An Alpha ESS battery stores your solar for the evening, backs up your home when the grid drops, and grows as your needs do. From a retrofit SMILE-B3 Plus to a three-phase hybrid, we size and fit it properly.
If you are looking into an Alpha ESS battery, you have probably already worked out that solar panels on their own are only half the story. The real question is what happens to that energy after it is made, how much of it you keep for yourself, and whether your home stays on when the grid does not.
At Solar4Good we install the AlphaESS SMILE range as part of a properly planned solar and storage system. That means sizing the battery to how your home actually uses power, setting it up to store your daytime solar for the evening, and configuring backup so the changeover is clean the moment a power cut arrives.
What sets AlphaESS apart is flexibility. It is not one sealed box sold at one size. The SMILE range spans a retrofit unit that clips onto solar you already own, single-phase all-in-one hybrids, a three-phase model for larger homes, and a modular flagship you can stack as your needs grow. We match the right one to your property rather than forcing your home to fit a product.
You will work with MCS-certified installers who understand how storage behaves once it is live, from grid paperwork to backup wiring, not a generic checklist.
Start with the storage you need today and add modules as your usage grows, from a single retrofit battery up to whole-home, three-phase and beyond.
The SMILE-B3 Plus AC-couples to any existing solar inverter, so you add storage without ripping out what already works.
Join a virtual power plant and earn from the spare storage you are not using.
An Alpha ESS battery turns your roof into a round-the-clock power supply, charging by day and running your home after dark, through a power cut and into your car.
Most Alpha ESS installs in the UK are shaped by the property, not by preference. Your roof, your consumer unit, whether you already have solar, and how you use power all decide the right setup, and the SMILE range is broad enough to suit most homes.
We fit AlphaESS in three common shapes: a retrofit battery added to solar you already own, a full single-phase solar-plus-storage hybrid, and a three-phase system for larger or higher-demand homes. Every model in the range uses safe LiFePO4 cells and a 95% depth of discharge, so you use nearly all of the capacity you pay for.
Safe lithium iron phosphate cells, a 95% depth of discharge and a modular build, so you start with what you need today and stack more capacity when life changes, rather than paying up front for storage you may never use.
Here is what most battery adverts leave out. On a sunny day your panels make more electricity than the house can use, so the surplus drains back to the grid for pennies. After dark you buy it all back at full price. An Alpha ESS battery stops that leak, and with its UPS backup it does one more thing a cheaper battery often cannot: when the grid goes down, your home stays on.
Because AlphaESS is a range rather than a single unit, the right choice depends on your home. The retrofit SMILE-B3 Plus clips onto solar you already own, while the SMILE-G3, SMILE-T10-HV and modular SMILE5 are full hybrids for new or growing systems. Here is how they compare.
Simple rule: if you already have solar and just want to stop exporting it for pennies, the retrofit SMILE-B3 Plus is usually the cheapest way in. If you are fitting solar and storage together, a SMILE-G3 or modular SMILE5 gives you an all-in-one hybrid you can scale later, and a three-phase home steps up to the SMILE-T10-HV. Across the range the LiFePO4 cells are rated for roughly 6,000 to 10,000 charge cycles depending on the module, so the battery keeps working for years of daily use.
GridSupplier meterSMILE hybrid inverterConsumer unitBatterySolarMost homes are well served by somewhere between 5 and 15 kWh, enough to carry a typical evening and overnight on stored solar. You would size higher if you have high evening use, an EV charging at home, a heat pump, or you want longer whole-home backup. Because AlphaESS is modular, we can start you at the right size and leave room to add capacity later, rather than guessing high.
Yes. Every SMILE model has UPS backup, so a single unit can run your home or your chosen essential circuits when the grid fails, switching over automatically. How much it powers at once depends on your home's demand and the model fitted, which is exactly what we design around during the assessment.
A power cut used to mean candles and a defrosting freezer. With an Alpha ESS battery and its UPS backup, your lights, broadband, fridge and heating carry on, switching over automatically so you barely notice.
This is where AlphaESS differs from a single sealed unit. The SMILE-G3 and SMILE-T10-HV are hybrid inverters, so solar, storage and backup run through one system. And when you already have solar on the roof, the retrofit SMILE-B3 Plus AC-couples to any existing PV inverter, adding storage and backup without ripping out the inverter that already works.
The SMILE range ties your panels, your battery and your backup into one system you monitor from the AlphaESS app, and the VPP-ready SMILE5 can even earn from the grid when the time is right.
