All-in-One Home Battery Systems: Battery, Inverter and Backup in One Unit

An all-in-one home battery system is a single enclosure that holds the battery cells, the inverter or power conversion system, the battery management system and, in most designs, the controls that decide when to charge and discharge. SolaX describes its all-in-one energy storage system as integrating all essential components, including batteries, an inverter and a control system, into a single compact unit¹. SAJ describes its HS2 series as integrating the PCS, BMS and battery into a modular, IP65-rated design, and its AS3 series as going further still, combining an EV DC charger, battery PCS, battery pack, backup system and energy management system in one unit². GivEnergy puts the point plainly: a battery and an inverter in one integrated product, removing the need to install the two separately⁴.

The practical consequence is that most of the system architecture is fixed at the moment of purchase. The inverter's power rating, the chemistry, the ingress rating that determines whether the unit can go outside, and the number of expansion modules the enclosure will accept are all decided by the model chosen rather than by mixing and matching later. GivEnergy's All In One 2 starts at 13.5kWh and accepts up to two expansion batteries, reaching up to 40.5kWh⁵. Sungrow's residential SBH range covers 10 to 40kWh per battery unit. A typical home system, in the Energy Saving Trust's description, might be 10 kWh.

For household energy independence, an integrated unit shifts when a home buys electricity and, with the right changeover hardware, keeps some or all of the house running in an outage. It does not remove the grid connection, the supplier relationship or the dependence on the manufacturer's firmware, cloud service and app. Domestic battery storage has a lifetime of around 10 to 15 years according to a POSTnote published for Parliament, shorter than the solar panels it often sits beside⁷.

What sits inside a single enclosure

The defining feature is integration rather than any particular capacity. SolaX's AEGIS is described as an all-in-one design including inverter, battery and BMS¹¹. Sunsynk's All in One ESS Elite combines a high-performance hybrid inverter, advanced battery technology and intelligent energy management into a single wall-mounted enclosure¹². Fox ESS lists a whole home backup gateway as part of its Evo All-in-One¹³. At the smaller end, Robinsun describes all-in-one battery systems that combine a battery, controller and micro inverter into a single device, connected to solar panels on one side and a power plug on the other, a pattern closer to plug-in battery storage than to a fixed installation¹⁴.

Two things follow. First, the unit performs both the functions that a split build would separate: DC storage and AC conversion. GivEnergy describes its hybrid inverter as a battery plus solar inverter in one unit¹⁵. Second, the enclosure has to be rated for where it will live. GivEnergy's All In One 2 expansion battery carries an IP65-rated enclosure for indoor or outdoor installation, and SAJ's HS2 and AS2 series are also IP65-rated⁹. Where a unit is not rated for outdoor use, siting is constrained from the outset, which bears on where a home battery can be installed.

The term is not unique to electricity storage. Panasonic uses "All-in-One" for a heat pump indoor unit that houses both the hot water tank and the hydraulic unit, and the Energy Saving Trust describes a monobloc air source heat pump as combining all components in one unit¹⁶. The logic is the same: fewer separate boxes, fewer interconnections, less installer decision-making on site.

All-in-one versus separate battery and inverter: which fits which home

A separate build pairs a battery of one maker's choosing with an inverter of another's, or with a different generation of the same maker's inverter. GivEnergy's system documentation shows how that works in practice: its AC coupled inverter pairs with any low-voltage battery, while its three-phase hybrid inverter pairs with any high-voltage stackable GivEnergy battery¹⁵. That flexibility is the main argument for splitting the two. It also means the installer must get the pairing, the cabling and the DC isolation right. GivEnergy notes its newest batteries come with an inbuilt DC isolator¹⁵.

The integrated route trades that flexibility for fewer variables. Sunsynk describes a unified warranty across the All in One ESS Elite, which removes the question of whether a fault sits on the battery side or the inverter side¹². Sunsynk's Elite range is sold as an all-in-one hybrid inverter and LiFePO4 battery system, floor-mounted and stackable with minimal wiring for faster installation¹⁸.

