The 6 Best Solar Batteries in the UK: Budget-Friendly, Backup Power, Weather Resistance, Smart Tariff Compatibility, Expandable Options, and 3-Phase Support

Best solar batteries

In the quest for sustainable living and energy independence, solar batteries have emerged as game-changers. They not only store excess solar energy for later use but also ensure a continuous power supply during outages, making them an indispensable part of modern solar energy systems. With a plethora of options available, selecting the right solar battery can be daunting. This article delves into the best solar batteries of 2024, focusing on various needs such as outdoor installation, backup supply, budget constraints, specific tariffs, three-phase power supply, and expandability.

Category Best Battery Key Features
Outdoor Installation Tesla Powerwall 2 IP67 rated, weatherproof, liquid cooling thermal management
Backup Supply GivEnergy All-in-One 6 kW continuous and 7.2 kW peak power output
Limited Budget FoxESS Affordable lower cost systems with great built quality
Octopus Energy Tariff GivEnergy Batteries works with Octopus's smart solar battery tariff - Intelligent Octopus Flux
Three Phase Power Supply KSTAR BluE All-in-one design; 10 kW three-phase hybrid inverter; Adjustable power in each phase
Expandability Sunsynk Connect up to 16 battery packs per inverter (totalling 82 kWh)

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Tesla Powerwall 2: The Best Battery for Outdoor Installation

The Tesla Powerwall stands out for its IP67 rated weatherproof enclosure and liquid cooling thermal management system, making it the best battery for outdoor installation. It has a wide operating temperature range -20 oC to 50 oC, which beats all the other batteries on the market. Tesla Powerwall can provide unparalleled battery performance in the cold winter. Its weatherproof design also eliminates the need for additional canopy or enclosure for outdoor protection.

Tesla Powerwall Snow Cold Weather

Read more:
How Cold Weather Impacts Solar Battery Performance And Capacity
Best Location for Placing Your Solar Battery

GivEnergy All-in-One: The Ultimate Backup Supply Solution

Many hybrid inverters nowadays have built-in emergency power supply ports, but special transfer switches are required to enable transition from grid to battery-powered circuits.

GivEnergy has designed a companion Gateway for their all-in-one system. It serves as a seamless transition point between the grid and battery power, ensuring uninterrupted electricity supply during outages. Additionally, it acts as a connection hub for solar PV systems, enabling continuous energy generation even in the absence of grid supply.

GivEnergy Backup Gateway
GivEnergy Backup Gateway
  • 18400W nominal AC power
  • Grid services ready
  • Pre-installed energy meter
  • 20 ms switchover time

In addition, the battery system has a generous 13.5 kWh storage capacity which can keep your lights on and power essential devices for several hours.

Although Tesla Powerwall also comes with backup functionality and a 13.5 kWh storage capacity, GivEnergy all-in-one wins due to its higher continuous power output (6 kW Vs Tesla’s 5 kW).

Read more:
Solar Battery Backup For Home Power Outages
GivEnergy All-in-One vs Tesla Powerwall

FoxESS: The Budget-Friendly Powerhouse

When budget constraints are a concern, FoxESS emerges as the best solar battery option. With distributor prices getting close to £200 per kWh storage capacity, they are the most affordable battery system available in the UK market at the time of writing.

Despite its affordability, FoxESS does not compromise on quality or performance. Users have praised its reliability and the quality of the hardware. Although the app and cloud platform may have limitations, the system itself covers all the essentials, offering a cost-effective solution for those looking to adopt solar energy without breaking the bank.

FoxESS battery system

GivEnergy for Octopus Energy Tariff

For those on the Octopus Energy Tariffs, GivEnergy batteries offer an optimal solution. These batteries are designed to work with specific Octopus solar battery tariffs, such as Intelligent Octopus Flux.

With the Intelligent Octopus Flux smart tariff, the GivEnergy home battery operates intelligently, automatically adjusting its charging and discharging cycles to capitalise on the best energy rates through a direct API link with Octopus. GivEnergy batteries ensure seamless integration and optimal management of energy consumption without the need for manual programming. This streamlined process guarantees customers access to the most cost-effective rates hassle-free.

GivEnergy configuration pricing

Read more:
Best UK Electricity Tariff For Home Battery Storage

KSTAR: Best Battery for Homes and SMEs with Three Phase Power Supply

Three-phase power supplies are common in commercial buildings and increasingly in residential properties with high power demands. However, in the UK there aren’t many battery storage systems designed specifically for three-phase.

KSTAR’s 10 kW 3-phase all-in-one battery system is currently the best available storage solution for businesses and homes with three-phase power supply.


  • 10 kW three-phase ready hybrid inverter
  • Adjustable power in each phase; support three-phase power imbalance
  • Support 200% oversized PV power (20 kW)
  • 9.2 kW 3-phase backup output, less than 20 ms on/off-grid switching
  • Built with CATL LFP battery cells and comes with 10-year, 10,000-cycle life warranty (guaranteed 80% capacity retention by the end of 10 years)
  • Expandable storage capacity – up to 40 kWh per inverter
  • Diesel generator compatible
  • IP65 weatherproof suitable for outdoor installations
KSTAR 10 kW Three phase battery system
KSTAR 10 kW Three phase battery system

Sunsynk: The King of Expandability

For those looking to future-proof their solar energy system, Sunsynk offers unparalleled expandability. With the capacity to link up to 16 battery packs (totalling 82 kWh) per inverter, and the ability to parallel up to 16 inverters, Sunsynk stands out for its scalability. This feature is particularly beneficial for households or businesses anticipating growth in their energy needs, allowing for easy expansion without the need for a complete system overhaul.


Choosing the right solar battery is crucial for maximising the benefits of solar energy. Whether your priority is weather resistance, backup supply, budget, specific tariffs, three-phase power supply, or expandability, there is a solar battery out there that meets your needs. By considering the options outlined in this guide, you can make an informed decision that enhances your energy independence and contributes to a more sustainable future.

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We will use the provided information to suggest a home battery system that aligns with your energy needs. Our team will contact you to discuss the system’s design and installation costs. Should you decide to move forward with our proposal, we’ll arrange for an on-site survey to assess your current electrical setup.

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