Why Add Battery Storage?
Without a battery, any solar energy you don't use instantly is exported to the grid — typically earning you 5–15p per kWh. But buying that same electricity back from the grid at peak times costs 25–35p per kWh. A battery lets you use your own cheap solar energy instead.
With average home battery storage adding £4,000–£8,300 to your installation, the combination of solar and battery can dramatically accelerate your return on investment and virtually eliminate your electricity bills.
Power Through the Night
Store surplus daytime energy and use it in the evening — when grid electricity is most expensive.
Bigger Savings
Using stored solar energy instead of grid electricity at peak rates can save an additional £200–£400 per year.
Premium SEG Tariffs
Battery owners can access time-of-use SEG tariffs of 20–30p/kWh — up to 10x the standard export rate.
Power During Outages
Some battery systems offer backup power during grid outages, keeping essential appliances running.
Home Battery Storage Costs
Battery storage costs vary based on capacity, brand, and installation complexity.
| Battery Capacity | Typical Cost | Best For | Est. Extra Savings/Year |
|---|---|---|---|
| 3–5 kWh | £3,500 – £5,000 | Small homes, 1-2 people | £150 – £250 |
| 5–8 kWh | £5,000 – £7,000 | Average homes, 2-3 people | £250 – £350 |
| 8–12 kWh | £7,000 – £9,000 | Larger homes, 3-4 people | £300 – £450 |
| 12 kWh+ | £9,000 – £12,000+ | Large homes, EV charging | £400 – £600+ |
Costs are for battery only, in addition to your solar panel system. Prices include installation at 0% VAT until 2027.
Popular Home Battery Systems
Tesla Powerwall 3
One of the most popular home batteries. 13.5 kWh capacity with a built-in inverter, 10-year warranty, and seamless solar integration.
GivEnergy All-In-One
A cost-effective UK-made system combining inverter and battery storage. Available in 5.2 kWh, 9.5 kWh, and 13.5 kWh capacities.
Solis / Fox ESS
Popular mid-range options offering excellent value, widely installed by UK solar professionals with strong local support networks.
SolarEdge Home Battery
Pairs seamlessly with SolarEdge inverter systems. Modular design allows capacity to be expanded as needs grow.
EV Integration
Many modern battery systems integrate with home EV chargers, letting you charge your car on stored solar energy — free fuel.
Smart Monitoring
All leading battery systems include an app so you can track charging, discharge, and savings in real time from your phone.
Adding Battery Storage: Your Options
Bundle With New Solar Installation
The most cost-effective option — installing panels and battery together minimises labour and scaffolding costs.
Retrofit to Existing Solar
Already have solar? Most modern battery systems can be retrofitted. Your installer will check inverter compatibility.
Choose the Right Capacity
Your installer will assess your daily energy usage, panel output, and goals to recommend the optimal battery size.
Pair With a Smart SEG Tariff
Set up a time-of-use SEG tariff to export when grid prices are highest (typically evening peak hours) for maximum income.