Solar self-consumption
Use your daytime solar generation in the evening instead of exporting it and buying electricity back at peak rates.
Typical uplift: +15-30% of PV value.Home battery storage,
used when it matters.
Store surplus solar generation and use it in the evening instead of buying from the grid, charge on cheaper off-peak rates and, with the right set-up, keep power on during a cut. Our MCS-certified UK team designs, installs and supports every battery.
- 10yrStandard product warranty
- TeslaPowerwall certified installer
- ToUTariff optimisation supported
- MCSCertified battery installer
5-500 kWhDomestic to commercial
Octopus Flux readyAgile / Cosy / IOG scheduling
Whole-home backupIsland-mode capable
0% VAT (homes)Currently, under HMRC relief to 2027
Overview
Batteries sized
Batteries sized
to how you live.
A battery is only as good as the design behind it. We size every system around your half-hourly usage, any solar you already generate and your electricity tariff, so the figures in your proposal reflect your home rather than a generic estimate.
From a 5-15 kWh Tesla Powerwall at home to a commercial 100+ kWh cabinet for peak-shaving, we install battery storage as part of your property’s whole energy system, not as a separate product added to whatever you already have.
Every installation is MCS-registered and covered by RECC, and the battery can work with smart tariffs such as Octopus Flux, Agile, Cosy or Intelligent Octopus Go from the first day.
Why add storage
Four ways a battery
Four ways a battery
adds value.
A battery can contribute in several ways at once. We design for the ones that apply to your property.
Off-peak tariff arbitrage
Charge overnight on an off-peak tariff such as Intelligent Octopus Go, then use the stored energy at peak times.
Use cheaper stored energy at peak times.Backup power
With a backup gateway, the battery can keep your home or selected circuits running during a power cut.
Auto changeover in under 20 ms.Commercial peak-shaving
Reduce peak-demand DUoS and capacity charges on commercial sites with half-hourly settled meters.
Cuts costly demand peaks.
What we offer
Four battery services,
Four battery services,
one team.
From adding a battery to one home to commercial peak-shaving cabinets, one team is accountable for the whole installation.
Home battery
5-20 kWh systems, wall- or floor-mounted, working with your existing solar panels or a new system.
Commercial battery
30-500 kWh cabinets for peak-shaving, tariff arbitrage and backup.
Retrofit or new install
Works with your existing PV inverter (AC-coupled) or as part of a new solar-plus-battery design (DC-coupled hybrid).
Tariff optimisation
We programme your battery for tariffs such as Octopus Flux, Agile, Cosy, Intelligent Octopus Go and EDF GoElectric.
What's in a battery system
What goes into
What goes into
a storage install.
Five components make the difference between a battery that earns its place and one that sits idle.
- 01
Battery pack
LFP chemistry (Tesla Powerwall 3, Sigenergy, Fox ESS), which is generally considered more stable than NMC and offers a longer cycle life.
- 02
Hybrid inverter or AC coupler
A hybrid inverter for a new solar and battery system (one unit for both), or an AC-coupled inverter when adding a battery to existing solar.
- 03
Backup gateway
An automatic transfer switch that islands the whole home or partial loads when the grid goes down.
- 04
CT clamp & meter
Real-time monitoring of import, export and self-consumption, which feeds the battery’s tariff scheduling.
- 05
Tariff scheduler
Works with your chosen time-of-use tariff, so the battery can charge when electricity is cheaper and discharge when it is more expensive.
Battery & energy products
Certified hardware,
Certified hardware,
built to last.
These are the batteries, hybrid stacks and DC charging modules we specify most often for UK homes, businesses and forecourts. Our own MCS-certified team installs and commissions each one.
Intellihouse
A whole-home energy hub for solar, battery and EV charging, with one dashboard and one tariff scheduler.
FlexHome
A wall-mounted, retrofit-friendly home battery, sized at 5-15 kWh to cover the UK evening peak.
SigenStor 1+6
An all-in-one hybrid inverter and stackable battery, with up to 40 kWh for larger homes and light commercial use.
