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80%+

Self-Consumption Achieved

£500+

Extra Annual Savings

1 Day

Typical Install Time

10yr

Manufacturer Warranty

Home Battery Storage Installation in Sussex

Green Earth Sussex installs cutting-edge battery storage systems throughout Sussex. Whether you have existing solar panels or are planning a new installation, adding battery storage allows you to store excess solar energy for use when the sun isn't shining. This maximises your self-consumption, reduces your reliance on the grid, and can provide backup power during outages.

We install leading battery brands including Tesla Powerwall 3, GivEnergy All-in-One, SolarEdge Home Battery, SolaX, Solis, and BYD — all with smart monitoring and control via smartphone apps. Our expert team handles everything from system design and integration through to commissioning and ongoing support.

In 2026, battery storage economics are more compelling than ever. With electricity unit rates above 25p/kWh and time-of-use tariffs like Octopus Agile offering 7–12p/kWh overnight rates, a correctly-sized battery system can save Sussex homeowners £500–£900+ per year on top of solar savings alone.

Home Battery Storage

Store excess solar energy for use at night or during power cuts

Backup Power

Automatic backup during grid failures to keep essential appliances running

Maximize Savings

Use stored energy during peak tariff times to reduce electricity bills

Smart Control

Monitor and control your battery system via smartphone app

Energy Independence

Reduce reliance on the grid and increase self-consumption of solar

Expert Installation

Professional installation with full certification and warranties

Battery Storage Costs Sussex 2026

How Much Does Battery Storage Cost in Sussex?

Transparent pricing for home battery storage in Sussex. All prices include installation, commissioning, and DNO notification.

Battery System	Installed Cost	Extra Annual Savings	Best For
5kWh Battery (Entry Level)	£2,500 – £3,500	+£200–£300/yr	Small homes, reduces export
10kWh Battery (Mid Range)	£4,000 – £5,500	+£350–£500/yr	Most popular for 3-4 bed homes
13.5kWh Tesla Powerwall 3	£5,500 – £7,000	+£500–£700/yr	Premium with full backup power
15–20kWh Large System	£7,000 – £10,000	+£600–£900/yr	Large homes or high usage
2+ Battery Stack (20kWh+)	£9,000 – £15,000+	+£900–£1,500/yr	Off-grid or near-off-grid
Battery Retrofit (Add to Existing Solar)	£2,500 – £7,000	Varies by system	Compatible with most inverters

Savings are in addition to solar savings. Final cost depends on installation requirements. Free survey available.

Solar Only

~30% self-consumption rate
~£700–£1,100/yr savings (4kW Sussex system)
Surplus exported at 5–15p/kWh (low return)
No backup during power cuts
No overnight cheap tariff benefit

Solar + Battery

80%+ self-consumption rate
£1,100–£1,800/yr total savings
Stored energy used in evenings instead of grid
Backup power during outages (with suitable system)
Charge from cheap overnight tariffs too

Not sure how much battery storage you need?

Our Sussex engineers provide free home assessments — we'll review your solar generation, energy usage, and recommend the optimal battery size and brand for your budget.

Call Now Book Free Survey

Battery Storage Brands We Install in Sussex

We install all leading battery storage brands across Sussex — each chosen for reliability, warranty terms, and value for money.

Tesla Powerwall 3

13.5kWh | Full home backup

GivEnergy All-in-One

5–12kWh | Smart tariff charging

SolarEdge Home Battery

9.7–48kWh | DC-coupled

SolaX Triple Power

5–17kWh | Modular expandable

Solis RHI Hybrid

5–10kWh | Affordable hybrid

BYD HVM Battery

5–22kWh | High cycle life

Battery System Installation

Tesla Powerwall and other leading battery brands
AC and DC-coupled battery systems
Modular systems with expandable capacity
Indoor and outdoor installation options
Integration with existing solar PV systems
Full electrical certification and DNO notification

Backup Power Solutions

Automatic backup during power cuts
Seamless switchover in milliseconds
Essential circuits backup configuration
Whole-home backup options available
Off-grid capability for complete independence
Battery health monitoring and alerts

Smart Energy Management

Time-of-use tariff optimization
Charge from cheap grid electricity overnight
Discharge during peak tariff periods
Solar self-consumption maximization
Real-time energy flow monitoring
Remote control via smartphone app

Battery Retrofits & Upgrades

Add batteries to existing solar PV systems
Compatible with most solar inverters
Expand existing battery capacity
Upgrade older battery systems
System health checks and optimization
Battery replacement and disposal services

Get a Free Battery Storage Quote in Sussex

Tell us about your property and solar setup — we'll recommend the optimal battery system and provide a free, fixed-price quote.

FREE QUOTE

Get a Free Quote for Battery Storage Systems

Request your free, no-obligation quote today. Our NAPIT approved electricians cover all of Sussex and the surrounding areas. We'll get back to you within 2 hours during business hours.

