The SMILE-G3: One intelligent system for solar, storage and home energy control

SMILE-G3 brings compatible solar generation, modular battery storage, intelligent monitoring, tariff-led charging and optional backup together within one connected, quality-focused AlphaESS home energy system.

With a choice of inverter and battery configurations, an authorised installer can design the system around your household energy use, property and future plans. AlphaESS UK supports installers with product training, technical guidance, commissioning assistance and clear escalation routes, helping them provide homeowners with a professional installation and exceptional ongoing aftercare.

SMILE-G3 PRODUCTS

Build Your AlphaESS Home Battery Storage System

SMILE-G3 systems can be configured with compatible inverter and battery options to meet different household energy needs. Your authorised installer will assess the electrical supply, solar array, consumption, available space, tariff strategy and backup priorities before recommending a system.

Why the SMILE-G3 stands apart

SMILE-G3 brings compatible inverter, battery, monitoring and backup options together within a professionally designed home energy system. Modular configurations allow an authorised installer to design the system around the property, household demand and future energy plans.

The SMILE-G3 delivers uninterruptible power with intelligent modular design and 24/7 monitoring. Its 10-year, 10,000-cycle warranty stands among the strongest in the market.

Rated IP65, the system works indoors or outdoors with 200% PV input capability. Off-grid operation comes standard, whether for planned use or emergency backup.

Add 10 kWh battery modules as your needs evolve, using plug-and-play installation. The building-block approach means you can expand without disrupting what already works.

INTELLIGENT

Monitor and optimise from anywhere

EXPLORE ALPHACLOUD APP

Through the AlphaESS App, powered by AlphaCloud, users of compatible SMILE-G3 systems can view energy flows, battery status, system performance and available settings. Functions vary by installed model, configuration, connectivity and account permissions.

Remote Control

Manage your battery from anywhere using the dedicated mobile application.

Smart optimisation

The system predicts demand and positions itself for maximum efficiency daily.

THE COMPLETE PACKAGE

One connected
home energy system

SMILE-G3 brings compatible solar generation, battery storage, household demand, grid exchange and backup equipment together in one professionally designed system.

Integrated system design

Compatible inverter, battery and energy management functions work together within the selected SMILE-G3 configuration.

Solar and storage management

Store available solar generation and use it around household demand and configured energy priorities.

Compatible backup options

Add backup capability using compatible AlphaESS equipment and an appropriate electrical configuration.

Tariff and EV integration

Explore compatible tariff strategies and EV charging options as part of the complete home energy system.

SMARTER HOME ENERGY

Make your stored energy work harder

A compatible SMILE-G3 system can work with selected smart tariffs and energy integration partners to optimise when electricity is stored and used.

Depending on your system, tariff, partner service and eligibility, this could help you charge your battery during lower-cost periods, reduce peak-time grid use and explore opportunities to earn rewards by supporting the wider electricity network.

HOME ENERGY

Compatible AlphaESS home batteries can work with supported Octopus Energy smart tariffs, helping households charge, store and use electricity around selected tariff periods. AlphaESS systems can also form part of eligible Octopus Zero Bills Homes.

ABOUT OCTOPUS

HOME ENERGY

The Levelise Hub connects with compatible home battery systems to optimise battery charging, performance and everyday energy use. Eligible households can also participate in supported flexibility services, creating opportunities to receive payments for helping balance the electricity network.

ABOUT LEVELISE

HOME ENERGY

Axle Energy connects compatible AlphaESS home batteries with grid flexibility services. During selected periods of electricity system stress, eligible batteries can export stored energy to support the grid, allowing participating homeowners to earn rewards while retaining control of their normal battery schedule.

ABOUT AXLE

SCALABILITY BUILT IN

What the SMILE-G3 Range delivers

Potential independence from grid volatility and rising energy costs, protection when outages strike and the flexibility to expand as your home evolves.

Energy Independence

Generate and store your own power, reducing reliance on grid supply.

Measurable savings

Lower bills through optimised charging and strategic discharge timing.

Outage protection

Stay powered during blackouts with an automatic backup gateway as an additional feature.

Scalable growth

Expand capacity later without replacing your entire system infrastructure.

PERFORMANCE

The numbers that matter most

The SMILE-G3 range delivers consistent performance across every metric. Round-trip efficiency reaches 94%, meaning more of your stored energy returns when you need it. A 10-year warranty covers the battery, giving you confidence in your investment.

94

Round-trip
Efficiency

10

Warranty
Coverage

10000

Cycle Lifespan
Rating

RATED 4.8 ON TRUSTPILOT

Don’t just take our word for it. See what our customers have to say about their experience with us on Trustpilot.

EXPLORE

Great System - Great Support

Had an AlphaESS solar, battery, evc system fitted. Works beautifully from day one. Had one support issue so far and was answered within 5 seconds by a human (thanks Jack) who diagnosed and solved the problem in that call, using product knowledge not a sterile script. Highly recommended.

