M&E Contrax Resources

Commercial Battery Storage

Resource Highlights:

Commercial battery storage stores electricity and releases it when your site needs it most.

Batteries can increase solar self consumption, reduce peak grid demand, and improve energy control.

Suitability depends on your load profile, site infrastructure, and system design.

DNO considerations may apply, especially if the battery can export to the grid.

Good safety planning, commissioning, and monitoring are essential for long term performance.

A practical guide for businesses considering battery systems

Commercial battery storage is increasingly being used by UK businesses to improve energy control, reduce reliance on the grid, and make better use of on site generation such as solar PV. A battery system stores electricity for later use, allowing you to shift energy to the times your site needs it most.

For some businesses, the priority is using more solar energy on site. For others, it’s about managing peak demand, improving resilience, or building a smarter energy strategy as electricity use grows.

This guide explains how commercial batteries work, what they can do for a business, and what to check before you invest.

What is commercial battery storage?

Commercial battery storage is a system that stores electricity in a battery, usually lithium based, and then supplies that electricity back to the site when required.

A typical commercial setup includes:

battery units (often modular)

a battery inverter or hybrid inverter

control system and monitoring

protection and isolation equipment

optional integration with solar PV or other generation

Batteries can be installed alongside solar PV, or as a standalone solution depending on your goals.

Why businesses install battery storage

Different businesses install batteries for different reasons. The most common benefits include:

Use more solar on site

If you have solar PV, batteries can store surplus energy generated during the day and release it later, for example:

evening operations

early morning demand

weekends or shift changes

This can increase self consumption and reduce wasted export.

Reduce peak demand

Many businesses have short periods where electricity demand spikes, for example when machinery starts, refrigeration cycles, or multiple systems run at once. Batteries can help reduce peak demand by supplying power during those spikes.

Improve energy control and predictability

A battery can help stabilise grid import and make your energy usage more manageable. This can be useful for sites looking for better budgeting and long term planning.

Support electrification

As businesses add:

EV chargers

electric heating

heat pumps

more electric plant

Battery storage can help balance demand and reduce strain on the supply.

Improve resilience

Some battery setups can support limited backup capability for critical loads, depending on system design. This needs careful planning, not every battery system provides backup automatically.

How commercial batteries work with solar PV

With solar, the usual priority order is:

Solar powers the building first

Surplus solar charges the battery

Once the battery is full, surplus may export to the grid (depending on settings and permissions)

When solar drops, the battery supplies the site before the grid fills the gap

This is one of the simplest ways to increase solar value, but the battery must be correctly sized and configured.

Is your business suitable for battery storage?

Battery storage tends to work best where there is:

consistent energy use outside daylight hours

regular peak demand periods

solar generation that produces surplus in the day

a clear goal, cost control, self consumption, peak reduction, resilience, electrification support

It can be less effective where:

energy use is already low and simple

the site is only occupied during solar generation hours and already uses most solar

the electrical infrastructure limits battery integration without upgrades

A proper review of your site’s energy profile is the right starting point.

Commercial battery sizing

Sizing is not just “bigger is better”. A commercial battery should be sized around your goals.

Key sizing inputs include:

your daily load profile, when you use power

how much surplus solar you generate

peak demand events and their duration

whether you want backup for critical loads

your site supply limitations and export permissions

A good installer should size the system using real data, not assumptions. If you have half hourly data or smart meter data, that can be very useful.

DNO approval and export considerations

Commercial batteries may need DNO notification or approval, especially if:

the battery can export to the grid

the site has a three phase supply

the system is large

the inverter setup changes your site’s export capability

Batteries can often be configured to:

prevent export entirely

limit export to an agreed value

prioritise self consumption

If you want to understand this in more detail, see our guide:
DNO approval explained

Safety and installation planning

Commercial battery storage needs proper safety and compliance planning.

A professional installer will consider:

location, ventilation, access and clearances

fire safety and risk assessments

isolation and emergency shutdown

signage and documentation

commissioning and monitoring setup

safe cable routes and protection

Battery systems should be installed with long term maintenance access in mind, not squeezed into awkward spaces.

The installation process

A typical commercial battery project includes:

Energy review and site survey

We review your energy usage, goals, and existing infrastructure.

System design and proposal

You receive a clear design that explains what the battery will do, how it will operate, and what is included.

Permissions and approvals

Where needed, we support any required DNO processes and export settings.

Installation and commissioning

The system is installed safely and commissioned correctly, with monitoring and controls set up.

Handover and support

You receive documentation and clear guidance on how to monitor performance, plus aftercare options.

Frequently Asked Questions

No. Batteries can be installed without solar, but many businesses see the most value when batteries are paired with solar PV and designed around self consumption and site demand.

It can, but it depends on your usage pattern, tariff, and how the battery is configured. The best answer comes from a site specific review.

Some can, but export is subject to system settings and network permissions. Many businesses choose to limit export and prioritise on site use.

Sizing should be based on your site’s load profile, peak demand, and goals. A survey and usage review will provide the clearest recommendation.