~5 kWh and up
Homes
A smaller starting point.
Home storage can start at around 5 kWh, subject to the product range, with larger or modular options to suit your usage, tariff and future plans.
Try a home example →Battery storage for homes & businesses
Store at the right time.
Use it when it matters.
From home systems around 5 kWh to commercial cabinets and container-scale storage. Explore batteries on their own or alongside solar, with expansion and backup options designed into the specification.
No solar requiredModular optionsBackup available by design
01Home batteries
02Commercial storage
03Modular & stackable
04Gateway & backup options
Choose capacity for a reason
One technology.
Very different scales.
The right battery starts with the energy you want to shift, the power you need at one time and the available supply. More capacity is useful only if your site can charge it and use it effectively.
kWh to larger systems
Commercial buildings
Built around business demand.
Modular stacks and cabinet systems for commercial sites, assessed against operating hours, demand data, charging capacity and the role storage will play.
Try a commercial example →MWh scale projects
Large commercial & industrial
Container-scale energy.
Larger containerised battery projects need a site-specific engineering assessment covering supply, layout, access, fire strategy, connection requirements and operating controls.
Explore a large-system example →UK day / night tariff calculator
What could cheaper
overnight charging save?
Enter your actual day and night rates in pence per kWh. We estimate the value of shifting electricity through a battery, allowing for losses and limits—not simply multiplying the tariff difference by battery size.
Start with an editable example:
Illustrative home example. Rates are editable examples, not live UK tariff offers.
How this calculator works
Daily energy delivered is the lowest of usable capacity after your extra backup reserve, charging power × cheap hours × round-trip efficiency, discharge power × the day-use window, and the day-rate demand you entered. Capacity is treated as usable discharge energy for this initial estimate; actual AC-deliverable energy should be confirmed.
Grid energy bought overnight = energy delivered ÷ efficiency. Day-rate cost avoided minus overnight charging cost and additional standby cost gives the daily saving. Annual saving = daily saving × equivalent use days, minus the other annual cost change. Negative results are shown rather than hidden.
This simple model cannot establish the right size for a business or home. Actual load timings, simultaneous demand, charging schedules, system settings and tariff terms need a further review. Read independent battery-storage guidance from Energy Saving Trust.
Build in the option to grow
Stackable systems.
A considered expansion plan.
Many battery ranges use modular packs that stack or connect into larger systems. This can let the design grow with your needs, within the manufacturer’s approved configuration.
Add storage where the range allows.
Different module sizes, maximum stack heights and approved parallel arrangements mean expansion is product-specific. Physical space, age compatibility and warranty conditions need to be considered before promising future additions.
More kWh does not always mean more kW.
Extra modules may increase the energy stored without increasing the inverter’s charging or discharge power. We assess both how much energy is needed and how quickly the site must use it.
Power-cut protection, specified properly
Backup starts
with the right design.
Suitable battery systems can be installed with a compatible gateway or other approved backup switching arrangement, allowing the system to support agreed loads during a power cut.
Backup is an option to specify, not a feature of every battery installation. The gateway, wiring, supported circuits, available power and reserve all need to be designed together.
Discuss your backup needsChoose the loadsAgree whether the aim is essential circuits or a broader home or site arrangement.
Match the powerCheck simultaneous demand, starting loads, phases and the equipment’s backup limits.
Keep a reserveHolding energy for outages reduces the capacity available for everyday tariff shifting.
Battery-only installations
No solar panels?
You can still consider storage.
A suitable battery and inverter can charge from the grid during cheaper periods and supply eligible loads later. Solar panels are not a requirement. If you may add solar later, that needs to be considered when choosing the equipment.
The case depends on your actual tariff spread, system losses, usable demand and installation cost. Moving existing consumption directly into cheap hours can also be worth considering.
From household to procurement team
Traceable equipment.
A clear project scope.
Our manufacturer and supply-route traceability commitment applies to battery storage too. We agree the equipment specification, warranty information, installation responsibilities and any project-specific ESG evidence requirements.
Read our equipment commitment →Project locations
Battery storage across the region.
Explore projects in Cambridgeshire, Lincolnshire, Norfolk, Suffolk, Northamptonshire and Hertfordshire, with enquiries also welcome for Buckinghamshire and Essex. Include your site postcode so the location and project requirements can be reviewed.
Explore areas and project optionsTell us about your site and objectives. We’ll review your enquiry and confirm the proposed installer, scope and delivery arrangements before you commit to a project.
Let’s size it around your needs
From a home battery
to a commercial energy asset.
Tell us what you want the battery to do: use a night-rate tariff, store solar, support a commercial load or provide backup. Your calculator scenario can carry straight into this enquiry.
Useful starting points
Your postcode, electricity usage, day and night rates, any existing solar or battery equipment, and whether power-cut backup is important.
For commercial and container-scale projects, load data, supply capacity and operating hours help establish whether the opportunity is worth developing.
Battery storage, explained
Before you choose
your system.
Can I install a battery without solar?
Yes, with equipment and an electrical design suitable for grid charging. Battery-only systems can use eligible cheaper periods and discharge later. The tariff, losses, demand and installed cost need to make sense together.
Are all batteries stackable?
No. Many ranges have stackable modules or other approved expansion options, but others use fixed-capacity units. Expansion limits, equipment compatibility, age differences and warranty conditions depend on the manufacturer.
Can the system include a gateway for power cuts?
A compatible gateway or approved backup arrangement can be specified for suitable systems. We need to agree the loads to support, phases, available power, switching arrangement and reserve. A battery on its own does not guarantee backup.
Do you cover both 5 kWh home systems and container batteries?
We consider home systems starting around 5 kWh, larger modular and cabinet systems, and container-scale commercial projects. The product range and final capacity are selected following the site and demand assessment.
Does the calculator show a guaranteed saving or payback?
No. It is a tariff-shifting energy-bill scenario based on your inputs. It includes the entered efficiency, reserve, charging and demand limits, and any running-cost change you add. It does not include purchase or installation cost, degradation, finance, replacement or future tariff changes, so it is not a project payback calculation.
What if the battery cannot fully charge overnight?
The calculator limits the energy shifted using your charging power and cheap-rate window. In practice, other overnight loads, equipment settings and the electrical supply may reduce the power available. These need to be reviewed in the design.
Is the calculator using a particular UK tariff?
No. The example day/night prices are editable assumptions, not a supplier recommendation or live offer. Use the rates, eligible hours and terms available to your own home or business.
Our service areas
Storage for homes and businesses across the region.
Cambridgeshire, Northamptonshire, Lincolnshire, Norfolk, Suffolk, Buckinghamshire, Hertfordshire and Essex.
Discuss your battery project →