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Energy storage

Store solar energy.Use it when you need it.

LEWIS TerraVault™ and TerraVault Max™ store surplus solar energy for use after sunset, during grid interruptions and whenever additional power is needed. Available in 5, 10 and 16 kWh capacities, each system combines durable LiFePO₄ chemistry, selected REPT energy-storage cells and intelligent battery management for dependable everyday storage.

Choose TerraVault™ for straightforward, reliable energy storage or TerraVault Max™ for an integrated display, Wi-Fi connectivity and enhanced system visibility.

Get a free quote View datasheet
The Lewis TerraVault range – 5 kWh and 10 kWh wall-mounted units alongside a 16 kWh floor-standing cabinet
5 · 10 · 16 kWh
Capacity options
LiFePO₄
Battery chemistry
Selected REPT cells
Cell technology
5 / 7 yrs
Lewis warranty*

*Capacity, installation format, monitoring functions, inverter compatibility and warranty depend on the selected model and package. Refer to the applicable datasheet and approved compatibility list.

The TerraVault™ family

Two battery ranges.One connected energy system.

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Lewis TerraVault battery, wall-mounted unit Series 01
Everyday energy storage

TerraVault™

5 · 10 · 16 kWh · LiFePO₄
Capacity options
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Selected REPT cells · clean minimal designDependable energy storage in a Satin Pearl White and Graphite finish.

LEWIS TerraVault™ is our streamlined LiFePO₄ battery range for homes and businesses seeking dependable solar storage without an integrated front display. Available in 5, 10 and 16 kWh capacities, it stores surplus daytime solar energy for use after sunset, during grid interruptions or whenever additional power is required.

Compatible system monitoring may be available through the connected inverter or monitoring platform, depending on the selected configuration.

View datasheet →
Lewis TerraVault Max battery with its integrated display Series 02
Smart monitoring

TerraVault Max™

5 · 10 · 16 kWh · LiFePO₄
Touch display + Wi-Fi connectivity
◎
Battery information at a glanceView charge level, operating status and system alerts directly on the integrated display.

LEWIS TerraVault Max™ combines dependable LiFePO₄ energy storage with an integrated touch display and connected monitoring support. Available in 5, 10 and 16 kWh capacities, it stores surplus solar energy for use after sunset, during grid interruptions or whenever additional power is required.

Wi-Fi connectivity supports convenient remote monitoring through a compatible inverter or monitoring platform, depending on the selected system configuration.

View datasheet →
Why TerraVault™

Storage you candepend on for years.

☀

Store more of your solar energy

Store surplus daytime solar energy for use after sunset, during grid interruptions or whenever additional power is required.

⚑

Dependable backup during outages

When paired with a compatible inverter and correctly designed system, TerraVault™ can support selected essential loads during power cuts or an unstable grid supply.

▤

Selected REPT energy-storage cells

TerraVault™ uses selected REPT LiFePO₄ cells developed for energy-storage applications, supporting consistent and dependable long-term performance.

◈

Stable LiFePO₄ chemistry

LiFePO₄ battery chemistry is designed for stable operation and is widely used in modern residential and commercial energy-storage systems.

✓

5-year standard Lewis warranty

Five years as standard, with up to seven years under the Premium package, subject to the selected model, product registration and applicable warranty terms.

◎

Documented product compliance

Selected TerraVault™ models are supplied with applicable CE or UKCA conformity documentation and supporting product certificates. Refer to the individual datasheet for confirmed approvals.

The range

Two series, three capacities,six models.

The right battery depends on your electricity use, backup priorities and the appliances you want to keep running. Expected runtime is confirmed during system design and depends on battery capacity, inverter rating, connected loads and available solar generation.

TerraVault™Everyday storageAvailable in 5, 10 and 16 kWh
Lewis TerraVault 5 home battery
TerraVault™ 5
5.12 kWh100 AhWall-mounted

Suitable for smaller homes, starter solar systems and selected essential loads.

View datasheet →
Lewis TerraVault 10 home battery
TerraVault™ 10
10.24 kWh200 AhWall-mounted

A balanced option for family homes, evening energy use and broader backup requirements.

View datasheet →
Lewis TerraVault 16 home battery
TerraVault™ 16
16 kWh314 AhFloor-standing

Designed for larger homes, small businesses and properties with greater energy needs.

View datasheet →
TerraVault Max™Smart monitoringAvailable in 5, 10 and 16 kWh
Lewis TerraVault Max 5 home battery
TerraVault Max™ 5
5.12 kWh100 AhWall-mounted

The compact capacity with on-unit visibility of charge level and system status.

