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Commercial battery storage
Battery Storage for Businesses in London
A commercial battery stores electricity when it is cheap or plentiful and releases it when your site needs it most. For most businesses that means three things: using more of your own solar, drawing less from the grid at the most expensive times of day, and keeping essential equipment running in a power cut.
We design commercial battery systems around your half hourly consumption data, install them with new or existing solar, and handle the grid connection. Buy the system outright, or pay nothing upfront through a power purchase agreement.
- MCS certified for battery storage
- TrustMark
- RECC
- NAPIT
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What a business battery does
Uses more of your solar
Solar output peaks around midday, but many sites keep using power into the late afternoon and evening, or produce more at weekends than they use. A battery holds that surplus for later instead of exporting it.
Cuts peak time network charges
Half hourly metered sites pay network charges in red, amber and green time bands, and the red band (usually weekday late afternoon and early evening) costs many times the green. A battery charged from solar or overnight can cover the red band so the site draws less from the grid when it costs most.
Keeps demand under your supply capacity
Most larger sites pay for an agreed supply capacity, with extra charges if demand goes over it. A battery can trim short peaks, such as machinery starting up or EV chargers coming on together, so the site stays within its limit.
Backup for essential circuits
With the right inverter and switching, a battery can keep selected circuits running in a power cut: tills, servers, refrigeration, security, lighting or anything else you cannot afford to lose. We agree with you which loads matter and design the backup around them.
How much a battery is worth depends on your consumption pattern, your tariff, the size of your solar system and where you are on the network: network charges vary by region and change every April. We do not quote savings until we have modelled them from your own data.
Is a battery right for your site?
A battery tends to earn its place where several of these apply:
- you have solar, or are installing it, and export a meaningful share of what it generates
- your site keeps using power after the solar output falls away in the afternoon
- you are half hourly metered and a large part of your bill falls in the red time band
- you regularly come close to, or go over, your agreed supply capacity
- a power cut would stop the business or cost you stock, data or trade
If none of these apply, we will say so. Sometimes the better investment is a larger solar array, a tariff change or simply moving when certain equipment runs.
With new solar, or added to existing solar
Installed with new solar
The simplest route. A hybrid inverter runs the panels and the battery together, and the whole system is designed and connected in one application to the network operator. See commercial solar panels.
Added to an existing system
If you already have solar, a battery can usually be added with its own inverter alongside the existing one, or by replacing an ageing inverter with a hybrid. We check the existing system first, including systems we did not install. See commercial solar maintenance.
Design, safety and compliance
Sizing from your data
Battery capacity and power are sized from your half hourly consumption and solar generation, not from a rule of thumb. Single and three phase supplies, with systems designed to grow if your demand does.
Where the battery goes
Location is assessed on every site: ventilation, temperature, fire separation from escape routes and other risks, access for maintenance, and anything your insurer requires. We recommend telling your insurer before installation.
Grid connection
Most commercial batteries need a G99 application to the network operator, which we prepare and submit. The operator can set limits on export. Our guide to commercial solar and G99 explains the process.
MCS and larger systems
Battery systems up to 50 kW are installed and certified under the MCS battery standard. Larger systems follow the same design and installation standards and always go through a full G99 application.
Buy it, or pay nothing upfront
Buy the system
You own the battery, the inverter and any solar from day one. Commercial installations carry standard rate VAT, which VAT registered businesses can normally reclaim, and the equipment may qualify for capital allowances. Your accountant will confirm what applies to you.
Power purchase agreement (PPA)
Solar and battery storage installed with no upfront cost to you, maintained for the length of the agreement, and you pay a fixed rate for the solar electricity your site uses. Every PPA site is assessed and approved first, and we explain the full terms in your proposal.
Recent commercial battery installation
A pub in NW6: solar and three phase battery storage
Seventeen 450W panels across two roof planes, a three phase hybrid inverter and modular battery storage, connected through UK Power Networks. Installed while the building was closed for a full internal refurbishment, working around the main contractor's scaffold and an electrical installation that was still being finished.
Common questions
Can a battery power the whole site in a power cut?
Usually a battery backs up selected essential circuits rather than the whole building, because heavy loads would empty it quickly. Some systems switch over in a fraction of a second, others take a few seconds, so equipment that cannot tolerate any interruption may still need its own UPS. We go through this with you at the design stage.
Can we charge the battery from the grid overnight?
Yes, where your tariff makes it worthwhile. Many business batteries charge from solar during the day and top up from the grid at off peak times, then discharge through the expensive part of the day. The control settings are set up to suit your tariff and operating hours.
Which battery brands do you install?
We choose equipment for each project based on the size, supply, location and backup requirements of the site, and explain the options in your proposal. Our product range changes as better equipment becomes available.
Do we need permission from the network operator?
Yes. Batteries count as generation for grid connection purposes, so most commercial systems need a G99 application. We prepare and submit it as part of the project.
Does a PPA cover batteries as well as solar?
Yes. A PPA can include battery storage alongside the solar, subject to the site being assessed and approved. We set out the purchase and PPA options side by side in your proposal.
Which areas do you cover?
All of London and roughly 50 miles around it.
Find out whether a battery makes sense for your site
Send us your site details and, if you have it, your half hourly data. Tick battery storage on the form and we will model it with your solar. We reply within one working day.
Solar Panels London. Last reviewed 11 November 2026. Standards referenced: MCS MIS 3012 (battery storage) and ENA Engineering Recommendation G99. Network charges are set by each distribution network operator and change every April. VAT and capital allowance treatment depends on your business; check with your accountant.
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SOLAR PANELS LONDON (SPL) LIMITED, registered in England and Wales, company number 14360308. Registered Office, 20 Rosslyn Crescent, Luton, LU3 2AU. SOLAR PANELS LONDON (SPL) LIMITED is an Introducer Appointed Representative of Shermin Finance Limited, FRN 727594, company number 01276121. Registered Office, Homeserve, Cable Drive, Walsall, WS2 7BN. Shermin Finance Limited act as a credit broker and is not a lender. Credit is subject to status and affordability.