FlexAlo
A modular commercial battery for SMEs and industrial rooftops, suited to peak-shaving and Scope 2 evidence.
PrimePower
A high-output commercial unit for reducing demand charges and serving multi-tenant estates.
EverCore C-ESS
Containerised C&I storage for developers, councils and asset owners, ready for front-of-meter use.
Sigen EV DC Module (1+1+3)
A DC fast-charging module for workplace forecourts: one dispenser, three vehicles charging at once.
Sigen EV DC Module (1+1+2)
A compact DC charging pod for two-bay commercial car parks and destination charging.
Storage by sector
What a battery does
What a battery does
in each sector.
The same technology, with a different case in each type of property.
UK homeowners
Cover the evening peak with solar generation stored earlier, and buy overnight electricity at around 7p/kWh on a suitable tariff.
- 5-15 kWh Powerwall, Sigenergy or Fox ESS
- Octopus Flux / Cosy / Go integration
- Whole-home backup available
- 0% VAT currently on home batteries
C&I energy managers
Reduce peak DUoS and capacity charges, and shave peak demand on half-hourly settled meters.
- 50-500 kWh cabinets
- Peak-shaving & DSR-ready
- Capex, lease or ESA options
- G99 DNO connection managed
Housebuilders & developers
Meet the Future Homes Standard uplift with battery-ready hybrid inverters on new-build plots.
- Battery-ready inverter option per plot
- Post-completion battery add-on
- SAP-ready integration
- CSCS-carded install teams
Councils & public sector
Add resilience to leisure centres, schools and community buildings, and free up grid headroom for EV charging.
- Depot / school portfolio storage
- PPM contracts included
- Experienced with framework procurement
- Auditable Net Zero output
Trust & quality
Solar and storage, installed with care.
For more than 14 years we have helped homeowners across the UK move to renewable energy, with well-installed solar and battery storage systems and attentive customer service.
Inviting installers into your home takes trust. Our team works carefully, keeps disruption to a minimum and treats your property with respect.
Advanced DBS-checked installers
Our installation team has been through Advanced DBS checks, so you know who is working in your home.
A professional, experienced team
Our engineers have years of solar and battery installation experience and take pride in their workmanship and in looking after every customer.
Clean, tidy and respectful installations
We protect your home during the installation, keep the work area tidy and leave your property clean when we finish.
Experienced installers. Trusted people. Quality workmanship.
We aim to make your move to renewable energy straightforward, with clear communication and careful workmanship from survey to handover.
Battery brands
Battery brands
Battery brands
we install.
Choose a brand to see its batteries, key data and why we recommend it. Adding solar as well? See our solar and battery packages.
Tesla
Powerwall 3 with a built-in 11.04kW hybrid inverter, 13.5kWh per unit and expandable to 54kWh, run from the Tesla app.
13.5kWh per Powerwall 354kWh with three expansion packs
View batteries
Sigenergy
SigenStor combines battery, hybrid inverter, energy management and an optional EV DC charger in one stackable tower, from 5kWh up to 48kWh per stack.
5–48kWh per tower10yr product warranty
View batteries
Solis
Solis S6 battery storage from one of the world’s largest inverter manufacturers, with LiFePO₄ batteries and a 10-year product warranty.
5–64kWh capacities available10yr product warranty
View batteries
Sungrow
Modular SBR batteries from 6.4kWh to 25.6kWh, from a manufacturer with over 200GW installed globally.
6.4–25.6kWh modular capacities10yr product warranty
View batteries
Fox ESS
Slim, stackable LiFePO₄ batteries from 5kWh upwards with a 12-year product warranty, backed by a Fortune Global 500 group.
5–30kWh+ capacities available12yr product warranty
View batteries
Talk to our team
Get a battery quote based on your usage.
Share your postcode and tell us about any existing solar. We will model payback against your current tariff and call you back within one working day.
