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Home Battery Storage Systems

Capture 100% of your daytime solar surplus, eliminate evening peak grid tariffs, and protect your home during power cuts. We are certified installers for EcoFlow, SolaX, Fox ESS, Tesla Powerwall 3 and Duracell Energy.

Explore 5 Battery Systems Side-by-Side Comparison View Battery Installs
THE FINANCIAL ADVANTAGE

Why Add a Battery to Your Home?

Without battery storage, up to 60% of your generated solar electricity is exported to the grid for pennies while you buy electricity back in the evening at full retail rates.

Use Free Solar at Night

Store excess solar during sunny midday hours. Run your ovens, heat pumps, computers and lighting after dark without paying peak grid rates.

Off-Peak Smart Charging

Charge your battery overnight at 7p/kWh on tariffs like Octopus Agile, Go or Cosy. Discharge during expensive 32p/kWh peak hours to save hundreds each winter.

Emergency EPS Backup

When storm gales trip the local national grid, your battery's Emergency Power Supply (EPS) seamlessly powers your critical circuits in milliseconds.

COMPLETE SPECIFICATIONS

The 5 Leading Systems We Supply & Certify

We offer impartial, honest recommendations based on where the battery will be positioned (indoor, loft, unheated garage or outdoor), your household consumption and your budget.

800V High Voltage Technology

EcoFlow PowerOcean

EcoFlow's whole-home storage system utilizes an ultra-safe 800V high-voltage architecture with CATL LFP battery cells. The modular design lets you begin with a single 5kWh block and stack up to 30kWh as your energy needs expand.

  • Efficiency: World-class 97% round-trip efficiency minimizing storage thermal loss
  • Cold Protection: Built-in auto-heating module enables charging down to -20°C
  • IP65 Weatherproof: Engineered for garage, utility room or outdoor garden placement
  • App Control: AI-powered energy scheduling with real-time tariff tracking
Installed System Price
Tailored Capacity Quote (5–30kWh • 0% VAT)
10-Year Manufacturer Warranty
EcoFlow PowerOcean battery system
Capacity Range
5–30 kWh
Round-Trip Efficiency
97%
Operating Temp
-20°C to +50°C
Chemistry
LFP (LiFePO4)
Sub-Zero Garage Specialist

SolaX Power Gen4 Triple Power

The UK's top choice for external and unheated garage installations. SolaX's Gen4 Triple Power battery system incorporates active internal heating mats that allow full charging performance even in freezing temperatures down to -30°C.

  • Active Heating: Maintains optimal cell temperatures in freezing winters without power degradation
  • Capacity: 5.8kWh base module expandable to 11.6kWh and 17.4kWh
  • Switchover Time: Under 10ms seamless UPS backup during UK power grid cuts
  • Tariff Pairing: Built-in dynamic integration with Octopus Agile and Flux export schemes
Installed System Price
Tailored Capacity Quote (5.8–17.4kWh • 0% VAT)
10-Year UK Warranty
SolaX battery installation
Capacity Range
5.8–17.4 kWh
Extreme Rating
-30°C Rated
Switch Time
< 10ms (UPS)
Depth of Discharge
90% DoD
AI Load Shifting & High Scalability

Fox ESS H3 / H3-Pro

Fox ESS combines advanced power electronics with AI algorithms that continuously monitor UK electricity market pricing. The system automatically shifts your consumption away from peak rates while pre-charging your battery during negative pricing windows.

  • AI Automation: Machine learning forecasts household consumption and UK weather yields
  • High Scalability: 5.12kWh up to 25.6kWh stackable energy blocks
  • V2G Compatibility: Designed for future vehicle-to-grid integration and heavy power draw
Installed System Price
Tailored Capacity Quote (5.12–25.6kWh • 0% VAT)
10-Year Manufacturer Warranty
Fox ESS battery system
Capacity Range
5.12–25.6 kWh
Round-Trip Efficiency
96%
Cycle Life
> 6,000 Cycles
Three Phase Option
Yes (H3 Series)
All-in-One Solar Inverter & Battery

Tesla Powerwall 3

The benchmark in residential energy storage. Features a massive 13.5kWh usable capacity with an integrated 11.5kW solar inverter and 6 solar string MPPTs. Seamlessly handles whole-home backup including air conditioning and heat pumps.

