Solar panels are a proven way to cut electricity bills, but without a solar battery storage system, much of your free, green energy could go unused. In the UK, where energy prices remain high and the shift to renewables is accelerating, many homeowners and businesses are asking: “Is solar battery storage worth it?”
In this guide, we’ll break down how solar batteries work, the pros and cons, costs, savings potential, and whether they’re a good investment for UK households in Norfolk, Norwich, Fakenham, King’s Lynn, Great Yarmouth, Dereham, Thetford, Attleborough, Cromer, and beyond.
Electricity prices remain volatile, and batteries give you more control. Every unit of stored solar energy you use is one less unit you buy at retail rates.
Without a battery, UK homes typically use 20–40% of the solar energy they generate. With a battery, that figure can rise to 60–80%, significantly improving the system’s payback time.
Some advanced batteries can provide backup power during blackouts, giving peace of mind for families or businesses that need resilience.
As more households in Norfolk switch to EV chargers and heat pumps, storing daytime solar generation becomes increasingly valuable.
Small capacity (4–6kWh): ~£3,000–£4,500
Medium capacity (7–10kWh): ~£5,000–£6,500
Large capacity (11–15kWh+): £7,000–£8,500+
Costs depend on the brand (Tesla Powerwall, GivEnergy, Sonnen, LG Chem, etc.), installation complexity, and whether you’re adding a battery to an existing solar system or installing from scratch.
Let’s look at an example:
Over a year, this can mean £300–£500 more in savings, depending on usage patterns.
For high-consumption homes (EV charging, electric heating), payback can be faster.
The answer depends on your situation:
Worth it if:
You use a lot of electricity in the evenings
You have an EV or plan to install one soon
You want resilience against power cuts
You’re in an area like Norfolk, where solar installations are increasingly popular and energy demand is high
Pairing a battery with a time-of-use tariff (like Octopus Go or Intelligent Octopus) can increase savings. You can charge the battery overnight with cheaper off-peak electricity, then use it during peak hours. Even homes without solar panels sometimes use this strategy.
Q1. How long do solar batteries last?
Most solar batteries last 10–15 years, with warranties covering 6,000+ charge cycles.
Q2. Do I need a solar battery in the UK?
Not always. If you’re home during the day and already use most of your solar generation, a battery may not provide a strong return.
Q3. How much does solar battery storage cost in Norfolk?
Typically £3,000–£8,500 depending on size. Local installers like DJB Electrical can give tailored quotes.
Q4. Can solar batteries power my home in a power cut?
Some can (if they have backup capability), but not all. Always ask your installer.
Q5. Can I add a battery to an existing solar system?
Yes — retrofitting is possible, though it may be more cost-effective to combine it with a new solar installation.
At DJB Electrical, we install and maintain solar PV and battery systems across Norwich, Fakenham, King’s Lynn, Great Yarmouth, Dereham, Thetford, Attleborough, Cromer, and the wider Norfolk area.
We’ll help you calculate:
How much storage you need
The likely savings for your household
Whether a battery is truly worth it for you
Solar battery storage can be worth it in the UK — particularly in 2025, as energy prices stay high and more households switch to EVs and heat pumps. While the upfront cost is significant, the long-term savings, independence, and resilience often make the investment attractive.