Home battery storage lets you store surplus solar energy (or cheap off-peak electricity) for use when you need it most - typically evenings and peak-rate hours. Combined with solar panels, a battery can reduce your grid dependence by 70-80% and significantly boost your annual savings.
Battery Storage Costs by Capacity
| Capacity | Cost Range | Popular Models | Best For |
|---|---|---|---|
| 3-5 kWh | £2,500-£4,000 | Solax, GivEnergy 5.2 | Small solar systems, 1-2 bed |
| 8-10 kWh Most Popular | £4,500-£7,000 | GivEnergy 9.5, BYD HVS | 3-4 bed, typical solar setup |
| 13-14 kWh | £6,500-£8,500 | Tesla Powerwall 2 | Large home, high usage, EV |
| 15-20 kWh | £8,000-£10,000 | Stacked GivEnergy, BYD | Very high usage, full backup |
Prices include installation and 0% VAT. Retrofit battery (adding to existing solar) may cost £200-£500 more than bundled installation.
Top Battery Brands Compared
| Brand / Model | Capacity | Warranty | Cycle Life | Price (installed) |
|---|---|---|---|---|
| Tesla Powerwall 2 | 13.5 kWh | 10 years | Unlimited* | £6,500-£8,500 |
| GivEnergy 9.5 | 9.5 kWh | 12 years | 6,000 | £4,500-£5,500 |
| BYD HVS 10.2 | 10.2 kWh | 10 years | 8,000 | £5,000-£6,500 |
| Solax T-BAT 5.8 | 5.8 kWh | 10 years | 6,000 | £2,800-£3,800 |
| Fox ESS ECS4100 | 10.4 kWh | 10 years | 8,000 | £4,200-£5,500 |
*Tesla Powerwall has unlimited cycles within the 10-year warranty. Prices include standard installation. March 2026.
How Much Extra Do You Save with a Battery?
£300-£500
Extra annual savings
vs solar-only system
75%
Solar self-consumption
vs 40% without battery
8-12 yrs
Battery payback period
Depending on usage
Best value: Install battery alongside solar panels - bundle pricing saves 10-20% vs retrofitting later, and you start maximising savings from day one. See solar + battery bundle costs →
Frequently Asked Questions
A home battery storage system costs £2,500-£10,000 depending on capacity. A typical 5kWh battery costs £2,500-£4,000, a 10kWh system costs £4,500-£7,000, and a 13.5kWh Tesla Powerwall costs £6,500-£8,500. All prices include installation.
Battery storage can be worthwhile without solar if you have an economy tariff. You charge the battery at 7p/kWh overnight and discharge during peak hours at 24p/kWh, saving the difference. However, savings are significantly greater when paired with solar.
Most home batteries are warranted for 10 years or a certain number of charge cycles (typically 6,000-10,000). In practice, a well-managed battery can last 12-15 years, retaining 70-80% of original capacity.
Yes. Battery storage systems qualify for 0% VAT when installed in a residential property, whether installed alongside solar panels or retrofitted separately. This saves you approximately £500-£1,500.