NAPIT Accredited

All work fully certified to BS 7671 standards

Fast Response

We respond within 2 hours during business hours

Transparent Pricing

Fixed-price quotes with no hidden fees

Fully Insured

All work guaranteed and comprehensively insured

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We'll respond within 2 hours during business hours.

Why Choose Green Earth Sussex for Battery Storage?

Leading Brands

Tesla Powerwall, GivEnergy, SolarEdge, SolaX, BYD and other premium battery systems — fully warranted and installed to manufacturer specs.

Solar & Battery Specialists

We install both solar and battery systems — perfect if you want a combined project or are adding battery to an existing solar installation.

Full Support

Comprehensive warranties, app setup, DNO notification, and ongoing technical support — we're with you every step of the way.

Battery Storage Sussex — FAQs

Common questions about home battery storage systems in Sussex.

Is battery storage worth it in Sussex?

Yes — battery storage is increasingly worth it, especially when paired with solar panels. Sussex homes with a 4–6kW solar system and a 10kWh battery typically increase self-consumption from 30% to 80%+, saving an extra £350–£650 per year compared to solar alone. On the Octopus Agile or Go tariff, you can also charge the battery cheaply overnight and use stored energy during peak hours, adding further savings.

How much does battery storage cost in Sussex?

Battery storage in Sussex typically costs between £2,500 and £10,000+ depending on the system size and brand. A popular entry-level GivEnergy 9.5kWh system costs around £3,500–£4,500 installed, while a Tesla Powerwall 3 (13.5kWh with full backup) costs £5,500–£7,000. Larger stacked systems for near-off-grid capability can reach £12,000–£15,000. We provide free no-obligation quotes.

Can I add battery storage to my existing solar panels?

Yes — and it is one of the most common projects we do. Adding battery storage (a "battery retrofit") to an existing solar system is straightforward in most cases. We assess your existing inverter and determine whether AC-coupled or DC-coupled battery integration is most suitable. Most inverter brands are compatible with our battery systems. We provide a free assessment and explain all options.

What is the difference between AC-coupled and DC-coupled battery storage?

AC-coupled batteries (like Tesla Powerwall or GivEnergy All-in-One) connect to the household AC circuit and can work with virtually any existing solar inverter. DC-coupled batteries connect directly to the solar panels and require a compatible hybrid inverter. DC-coupling is slightly more efficient (no extra conversion losses) but requires compatible equipment or a new hybrid inverter. We assess which is best for your system during the free survey.

How long does battery storage installation take?

Most residential battery storage installations in Sussex are completed in 1 day. This includes installing the battery unit, wiring to your consumer unit or inverter, DNO notification, and commissioning with app setup. Larger systems or installations requiring consumer unit upgrades may take 2 days. We minimise disruption and leave your home clean.

Does battery storage provide backup power during a power cut?

Yes, but only if your system includes a "backup" or "EPS" (Emergency Power Supply) function. Not all battery systems include this by default — the Tesla Powerwall, GivEnergy AIO, and some SolarEdge systems offer full backup capability. We discuss your backup requirements during the free survey and recommend the appropriate system. Whole-home backup vs critical circuits backup are both available options.

What is the Tesla Powerwall and how much does it cost in Sussex?

The Tesla Powerwall 3 is a 13.5kWh battery system with integrated inverter and full whole-home backup capability. It is one of the most technically capable home batteries available and offers the cleanest aesthetic of any battery storage system. In Sussex, a Tesla Powerwall 3 typically costs £5,500–£7,000 installed, depending on electrical work required. It comes with a 10-year warranty covering 70% of original capacity.

Can I charge my battery from cheap overnight electricity as well as solar?

Yes — this is one of the best ways to maximise battery storage savings in Sussex. On tariffs like Octopus Agile, Octopus Go, or OVO Drive Anytime, electricity is significantly cheaper overnight (often 7–12p/kWh vs 25–30p/kWh peak). Your battery intelligently charges from cheap grid electricity overnight AND from your solar panels during the day, maximising self-consumption and minimising grid usage during expensive peak hours.

Related Renewable Energy Services

Explore our full range of solar, battery, and EV services across Sussex.

Battery Retrofits

Already have solar? Add battery storage to your existing system.

Solar PV Installers

Complete solar panel systems for homes and businesses.

EV Charger Installation

Home EV charging points by OZEV-approved electricians.

Workplace EV Charging

Commercial EV charging infrastructure for businesses.

Solar System Health Checks

Performance checks and fault diagnosis for existing solar.

Solar Inverter Replacement

Replace faulty inverters to restore solar performance.

Battery Storage Installation Across Sussex

We cover all areas across East and West Sussex. Select your nearest town for local pricing and availability.

Ready to Add Battery Storage?

Get your free, no-obligation battery storage quote today. Our Sussex team covers the whole county.

Most battery storage installations completed within 1 day. Free site survey included.

Get My Free Quote Call 01273 076860