An Alpha ESS battery is worth it when you care about two things at once: getting the most out of your solar, and never being left in the dark when the grid fails, without paying for more storage than you actually need.
In a typical UK home solar peaks at midday while demand climbs in the evening. An AlphaESS battery banks the midday surplus and hands it back after dark, and on a smart tariff it can charge from cheap overnight electricity so you run the morning on off-peak power. When the street loses power, its UPS backup switches your home over automatically.
In practice, people tend to choose Alpha ESS because:
For the right home an Alpha ESS battery is very worth it in the UK, but only when it is sized to your real usage and the backup is wired correctly. Oversize it and you pay for storage that sits empty; skip the backup design and you lose the feature you bought it for.
When people ask how much an Alpha ESS battery costs in the UK, they are usually trying to work out what they get for the money, not just the sticker price. The honest answer is that the total depends on your property and the model, not a headline figure.
The cost is shaped by whether you are retrofitting to existing solar or fitting panels at the same time, which SMILE model suits your home, how much electrical work your consumer unit needs, whether you want whole-home or partial backup, and how much capacity you stack. A retrofit SMILE-B3 Plus is usually the cheapest way to add storage, while a full three-phase hybrid sits higher.
Because AlphaESS sits at the value end of the storage market and scales in modules, you can start with the capacity you need now and add more later. Where a battery is added to qualifying solar, 0% VAT applies to the whole system.
The only way to know what an Alpha ESS system would cost for your home is a proper assessment. We look at your usage, your roof and your fuse board, then give you one clear fixed quote rather than a vague range.
From London and the Home Counties out to the Midlands, the South West and the North, our engineers wire home batteries into properties like yours, each one sized and commissioned to last.
Fitting an Alpha ESS battery is not about hanging a box on the wall and hoping. It is about making the battery, your solar, your usage and your backup circuits work together, and signing it all off to UK grid rules.
We install home battery systems right across the UK, alongside every major panel brand, so we know how storage behaves once it is live. With AlphaESS in particular, choosing the right model from the range, and sizing it so it can scale later, is exactly the sort of decision experience gets right.
We size and set up your battery around when you actually use electricity and how often you lose power, not just an annual figure on a bill.
UPS backup only works if it is wired and commissioned correctly. our MCS-registered installers do this day in, day out.
Because AlphaESS is modular, many homes start with the right size today and add capacity later, without reworking the system.
You get an honest view on which SMILE model fits, realistic expectations, and straight answers about cost and payback.
An Alpha ESS install works best when the storage and backup are planned before anyone drills a hole. Most installs follow the same shape, but the final design depends on your property, your existing electrics, and whether solar is already in place.
Understanding how your home uses power We look at how you use electricity across the day, how often you lose power, and what you want the battery to do, whether that is more self-consumption, cheap overnight charging, or reliable backup.
Choosing the right SMILE model We match the retrofit, single-phase, three-phase or modular unit to your home and existing solar, and plan the backup circuits up front rather than bolting them on.
Installing the equipment Most residential battery installs are completed in one to two days by our in-house engineers, with careful attention to wiring, safety and the changeover to backup.
Commissioning and handover We commission and test the system, prove the backup works, and walk you through the AlphaESS app so you can see generation, storage and grid status and set your backup reserve.
Ongoing support After installation we stay available for adjustments, questions and future upgrades, such as adding battery modules as your energy needs change.
A home battery is not just hardware. It is a grid-connected energy system with backup wiring that has to interact safely with your solar, your household electrics, your tariff and the wider UK grid.
When a system like this is installed or configured badly, the problems rarely show up on day one. They appear later as backup that does not switch, limited savings, export issues or warranty headaches.
Working with certified installers reduces those risks, because the system is designed, checked and signed off against UK standards rather than internal shortcuts.
Where finance is part of the setup, FCA regulation sets the rules around how it is offered, so the paperwork, terms and repayment options are handled properly rather than left vague.
MCS certification ties our installs back to recognised UK standards, and keeps systems eligible for Smart Export Guarantee payments once everything is running.
ISO accreditation means the way we install and manage quality is reviewed independently, which helps keep standards consistent from one installation to the next.
Membership with recognised bodies adds an extra layer beyond the installer itself, with insurance-backed protection and independent checks.
Together, these frameworks shape how Alpha ESS installations are planned and supported at Solar4Good, not just how they are sold.
