What Is Solar Battery Storage Installation?
Solar battery storage installation is the fitting of a home battery that holds surplus electricity from your panels for use later in the day. Without storage, a household may export much of its midday generation; whether keeping more of it saves money depends on its electricity and export tariffs.
A battery can go in at the same time as new panels, or be added later to an existing array. Many owners also use them to charge from the grid on a cheap overnight tariff, which can make a battery worthwhile even in winter when solar output is low.
Signs a Solar Battery Could Help
- Your monitoring app shows most of your midday generation being exported rather than used
- The house is empty during the day and most electricity is used from late afternoon onwards
- You are on, or considering, a time-of-use tariff with a cheap overnight rate
- You have an electric car or heat pump and want to shift more consumption away from peak prices
- You would like some backup power for essential circuits during grid outages (this needs a system designed for it)
Solar Battery Options Explained
- DC-coupled with a hybrid inverter — the panels and battery share one hybrid inverter, and solar energy charges the battery without an extra conversion. It is efficient and tidy, and usually the choice for new installations or when an existing inverter is due for replacement anyway.
- AC-coupled battery — the battery has its own inverter and connects on the AC side, leaving the existing solar inverter untouched. This is the simplest retrofit when the current inverter still has life in it.
- All-in-one units — some products combine battery and inverter in one wall-mounted cabinet. Examples UK installers commonly fit include GivEnergy, Fox ESS, Tesla Powerwall and SolaX, though the right choice depends on your system rather than the brand.
Usable capacity is the figure to compare. Most homes choose between about 5kWh and 13.5kWh; bigger is not always better if the battery rarely fills or empties.
What to Include When Asking for a Quote
Give the installer the make and model of your current solar inverter, the size of your array in kW and the year it was installed, plus a screenshot of a typical summer and winter day from your monitoring app if you have one. Those details decide whether an AC-coupled battery can sit alongside what you have or whether a hybrid inverter replacement makes more sense.
Share your electricity tariff and how your household uses power across the day — especially evening peaks, electric car charging and any heat pump. Say where you would like the battery to go: garage, utility room or loft each have different temperature, fire-safety and cable-run implications, and some manufacturers do not allow installation in certain locations.
The quote should state the battery's usable capacity in kWh, its continuous power output in kW, the inverter arrangement, whether backup or an emergency power supply is included, and who deals with the network operator. Check the battery warranty terms — usually expressed as years and a minimum retained capacity — and whether the installer will configure charging schedules for your tariff at handover.
How Much Does Solar Battery Storage Cost?
| Battery size | Typical cost |
|---|---|
| Around 5kWh usable | £3,000 – £4,500 |
| Around 8–10kWh usable | £4,500 – £6,500 |
| 13kWh+ or battery with hybrid inverter swap | £6,500 – £8,500+ |
Prices include installation and assume the 0% VAT rate that currently applies to batteries installed in homes, including retrofits to existing solar. A whole-house backup system, a consumer unit upgrade or a long cable run will add to the cost.
The Battery Installation Process: What to Expect
- Assessment. The installer reviews your usage, tariff and existing solar equipment, and checks the proposed battery location.
- Network operator paperwork. Depending on the total inverter capacity, the installer notifies or applies to your DNO, sometimes with export limitation set on the inverter.
- Installation. The battery and any new inverter are wall- or floor-mounted, cables are run and the system is connected to the consumer unit. Power is usually off for a short period.
- Commissioning. The system is tested, firmware is updated and the monitoring app is linked to your account.
- Tariff setup and handover. Charging and discharge schedules are configured and you receive certificates and warranty registration details.
Do I Need Planning Permission for a Solar Battery?
A battery installed inside the home or garage does not normally need planning permission. Listed buildings may need consent for any associated external works. Electrical work must meet the rules in the relevant UK nation and the wiring regulations. In England and Wales, Part P applies to domestic electrical safety. Installers should also follow the IET code of practice for electrical energy storage systems, including guidance on location and fire safety.
Your network operator must be told about the battery. Under the engineering recommendations G98 and G99, whether it is a simple notification or an application before connection depends on the combined output of all the inverters in the property.
How to Choose a Solar Battery Installer
- Is the installer MCS-certified for battery storage and registered with a consumer code?
- Have they explained why the proposed capacity suits your usage rather than simply fitting the largest model?
- Is the design AC-coupled or hybrid, and what happens to your existing inverter's warranty?
- Does the price include backup functionality, or is that an extra?
- Will they set up tariff-based charging schedules and show you how to change them?
Frequently Asked Questions
Can I add a battery to my existing solar panels?
Yes, in most cases. An AC-coupled battery can work alongside your current inverter, or the inverter can be swapped for a hybrid model that runs both the panels and the battery.
What size solar battery do I need?
Most households choose between 5kWh and 13.5kWh of usable capacity. The right size depends on your evening and overnight consumption, your solar array size and whether you charge from a cheap night-time tariff.
Will a solar battery keep my power on during a power cut?
Not automatically. Many batteries shut down during a grid outage for safety unless the system includes a backup or emergency power supply function, which should be specified in the quote.
How much does solar battery storage cost?
Most UK home battery installations cost between £3,000 and £8,500, depending on usable capacity, the inverter arrangement and any backup or electrical upgrade work.