Solar Battery Storage in the UK

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Solar Battery Storage In The UK: Is It Worth Your Money?

Is solar battery storage worth it for UK homeowners? We break down the costs, savings, top brands and everything you need to know before making a decision.

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Introduction

Solar panels on their own are a solid investment. But if you have looked into solar at all, you will have noticed that most installers recommend adding battery storage to the system. There is a straightforward reason for that, and it is worth understanding before you decide.
This guide explains exactly what a solar battery does, how much difference it makes to your savings, what Proximus Solutions offers and whether it is worth the additional upfront cost for your home.

What Is Solar Battery Storage and How Does It Work?

A solar battery is a storage unit connected to your solar panel system. During the day, when your panels generate more electricity than your home is using, that surplus energy would normally be exported to the national grid. A battery captures it instead, storing it for use later.
In the evening, when your panels stop generating, your home draws from the stored battery power rather than importing expensive electricity from the grid. The result is that a much higher proportion of the energy your panels generate actually gets used in your own home.
Without a battery, a typical UK household uses around 25 to 35% of its solar generation directly. Add a battery and that figure rises to 70% or more, depending on system size, household usage and daily routine. That difference in self-consumption is where most of the financial case for battery storage sits.

Why Battery Storage Makes Sense for UK Homes?

The UK’s energy usage pattern does not align well with solar generation. Panels produce electricity between roughly 7am and 6pm, peaking around midday. Most households use the most electricity in the morning before work, in the evening after work and during the night.
If nobody is home during the day, the bulk of your solar generation happens while the house is empty. Without a battery, that electricity goes to the grid at the Smart Export Guarantee rate, currently around 15 pence per unit. A battery stores it so you use it yourself when you get home, saving you the 24 to 25 pence per unit you would otherwise pay to import from the grid.
That gap between the export rate and the import rate is the core financial argument for battery storage. Over a full year, it adds up to hundreds of pounds in additional savings compared to a solar-only system.

How Much More Can You Save With A Battery?

A solar battery helps you use more of the electricity your panels generate instead of exporting it to the grid. This increases your energy independence and annual savings.

Most UK homeowners can save an additional £250–£350 yearly with battery storage, depending on their energy usage and system size.

Solar Batteries Available From Proximus Solutions

Proximus Solutions supplies and installs the UK’s most trusted solar battery systems, helping homeowners store excess solar energy and reduce reliance on the grid.

All battery systems installed by Proximus Solutions are MCS-compliant, app-enabled and backed by manufacturer warranties for long-term peace of mind.
Residential battery installations currently benefit from 0% VAT until 2027, helping reduce the overall cost of adding energy storage to your solar system.

Which Battery Is Right For Your Home?

The best battery depends on your budget, energy usage and long-term goals.

Alpha ESS

A great choice for homeowners looking for reliable battery storage at an affordable price. Alpha ESS offers excellent value and is suitable for most standard UK households.

Sigenergy SigenStor

Ideal for homeowners who want advanced energy management and future flexibility. Sigenergy integrates well with smart home technology and is particularly attractive for households planning to add an EV charger.

Tesla Powerwall 3

Designed for homeowners who want maximum energy independence and premium performance. With a large storage capacity and advanced monitoring features, it is one of the most capable battery systems available.
If you’re unsure which option is right for your property, Proximus Solutions can recommend a battery based on your energy usage, solar generation and future requirements.

What Does the Battery Warranty Actually Cover?

Battery warranties are one of the most important factors when comparing energy storage systems. Most leading manufacturers provide a 10-year warranty covering both product performance and battery capacity retention.

A quality battery warranty covers more than just hardware failure. It also guarantees that the battery will retain a minimum level of storage capacity throughout the warranty period. If performance falls below the manufacturer’s guaranteed threshold, the battery may be repaired or replaced under warranty.
All battery installations from Proximus Solutions are backed by manufacturer warranties and professional installation standards for added peace of mind.

Who Should Prioritise Battery Storage?

Battery storage is beneficial for most households, but it makes the strongest financial case in specific situations:

Out during the day: If nobody is home for most of the solar generation window, a battery is essential to capture that daytime output and use it in the evening.
High evening usage: Households that use significant electricity after 5pm, cooking, appliances, heating, benefit most from stored solar energy available on demand.
Larger homes with higher bills: The higher your electricity consumption, the more a battery can offset, and the faster it pays for itself.
EV owners or future EV buyers: Battery storage integrates well with EV charging, allowing overnight charging from stored solar rather than grid electricity.
Households concerned about energy price rises: A battery maximises your insulation from grid price fluctuations by keeping more of your consumption off the grid entirely.

The one scenario where battery storage adds less value is a household where someone is at home throughout the entire solar generation window and directly consumes most of what the panels produce in real time.
Even then, a battery still captures any surplus for evening use and remains a worthwhile addition for most.

Can You Add a Battery to an Existing Solar System?

In many cases, yes. Whether retrofit battery storage is possible depends on the type of inverter already installed in your system.
Systems with a hybrid inverter, which is designed to work with battery storage, can typically have a battery added without replacing any major components. Systems with an older string inverter may require an inverter upgrade alongside the battery installation.
Proximus Solutions can assess your existing system and advise whether retrofit battery storage is compatible without significant additional works. If you already have solar panels and are considering adding storage, contact the team for a straightforward assessment before committing to anything.

Ready To Take An Action?

Proximus Solutions offers three solar and battery packages to suit different homes, budgets and energy goals. All installations are MCS certified, HIES insurance-backed and covered by a 25-year panel warranty.
Use the Pro Solar Savings Calculator on the Proximus Solutions website to get a personalised savings estimate based on your actual bill and daily routine. No obligation, no salesperson, just clear information.
Get in touch with Proximus Solutions today for a free solar quote.

Frequently Asked Questions

How long does a solar battery last?

Most solar batteries come with a 10-year warranty covering both product performance and capacity retention. With proper use and maintenance, many battery systems continue operating beyond the warranty period.

What happens to the battery during a power cut?

This depends on the battery system and its configuration. Some batteries can provide backup power during a grid outage, while standard grid-tied systems shut down for safety. If backup power is important, discuss this during the design stage.

Does battery storage work on cloudy days?

Yes. Solar panels continue generating electricity in daylight, even in cloudy conditions. While output is lower than on sunny days, the battery can still charge and store available energy.

Is the battery included in the 0% VAT offer?

Yes. The current 0% VAT rate applies to residential solar and battery installations, helping reduce the overall cost of the system.

How do I monitor my battery usage?

All Proximus Solutions battery systems include smart monitoring through a mobile app. You can view battery charge levels, solar generation, energy usage and grid imports in real time.