- One-working-day callback from a UK advisor
- MCS-certified design by our in-house UK team
- GDPR compliant, we never sell your details
- Fixed-price quote after a free site survey
Our process
From enquiry to
From enquiry to
first cycle.
Every battery installation follows the same five clear steps.
Step 01
Usage review
We analyse your half-hourly smart meter data to model your usage against different tariffs.
Same dayStep 02
Site survey
One of our own engineers checks your consumer unit, cabling, wall space, ventilation and DNO capacity.
Free of chargeStep 03
Sized proposal
We recommend a battery size, with payback modelled on your actual tariff.
Within 5 daysStep 04
Install & commission
Fitted, wired, backup-tested and MCS-registered in one visit.
1 day typicalStep 05
Aftercare
We set up monitoring at handover and can manage firmware remotely, with a maintenance contract available for the life of the system.
10-year support
Installations
Recent battery
Recent battery
projects.
Home battery storage installed by our own team.
Tesla Powerwall 3, Manor Road, Leicester
Tesla Powerwall 3, Rose Croft, Kenilworth
Sigenergy battery, Braunston, Daventry
27 kWh Powerwall 3 stack, Leicester
Approved installer network
Manufacturer-certified for the brands we recommend.
Tesla Powerwall Certified Installer, with MCS, RECC and TrustMark covering every installation.
“Synergy Power gave me a quote for battery storage and were very good at giving me all the information about the different companies supplying batteries… The system was installed by Ross, who was good, completed the job in good time and left it working, explaining how it all works.”Ramesh, Solihull · Battery storage, via Solar Guide
Frequently asked
Common
Common
battery questions.
Straight answers from our UK design team.
Still have a question?0330 043 1047Do I need solar panels first?
Not necessarily. A battery on its own can still pay its way by shifting your usage to off-peak tariffs such as Octopus Go (around 7p/kWh overnight, compared with price-cap peak rates). Solar and a battery together usually work best, but a battery alone makes sense for many UK homes.
How big should my battery be?
It depends on your daily consumption, the size of your solar system and your tariff. For many UK homes on Octopus Flux, 10-13.5 kWh is a common size. Our design team works it out from your half-hourly meter data as part of the free assessment.
Does a battery give me backup power?
Many modern batteries can, with the right equipment. Tesla Powerwall 3 and Sigenergy (with the Sigenergy Gateway) both offer whole-home backup with automatic changeover, quoted at under 20 milliseconds, when the grid drops. Tell us if backup matters to you and we will design for it.
What tariffs work best with a battery?
Time-of-use tariffs such as Octopus Flux (import and export), Cosy Octopus (three cheaper windows), Intelligent Octopus Go (around 7p overnight for EV owners) and EDF GoElectric. You switch tariff with your energy supplier yourself, and as an Octopus Energy Trusted Partner we can give you the information you need.
Do I get 0% VAT on a battery?
Currently, yes, for homes in Great Britain. Under HMRC's energy-saving materials relief, battery storage installed in residential accommodation is zero-rated until 31 March 2027, whether it is fitted with new solar or added to an existing system.
How long do batteries last?
LFP batteries such as Powerwall 3 and Sigenergy are designed for a long cycle life. Warranties typically run for 10-12 years with 70-80% capacity retention; we confirm the terms for your chosen battery in your quotation.
Can I add a battery to my existing solar panels?
Usually, yes. We can add a battery to most existing solar systems, including ones we did not install, using an AC-coupled or hybrid inverter. We check compatibility at survey.
Do I need DNO approval for a battery?
Smaller systems are usually connected and then notified to your Distribution Network Operator under G98. Larger systems need a G99 application approved before connection. Whether and how a battery counts towards those limits depends on the equipment, so we confirm it at design stage and handle the paperwork.
How do I monitor my battery?
We set up the manufacturer’s monitoring app at handover, so you can see charge level, solar generation, import and export on your phone, and we show you how to adjust the schedule.
Take control of your energy.
A free battery sizing consultation, with payback figures modelled on your own meter data.