Battery Storage Installation

Store excess solar energy and use it when you need it most. We install FoxESS, Fogstar, and Sigenergy battery systems with smart monitoring and app control. 0% VAT on all battery installations.

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200+ Installations

What Is Battery Storage?

A home battery storage system stores excess electricity generated by your solar panels during the day so you can use it in the evening and at night. Without a battery, a typical household uses only 30–50% of the solar energy they generate, with the rest exported to the grid at low rates. With a battery, self-consumption rises to 75%+, dramatically reducing the amount of expensive grid electricity you need to buy. Since February 2024, all battery installations attract 0% VAT — whether alongside solar panels, retrofitting to existing solar, or standalone — until March 2027. Modern battery systems like the FoxESS ECS, Tesla Powerwall 3, and Fogstar units include smart monitoring apps that let you track generation, storage, and usage in real-time. Batteries can also charge from the grid during off-peak overnight rates (as low as 7p/kWh on Octopus Go), providing further savings through tariff arbitrage.

Key Benefits

Benefits of Battery Storage

Maximise Solar Savings

Increase self-consumption from 30–50% to 75%+. A 4kW solar system with battery and smart tariff saves approximately £880–£1,030/yr vs ~£440 solar-only.

0% VAT on All Batteries

Since February 2024, ALL battery installations are 0% VAT — standalone, retrofit to existing solar, or alongside new solar — until March 2027.

Smart Tariff Arbitrage

Charge your battery at 7–8p/kWh overnight on Octopus Go or Intelligent, then use that stored energy during the day instead of buying at 24p+. Realistic saving: £300–£550/yr.

Smart Monitoring

Track generation, storage, and consumption via smartphone apps. FoxESS offers an open API for Home Assistant and other smart home integration.

Backup Power

FoxESS systems offer whole-home backup via an EPS add-on with sub-20ms switchover. Tesla Powerwall 3 delivers 11kW continuous output for whole-home backup.

Export Earnings Strategy

Batteries enable export at peak SEG rates using Octopus Flux (peak export ~22–28p/kWh). Average Flux household earns ~£378/yr from exports.

Our Process

How It Works

Step 1

Free Survey

We visit your property to assess your heating needs, measure heat loss, and discuss the best options for your home.

Step 2

Design & Quote

We design a bespoke system, identify all eligible grants including the £7,500 BUS scheme, and provide a transparent fixed-price quote.

Step 3

Installation

Our MCS certified engineers install your system cleanly and efficiently, typically within 2–4 days, with minimal disruption to your home.

Step 4

Aftercare

Full system handover, MCS certification, warranty registration, BUS grant application completion, and ongoing support when you need it.

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Battery Storage Costs

A 5kWh home battery system costs approximately £3,000–£4,500 installed alongside solar (£4,500–£6,000 standalone retrofit). A 9.5kWh system costs £4,500–£7,000 with solar. The Tesla Powerwall 3 (13.5kWh, built-in inverter) costs £7,500–£11,500 installed. All battery installations attract 0% VAT until March 2027. Most battery systems pay for themselves within 5–7 years through increased solar self-consumption and smart tariff savings. We help you choose the right capacity based on your solar system size, electricity usage patterns, and preferred tariff strategy.

See battery and solar cost guide

Trusted Partners

Brands We Install

Foxstar

Tesla Powerwall

FoxESS

Fogstar

Sigenergy

Enphase

What We Install

Products We Use

We only install products we trust. Click any product below to see full specifications and why we recommend it.

Foxstar

Foxstar Home Battery

Modular LiFePO4 home battery with 5–20 kWh capacity and 10-year warranty

View specifications

Tesla

Tesla Powerwall 3

All-in-one solar + storage system with 13.5 kWh capacity and 97.5% round-trip efficiency

View specifications

Browse all products we install

Areas We Cover for Battery Storage

We install battery storage across Cornwall. Click your area for local information and a free quote.

St Austell Bodmin Truro Newquay Wadebridge Par & St Blazey Padstow

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Maximise Your Savings

Pair Your Battery Storage with Another Service

Many of our customers save more by combining services. Here's what works best with a Battery Storage.

Complete System

£1,600+combined annual saving

A Battery Is Most Valuable with Solar Panels

A battery on its own can save money on time-of-use tariffs, but the real savings come from combining it with solar. Together they can save £1,600+ per year on a typical home.

Add Solar Panels

Want a bundled quote for multiple services? Contact us for a combined survey.

Our Work

Recent Battery Storage Projects

Real installations by our team across Cornwall — challenge, solution, and outcome.

9.5 kWh Foxstar Battery Added to Existing Solar, Truro

Truro • 3-bedroom semi-detached

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Common Questions

Frequently Asked Questions

Is a battery worth it with solar panels?

A battery significantly increases the value of your solar panels. Without a battery, you typically use only 30–50% of the solar energy you generate — the rest is exported to the grid at 15–25p/kWh. With a battery, self-consumption rises to 70–90%, meaning you use your own free solar energy instead of paying 24.67p/kWh from the grid. A 9.5kWh battery system costs £4,500–£7,000 installed (at 0% VAT). In Cornwall, battery storage typically pays back in 5–7 years.

How long do home batteries last?

Modern lithium iron phosphate (LiFePO4) home batteries — including Foxstar and Tesla Powerwall — are warranted for 10 years and designed to last 15+ years. LiFePO4 chemistry is the safest, most stable battery chemistry available, with no thermal runaway risk and excellent long-term capacity retention.

Can I add a battery to my existing solar panels?

Yes, batteries can be retrofitted to any existing solar PV system. We install AC-coupled battery systems (such as the Foxstar or Tesla Powerwall) alongside your current inverter, compatible with any solar system regardless of age. A retrofit typically takes 1 day and we handle all DNO notifications. The 0% VAT rate applies to battery storage installed alongside solar.

Can a battery provide backup power during a power cut?

Yes — some home batteries including the Tesla Powerwall and certain Foxstar configurations provide backup power during a grid outage, automatically switching to battery power when the grid fails. This is a particularly useful feature for rural properties in Cornwall where power cuts can occur. Not all batteries include backup as standard, so we advise on this when recommending a system.

What is the best battery to buy with solar panels?

Foxstar and Tesla Powerwall are our most frequently installed systems. Foxstar offers excellent value, strong UK customer support, and modular capacity. Tesla Powerwall has a sleeker design, excellent software, and strong backup power features. The right choice depends on your budget, whether backup power matters to you, and whether you want to expand capacity in future. We install both and provide impartial advice.

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