Which fits which home depends less on the technology than on what already exists. A property with solar panels and a working string inverter may be better served by an AC-coupled addition, a distinction set out in AC-coupled and DC-coupled home batteries. A property with no solar at all can still take a battery: Duracell Energy notes that with a standalone battery system, solar panels can be added later¹⁹. Birmingham City Council's group-buying scheme likewise allows battery storage to be added to existing solar panels²⁰. Third-party control software is broadly agnostic: Homey states it does not fundamentally matter which system is chosen, as long as there is a way to exchange data or a suitable integration.

Capacity and power: from 10kWh to 40kWh

Capacity across the integrated category clusters between 10 and 40kWh. Sungrow's SBH100 to SBH400 residential range is specified at 10 to 40kWh per battery unit²¹. GivEnergy's All In One 2 starts at 13.5kWh and reaches up to 40.5kWh with expansion batteries⁶. myenergi's libbi 10kWh system is built from two 5kWh battery modules²². Smaller GivEnergy batteries in the wider range include a 5.12kWh unit, and high-voltage stackable options at 10.2kWh, 13.6kWh, 17.0kWh and 20.4kWh¹⁵.

Independent sources put typical household need lower than the top of that band. The Energy Saving Trust states that a typical home system might be 10 kWh⁸. Solar Energy UK, writing in April 2026, describes residential battery energy storage systems as typically in excess of 10kWh, which it frames as well over five average washing machine cycles²³. GivEnergy's own stackable high-voltage range runs from 10.2 kWh to 20.4 kWh, so whole-house cover through a winter evening usually means stacking modules rather than fitting a single unit²⁴.

Nameplate capacity is not usable capacity. Systems hold a reserve: the Energy Saving Trust describes a set floor of perhaps 20% of total storage capacity at which discharge stops, and states the system should never let the battery discharge to zero, as that can significantly reduce battery life⁸. The difference between the two figures is set out in battery capacity and usable capacity, and sizing against actual household consumption in what size home battery do you need.

Single-phase or three-phase: matching the system to your supply

Most British homes are single-phase, and most residential all-in-one units are built for single-phase supplies. Northern Ireland Electricity Networks states that above 17kW on a single-phase supply, a three-phase supply is required¹⁰. That threshold sits well above what a domestic battery inverter draws or exports, so the phase question is usually settled by what the property already has rather than by the battery itself.

Identifying a three-phase supply is a visual matter. OpenEnergyMonitor describes the tell: eight reasonably thick cables at the meter, four of which go to the consumer unit or fuse board, together with a three-pole or four-pole linked circuit breaker²⁵. Larger and older properties, converted buildings and homes with heavy electric loads are the likelier candidates.

Where a property is three-phase, the hardware differs. GivEnergy lists a three-phase hybrid inverter, described as a battery plus solar inverter in one unit, which pairs with any high-voltage stackable GivEnergy battery and uses plug-to-plug cabling¹⁵. That is a split architecture rather than a single-enclosure product, which illustrates a general point: the integrated single-box category is thinner at three-phase than at single-phase, and a three-phase home may find the choice narrows to separate components.

Either way, the network operator has to be told. The process for that is covered in G98 and G99 notification, and the installation standards that apply in PAS 63100, BS 7671 and MIS 3012.

LiFePO4 chemistry and what it means for safety

Lithium iron phosphate is the dominant chemistry in this category. GivEnergy states that at the heart of every GivEnergy battery is Lithium Iron Phosphate (LiFePO4) chemistry, and lists the All In One 2 and its expansion battery as LiFePO4²⁶. Sunsynk's Elite units are described as all-in-one hybrid inverter and LiFePO4 battery systems¹⁸. ZEDpods, a BRE Science Park development, uses a LIPO4 battery store²⁷.