Mr Daniel Pollick
UK Installation

Second to none - 5 Stars

We’ve been installing Alpha ESS systems for the last 12 months and have been really impressed with the products and the support behind them. The systems are straightforward to install, the commissioning process is user-friendly, and the monitoring platform is simple for customers to understand and use. From an installer’s perspective, the technical support has also been excellent whenever we’ve needed assistance...

NovaSol Energy Ltd
UK Installer

Amazing aftercare and customer support

AlphaESS are the best . We are renegade solar and installed over 30 solar And Battery Installations and have used alpha for the bulk of these. 1 They always answer the phone . Hugely important when trying to commission or if you have a problem, they always help to resolve them. The team at AlphaESS UK have a vast amount of knowledge and experience. The technical team Jac, joe and lewis have been fantastic for us and would like to personally say thank you for all your help and support over the years .

Ashley Merritt
UK Installer

The Little Guys Matter!

I don't normally leave reviews, but on this occasion I actually asked if I could write one because the support I've received has been exceptional. The level of customer service has been far beyond anything I expected. Every query has been answered promptly, and the team has always been knowledgeable, professional, and genuinely friendly. It's refreshing to deal with a company that takes the time to help and clearly cares about its customers. As someone relying on their support for my inverter and battery system, it's reassuring to know that whenever I've needed assistance, they've been quick to respond with clear, helpful advice.

procgen
UK Customer

I am very happy with my battery system

I am very happy with my battery system. The installation was very good and now the house is using much more energy from the solar panels. Before, a lot of energy was going back to the grid but now we can store it and use it in night. The system work very quiet and the app is very good and easy to use even for me. The tech support line has been very helpful when I had question. They answer quick and explain everything with patience. For me it is a very good investment I recommend Alpha ESS to anyone who wants to save energy and use more of their own solar power.

Luis Carlos
UK Customer

FAQs

What equipment makes up a SMILE-G3 system?

A SMILE-G3 system combines a compatible AlphaESS hybrid inverter with modular battery storage, system monitoring and intelligent energy management. Depending on the property and selected configuration, it can also connect with solar PV, supported smart tariffs, an EV charger and optional backup equipment.

How are inverter power and battery capacity selected?

Inverter power and battery capacity perform different roles. Inverter power determines how much electricity the system can supply at one time, while battery capacity determines how much energy can be stored.

An authorised installer will assess your electricity supply, household demand, solar array, tariff, backup priorities and future plans before recommending a compatible combination.

Can SMILE-G3 work with an existing solar installation?

Potentially. Compatibility depends on the existing solar equipment, electrical arrangement, available connection capacity and the selected SMILE-G3 configuration.

An authorised installer must assess the existing system and determine whether it can be retained, adapted or incorporated through an appropriate system design.

Can battery capacity be expanded later?

Compatible SMILE-G3 configurations can support future battery expansion. Any additional modules must remain compatible with the installed inverter, existing batteries, system design and current AlphaESS technical requirements.

An authorised installer should always assess and complete the expansion.

Does every SMILE-G3 system provide backup power?

No. Backup requires compatible AlphaESS equipment and an electrical arrangement designed for the loads that must remain powered.

Available power and backup duration depend on the inverter, battery capacity, state of charge and connected loads. Do not assume backup will automatically cover the entire property.

Can SMILE-G3 work with smart tariffs and integration partners?

Compatible SMILE-G3 systems can support selected smart tariffs and approved energy integration services. These can help schedule battery charging and discharging around tariff periods or eligible grid flexibility events.

Available functions depend on the installed equipment, software, communications, tariff, partner service and customer eligibility. Financial savings or rewards cannot be guaranteed.

Explore Integration Partners

Who installs and supports a SMILE-G3 system?

Professional installers design, install and commission SMILE-G3 systems. Your installer will assess the property, recommend the system, complete the installation and explain how it operates.

AlphaESS UK supports its installer network with product training, technical guidance, commissioning assistance, documentation and escalation routes. Monitoring guidance and customer support are also available to help provide a clear aftercare journey following installation.

Learn more about Backup Gateway

Is home battery storage safe?

Home battery systems are designed with multiple layers of protection, including battery monitoring and safety controls. Safe performance also depends on correct product selection, positioning, installation and commissioning. Always use an appropriately qualified installer and follow the manufacturer’s operating and maintenance guidance.

Ready to install your SMILE-G3?

Connect with an authorised AlphaESS installer who can assess your property, explain the available options and recommend a compatible home energy storage system.

FIND AN INSTALLER

The SMILE-G3: One intelligent system for solar, storage and home energy control

View Inverter Range

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Build Your AlphaESS Home Battery Storage System

Backup Gateway - COMING SOON

Why the SMILE-G3 stands apart

Monitor and optimise from anywhere