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Lewis TerraVault Max 10 home battery
TerraVault Max™ 10
10.24 kWh200 AhWall-mounted

The everyday capacity with on-unit visibility of charge level and system status.

View datasheet →
Lewis TerraVault Max 16 home battery
TerraVault Max™ 16
16 kWh314 AhFloor-standing

The highest capacity with on-unit visibility of charge level and system status.

View datasheet →

Electrical and mechanical specifications are identical across the two series – TerraVault™ and TerraVault Max™ differ only in the front user interface.

Specifications

Two ranges,side by side.

Compare the main differences between TerraVault™ and TerraVault Max™. Final electrical, installation, monitoring and compatibility details depend on the selected model.

Swipe for both ranges →
TerraVault™Everyday energy storageLewis TerraVault home battery TerraVault Max™Smart monitoringLewis TerraVault Max battery with integrated touch display
Battery chemistryLiFePO₄ – lithium iron phosphateLiFePO₄ – lithium iron phosphate
Capacity options5 · 10 · 16 kWh5 · 10 · 16 kWh
Cycle life≥ 6000 cycles @ 80% DOD, 25 °C≥ 6000 cycles @ 80% DOD, 25 °C
Design life≥ 10 years≥ 10 years
Nominal voltage51.2 V · max charge 57.6 V51.2 V · max charge 57.6 V
Ingress protectionIP21IP21
CertificationIEC 62619 report · UN 38.3 · MSDSIEC 62619 report · UN 38.3 · MSDS
Battery cellsSelected REPT energy-storage cells*Selected REPT energy-storage cells*
Integrated displayNo – essential status indicatorsYes – integrated touch display
Wi-Fi monitoringAvailable through a compatible inverter or monitoring platformBuilt-in Wi-Fi connectivity with compatible remote monitoring support
Installation formatWall-mounted or floor-standing, according to modelWall-mounted or floor-standing, according to model
FinishSatin Pearl White · Graphite detailsSatin Pearl White · Graphite details
Inverter compatibilitySelected compatible inverter systemsSelected compatible inverter systems
Product complianceApplicable CE or UKCA conformity documentation, according to model*Applicable CE or UKCA conformity documentation, according to model*
Lewis warranty5 years standard · 7 years with Premium*5 years standard · 7 years with Premium*

*Final cell model, usable capacity, installation format, battery voltage, inverter and BMS compatibility, monitoring functions, conformity documentation and warranty terms depend on the selected model, package and final production datasheet. Remote monitoring requires a compatible inverter or platform and an available network connection.

Downloads

Datasheets,ready when you are.

Download detailed electrical, mechanical, environmental and warranty specifications for each LEWIS battery capacity.

TerraVault™ Everyday storage
⇩
TerraVault™ 5 Datasheet5.12 kWh · 100 Ah · wall-mounted · LiFePO₄ · PDF
PDF · 344 KB
View PDF
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TerraVault™ 10 Datasheet10.24 kWh · 200 Ah · wall-mounted · LiFePO₄ · PDF
PDF · 346 KB
View PDF
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TerraVault™ 16 Datasheet16 kWh · 314 Ah · floor-standing · LiFePO₄ · PDF
PDF · 352 KB
View PDF
TerraVault Max™ 3.5-inch touch display
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TerraVault Max™ 5 Datasheet5.12 kWh · 100 Ah · wall-mounted · touch display · LiFePO₄ · PDF
PDF · 344 KB
View PDF
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TerraVault Max™ 10 Datasheet10.24 kWh · 200 Ah · wall-mounted · touch display · LiFePO₄ · PDF
PDF · 347 KB
View PDF
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TerraVault Max™ 16 Datasheet16 kWh · 314 Ah · floor-standing · touch display · LiFePO₄ · PDF
PDF · 352 KB
View PDF

One datasheet per capacity, per series. Electrical and mechanical specifications are identical across the two series – TerraVault™ and TerraVault Max™ differ only in the front user interface.

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Or choose a complete system

One complete package. Total peace of mind.

Panels, inverter, battery, professional installation and one year of complimentary maintenance support – all specified, supplied and supported by one accountable Lewis team under a single quotation. Choose the Standard or Premium package to suit your energy requirements.

Explore Standard → Explore Premium → AMC plans

Store solar energy. Use it when you need it.

Book a complimentary, no-pressure energy-storage assessment. We'll review your electricity usage, outage requirements, inverter compatibility and backup priorities, then recommend the right TerraVault™ or TerraVault Max™ capacity for your home or business.

Get a free battery assessment Compare TerraVault ranges

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