We are a home battery specialist first and foremost. Storage sits at the heart of what we do, and we fit it right across the UK, from our Harrow and Thames Valley heartland out across the Home Counties, London, the Midlands, the South West and the North.
AlphaESS earns its place in that mix for one reason: flexibility. Where some brands sell a single unit, the SMILE range gives us a retrofit battery for homes that already have solar, single-phase and three-phase hybrids for new systems, and a modular flagship that scales, so we can fit the right storage to the home in front of us.
The SMILE-B3 Plus adds storage and backup to solar you already own, which makes AlphaESS an easy upgrade rather than a rebuild.
Start at the right size today and stack more capacity later, so the system grows with an EV, a heat pump or a bigger household.
The SMILE5 is VPP-ready, so where it makes sense the battery can earn from the grid, not just store your solar.
Every battery we fit is installed and commissioned under our own MCS registration, wired for backup and signed off to UK grid rules. Real work, on real UK homes.
The same Solar4Good engineers who design your system are the ones fitting it on your wall.
Every install is completed to MCS and UK wiring rules, then signed off.
We register the system and its warranties so you are protected for the long term.
AlphaESS is a dedicated energy-storage specialist rather than a household name, and that is rather the point. Founded in 2012 and headquartered in Nantong, China, with a UK subsidiary and operations in more than 30 countries, it has more than 150,000 systems running in over 100 countries and is one of the leading virtual power plant providers in the world.
That focus shows in the range. Instead of one premium unit, AlphaESS builds a whole family of LiFePO4 batteries, retrofit, hybrid, three-phase and modular, all sharing a 95% depth of discharge and a 5-year product plus 10-year battery warranty. It is the value and flexibility end of quality storage, not the flashiest badge on the wall.
As with any brand, an Alpha ESS battery is only as good as the way it is installed. A unit sized to your home and wired for backup by a certified installer is a genuinely different thing from a box dropped in without one. Choosing the right model and commissioning the backup correctly is what turns a value product into real-world reliability and savings, and that is our job.
Tell us about your property and we will show you exactly how an Alpha ESS battery would work for you, with one clear fixed quote and no pressure.
Solar4Good installs AlphaESS battery systems across the UK.
Manchester, London, Leicester, Glasgow, Exeter, Birmingham, Coventry, Ipswich, Norwich and Cheshire. Wherever you are, you receive the same Solar4Good quality, care and support.
Find answers to common questions about Alpha ESS batteries, their cost, and installation. If you cannot find what you are looking for, call 0800 999 1454 to speak with our team.
Yes. AlphaESS is a dedicated storage specialist founded in 2012, with more than 150,000 systems running in over 100 countries and a place among the leading virtual power plant providers. The SMILE range uses safe LiFePO4 cells with a 95% depth of discharge and a 5-year product plus 10-year battery warranty.
Yes. The SMILE-B3 Plus is a retrofit battery that AC-couples to any existing PV inverter, so you gain storage and backup without replacing the inverter you already have. It starts at 5.04 kWh and expands to 30.24 kWh.
It depends on the model. The retrofit SMILE-B3 Plus runs from 5.04 to 30.24 kWh, the SMILE-G3 hybrid from 4 to 60.5 kWh, the three-phase SMILE-T10-HV from 8.2 to 49.2 kWh, and the modular SMILE5 from 2.9 up to 80 kWh. We size the right capacity to your home.
Yes. Every SMILE model has UPS backup, so a single unit can run your home or your chosen essential circuits when the grid fails, switching over automatically. How much it powers at once depends on your home's demand and the model fitted.
Yes. The SMILE-T10-HV is a 10 kW three-phase hybrid built for larger homes and higher loads such as heat pumps, while the single-phase SMILE-G3 and SMILE5 cover most other properties.
AlphaESS batteries carry a 5-year product warranty and a 10-year battery warranty in the UK. The 10-year battery cover depends on the system staying connected to the internet for monitoring, and our installation workmanship is covered separately. We confirm the exact terms in writing before installation.
The SMILE range uses lithium iron phosphate (LiFePO4) cells, a stable battery chemistry, with a 95% depth of discharge. Correct installation and commissioning by a certified installer is part of what keeps a home battery safe.
Yes. We are a home battery specialist and fit storage right across the UK, from our Harrow and Thames Valley heartland out across the Home Counties, London, the Midlands, the South West and the North.