  • Integrated Inverter: No separate solar inverter required — clean, single-box wall installation
  • Storm Watch: Automatically pre-charges to 100% capacity when Met Office severe weather warnings are issued
  • Continuous Output: Unmatched 11.5kW continuous real power output capability
Installed System Price
Tailored Capacity Quote (13.5kWh All-in-One • 0% VAT)
10-Year Tesla Warranty
Tesla Powerwall 3
Usable Capacity
13.5 kWh
Inverter Output
11.5 kW
Solar MPPTs
6 Inputs
Storm Watch
Automatic
Globally Trusted Energy Brand

Duracell Energy Bank

Powered by Duracell's trusted battery technology. Designed to pair with the Duracell DuraCharger EV unit for an all-in-one ecosystem controlled via the intuitive DuraPower mobile app.

  • Modular Storage: 5kWh base block stackable up to 15kWh residential storage
  • EV Sync: Prioritizes car charging from clean battery reserve before touching the national grid
  • UK Support: Dedicated UK engineering helpline and rapid hardware replacement guarantee
Installed System Price
Tailored Capacity Quote (5–15kWh • 0% VAT)
10-Year Duracell Guarantee
Duracell Energy Bank
Capacity Range
5–15 kWh
EV Integration
DuraCharger
Round-Trip Eff.
95%
Emergency Backup
Supported
TECHNICAL COMPARISON

Compare All 5 Battery Systems Side by Side

Review key performance indicators including usable capacity, cold weather ratings, built-in inverters and guide installed pricing.

Specification EcoFlow PowerOcean SolaX Gen4 Fox ESS H3-Pro Tesla Powerwall 3 Duracell Energy Bank
Usable Capacity 5 to 30 kWh 5.8 to 17.4 kWh 5.12 to 25.6 kWh 13.5 kWh 5 to 15 kWh
Round-Trip Efficiency 97% 95% 96% 90% 95%
Internal Inverter Separate Hybrid Separate Hybrid Separate Hybrid Built-in 11.5kW Separate Hybrid
Extreme Cold Rating -20°C (Auto-Heat) -30°C (Active Heat) -10°C -20°C -10°C
Blackout Switchover Seamless < 20ms Ultra-Fast < 10ms < 20ms < 20ms < 20ms
Chemistry LFP (LiFePO4) LFP (LiFePO4) LFP (LiFePO4) LFP (LiFePO4) LFP (LiFePO4)
Standard Warranty 10 Years 10 Years 10 Years 10 Years 10 Years
VAT Incentive Status 0% VAT Qualifying 0% VAT Qualifying 0% VAT Qualifying 0% VAT Qualifying 0% VAT Qualifying
FREQUENTLY ASKED QUESTIONS

Battery Storage FAQs

Get clear answers to common questions about battery capacity sizing, fire safety and installation time.

Yes! This is called "standalone grid arbitrage." You charge the battery on a smart tariff (such as Octopus Go or Agile) at 7p/kWh during cheap overnight off-peak hours. In the daytime and evening, your home draws power from the battery rather than paying 28p/kWh from the grid, saving over £600/year even with no solar panels installed.
An average UK family home consumes 8–12 kWh of electricity each day, with around 5–8 kWh used during evening peak hours. A 5.8kWh to 10kWh battery provides the sweet spot for maximum return on investment. If you own an EV or heat pump, a 13.5kWh to 15kWh capacity is recommended.
All five brands we install use Lithium Iron Phosphate (LiFePO4 / LFP) chemistry. Unlike older lithium-ion phone batteries (NMC), LFP cells cannot suffer thermal runaway, produce zero flammable gases under normal operation, and are rated non-combustible to rigorous international standards (IEC 62619 and UL 9540A).
A standalone battery installation or retrofit to an existing solar system is completed in 4 to 6 hours. When installed together with solar panels, the entire project is completed in 1 to 2 days with zero overnight power outages.
GET YOUR FIXED QUOTE

Book Your Free Site Survey

Speak directly to our certified electrical engineers. We visit your property, assess your roof/electrical installation, and provide an itemized proposal with zero obligation.

Telephone
07900 204024
Email Address
[email protected]
Operating Base
22 St Albans Road, Watford, WD24 4AU
Accreditation
NAPIT Registered Contractor #67518

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