset, Hampshire and Devon, specialising in solar PV, battery storage and EV chargers. We highlight our MCS and NICEIC accreditation, a 4.9 Trustpilot rating, and clear communication from quote to handover.
If you are weighing up a battery with or without panels, start with our solar and battery storage page or get in touch through the main site. Once a system is installed, our Solar & Battery Service & Maintenance Plan is available at £175 per year.
A note for landlords: EV chargers at rented properties
Landlords who ask about batteries often ask about EV charging in the same breath, because both are cheap-rate load shifting. A few practical points:
- Check the electrics first. An EV charger adds a sizeable, long-running load. Before agreeing, the property’s electrical installation should be in good order, with a current inspection report. Our EICR checklist for landlords sets out what to have in place.
- Have the supply assessed. The consumer unit and incoming supply must cope with the extra load, and the charger needs its own dedicated circuit with suitable protection.
- Think about load management. Where several chargers share a supply, load balancing avoids overloading it. See our article on EV charger load balancing.
- Look at grants. Government support for landlords and tenants has existed through the OZEV chargepoint schemes, but amounts and funding periods change, so check the official government page for the current rules before applying. Do not install before eligibility is confirmed if you intend to claim.
We install EV chargers for homes and businesses, and you can see more on our EV chargers page. If you have a charger and a battery, or plan both, a smart energy setup can charge the car and the battery in the same cheap window. Our article on smart home energy management explains how.
What happens when you ask us for a quote
A typical battery enquiry runs like this:
- You send us your details. Your tariff, the last year of bills or smart meter data, and whether you have solar or an EV.
- We survey the property. We look at the consumer unit, the meter position, where the battery can go and, if you have solar, the existing inverter.
- We size and price it. The quote sets out capacity, power rating, tariff match and whether backup is wanted.
- We install, test and notify. We fit the system, test and certify it, and deal with the network operator.
- We show you how to use it. You get a walkthrough of the app and the tariff schedule.
FAQ
Can I have a home battery without solar panels?
Yes. The battery charges from the grid, ideally on a cheap overnight rate, and supplies your home when electricity is more expensive. It only makes financial sense if your tariff has a meaningful price gap between cheap and standard rates.
How long does a battery-only system take to pay back?
It depends on cost, usage and tariff. The Centre for Sustainable Energy puts typical payback in the region of 8 to 12 years, and its battery-only worked example, with a £4,600 battery, gives 9 years. Your own figure comes from your meter data and the rates you can access.
Can I add a battery to my existing solar panels?
Yes, in most cases. The installer needs to check your inverter type, whether the consumer unit can take the battery, and whether the combined capacity needs network operator approval. These checks are part of a normal survey.
Will a battery power my home during a blackout?
Not by default. Most systems switch off when the grid goes down. Backup needs a battery and inverter with a backup function, plus wiring that separates the home or selected circuits from the grid, so ask for it at quote stage.
Is VAT charged on a standalone battery?
The government’s Clean Energy page says home battery installations are exempt from VAT until 31 March 2027, including standalone batteries. Check that page for the current position before you order.
Sources
- Battery storage, Energy Saving Trust
- Install a battery, Clean Energy campaign
- Battery storage, Centre for Sustainable Energy
