Home Battery Storage

Store energy on your terms.

Charge during low-cost periods, store solar surplus, use energy when grid prices are higher, and support selected backup functions where your system is designed for it.

Home battery storage system in a utility room
Solar surplus storage
Off-peak tariff charging
Backup capability options
Modular and expandable

How your battery manages energy through the day

A typical daily energy flow for a solar-paired home battery system

6 am – 12 pm
Solar generation begins
Panels produce power from early morning. The home draws directly from solar first, with surplus directed into the battery to begin charging.
12 pm – 4 pm
Peak generation window
Maximum solar output. Battery reaches full capacity. Excess generation is exported to the grid where permitted and tariff conditions allow.
4 pm – 10 pm
Evening demand covered
Solar generation reduces. The battery discharges to cover evening household demand — typically the highest-cost period on variable tariffs.
10 pm – 6 am
Off-peak grid charging
Where a time-of-use tariff is active, the battery recharges from the grid at off-peak rates overnight, ready for the next day's cycle.
System Sizes

System capacity options

Battery capacity is sized to your daily energy use, solar system output and whether backup capability is part of the brief.

5 kWh Battery System
Indicative installed price: from £4,600 (UK) / from €5,500 (Europe)

Entry-level storage suited to smaller households or systems primarily focused on solar self-consumption. Covers partial evening demand.

  • Assessment & design
  • Battery and inverter supply
  • Installation
  • Commissioning
Request a Project Quote
10 kWh Battery System
Indicative installed price: from £7,500 (UK) / from €9,000 (Europe)

Medium household with 3,500–5,000 kWh annual demand. Covers most evening usage and enables meaningful off-peak tariff benefit.

  • Assessment & design
  • Battery and inverter supply
  • Installation
  • Commissioning
Request a Project Quote
15 kWh Battery System
Indicative installed price: from £11,000 (UK) / from €13,000 (Europe)

Larger household demand or a system designed to include partial backup capability. Works well alongside larger solar arrays and heat pumps.

  • Assessment & design
  • Battery and inverter supply
  • Installation
  • Commissioning & backup configuration
Request a Project Quote
20 kWh+ Modular System
Indicative installed price: Project budget on assessment

High-demand property, whole-home backup brief, or expansion of an existing battery system. Modular architecture allows capacity addition over time.

  • Full site assessment
  • Custom system design
  • Modular battery supply
  • Installation & commissioning
Request a Project Quote

Prices shown are indicative market ranges for equipment and a standard professional installation. Final pricing depends on country, VAT treatment, property condition, system capacity, electrical works, roof or building access, permits, grid requirements and project scope.

Use Cases

Self-consumption and backup — two different design briefs

Most home batteries are optimised for self-consumption. Backup capability requires a different inverter configuration and is designed in from the outset.

Self-Consumption Optimisation
The most common battery use case. The system stores solar generation and off-peak grid electricity, then discharges during peak demand periods to reduce the amount purchased from the grid at higher rates.
  • Compatible with most hybrid inverters
  • Works with time-of-use tariffs (Octopus Intelligent, etc.)
  • Sized to daily demand and solar output
  • No additional transfer switching hardware required
  • Most cost-effective entry point for battery storage
Backup Power Capability
A subset of systems can be designed to maintain power to selected circuits during a grid outage. This requires specific inverter models, an automatic transfer switch, and defined load circuits — all confirmed at design stage.
  • Requires compatible inverter with backup output
  • Transfer switching hardware adds to system cost
  • Whole-home or selected-circuit backup options
  • Battery capacity requirement increases for backup load
  • Discussed and confirmed during the design review
Equipment

Representative battery systems considered for LUMIXIS projects

Equipment is selected by project and system design. Individual models are not sold separately.

Tesla
Powerwall 3
13.5 kWh · 11.5 kW peak · integrated inverter
All-in-One
View Technical Details
Huawei
LUNA2000 S1-100
5–15 kWh modular · 5 kW AC · LUNA3 compatible
Modular
View Technical Details
BYD
Battery-Box Premium HVS
5.1–12.8 kWh · high-voltage · 200A peak
High Voltage
View Technical Details
sonnen
10 performance+
10 kWh · integrated inverter · community tariff
Smart Tariff
View Technical Details
Alpha-ESS
SMILE-B10
10.1 kWh · 5 kW AC · 6000 cycle life
Long Cycle
View Technical Details
GivEnergy
All-in-One 9.5 kWh
9.5 kWh · 3.6 kW inverter · hybrid
UK Popular
View Technical Details
Growatt
ARK 10.0H-A1
10.24 kWh · high-voltage · expandable
Expandable
View Technical Details
EcoFlow
DELTA Pro Ultra
6–60 kWh modular · V2H capable · off-grid
V2H Capable
View Technical Details
SMA
Sunny Boy Storage 3.7
3.7 kW · multi-battery compatible · AC-coupled
AC-Coupled
View Technical Details
Pylontech
Force H2
7.1 kWh per unit · stackable · industry standard
Stackable
View Technical Details
Common Questions

Compatibility and expandability

The most common questions about battery storage projects answered before the assessment.

Can a battery be added to an existing solar system?
In many cases, yes — but compatibility depends on the existing inverter. AC-coupled batteries can work with most solar inverters through a separate battery inverter. DC-coupled systems require a hybrid inverter and are typically designed from the outset. We review the existing installation before recommending a route.
Which inverters are compatible with each battery?
Compatibility is battery-specific. High-voltage batteries such as the BYD HVS require a compatible hybrid inverter. Some batteries such as the Tesla Powerwall 3 include an integrated inverter and operate independently. Compatibility is confirmed during the system design stage, not assumed from a product list.
Can battery capacity be expanded later?
Several systems are designed for modular expansion. The Huawei LUNA2000, BYD Battery-Box HVS, Growatt ARK and Pylontech Force H2 all support adding capacity units to an installed system. Expansion limits and conditions vary by model and are confirmed at design stage.
Does a battery provide backup power during an outage?
Not automatically — backup capability is a specific system design requirement. It requires an inverter with a dedicated backup output, automatic transfer switching hardware, and defined load circuits. Systems not designed for backup will not maintain power during a grid outage. If backup is part of your brief, it is addressed in the initial design review.

Store energy on your terms. Design a system around your home.

Start with an enquiry and we will assess your property, solar output and demand profile to recommend the right battery configuration.