The claimed advantages come from the makers and should be read as such. GivEnergy states:

GivEnergy further describes the All In One 2 expansion battery as non-flammable and 99% recyclable, and states 100% recyclability for its batteries more broadly⁹. Those two recyclability figures differ between documents.

Chemistry alone does not make an installation safe. The battery management system governs cell balancing, temperature and cut-outs, which is why an integrated unit's BMS is listed alongside the inverter as a core component¹¹. Siting, ventilation and operating temperature all bear on real-world risk, and the wider picture is set out in home battery fire safety, what is thermal runaway and the comparison of chemistries in home battery chemistries.

Backup power depends on a changeover device, not the battery

This is the point most often misunderstood. A battery on its own does not keep the lights on in a power cut. GivEnergy states that the All In One 2 delivers seamless switchover for backup power during blackouts when paired with a Gateway 2, and that the Gateway 2 enables full whole-home backup and advanced load control when paired with the All-in-One 2 system⁶. The gateway is a separate purchase and a separate piece of wiring. AlphaESS describes its systems as serving as an emergency power supply thanks to a built-in UPS function, and says that in some cases it is possible to power an entire house from surplus solar energy previously stored in the battery²⁹. Fox ESS lists a whole home backup gateway with its Evo All-in-One¹³.

Which? is blunt about the gap between expectation and product:

Which? advises asking the installer whether a given battery will work in a power outage and for how long³⁰. Both questions matter: a unit that backs up only a handful of essential circuits behaves very differently from one wired for whole-home backup, and duration is a function of usable capacity against the loads left running.

The Climate Change Committee, looking at household resilience, notes that further innovation in home battery technology, vehicle-to-everything and solar can provide households with additional backup options during power outages³¹. That is a direction of travel, not a present guarantee. For the wiring and the terminology, see battery backup in a power cut and do I need a backup interface.

Smart tariffs and automated charging

An integrated unit earns most of its return by buying electricity cheaply and using it when electricity is dear. GivEnergy describes the pattern directly: charge when energy is free or cheap, discharge when energy is expensive, with the system automatically charging and discharging based on the times that will save money³². It also states the All In One 2 maximises solar energy and can charge from the grid⁵. Growatt lists AI dynamic tariff optimisation and smart self-consumption on its VETA 2200 plug-in all-in-one battery³³.

The tariff is not optional if the saving is the point. The Energy Saving Trust states that to benefit properly from smart appliances, electric vehicles and home batteries, a smart tariff is needed, and that an EV, heat pump or home battery makes smart tariffs much more valuable³⁴.

Compatibility is the catch. Which? asks whether the tariff is compatible with the battery, noting that some only work with specific systems³⁶. GivEnergy states its batteries work seamlessly with any smart tariff³²; Duracell Energy states its systems integrate with all dynamic tariffs¹⁹. Those are manufacturer claims about their own products, and a household considering a particular tariff would check the pairing before committing. The same pattern is visible in EV charging, where Which?-style product comparison found the Ohme Home Pro to be one of the only chargers able to integrate with both Octopus and OVO smart tariffs, and the Wallbox Pulsar Max compatible with Octopus Intelligent but not with OVO's equivalent³⁷. Smart tariff control typically runs through an app, which is a dependence on the maker's cloud service as much as on the supplier. The economics are set out in stacking a home battery with smart tariffs.

Cost: what the published figures show

There is no single price for an all-in-one system, and installers quote per property. The published independent figures give a frame. The Energy Saving Trust puts home battery storage at £1,500 to £10,000, with a 5kWh battery system around £4,600⁸. A ClimateXchange study for Scotland modelled a single 8kWh battery system at £4,350 across all house types³⁸. For a combined installation, Hive published a price of £8,485 for a full system and install through Effective Home in May 2026, based on a ten-panel system with 400W premium panels and a 5.32kWh solar battery³⁹. At the upper end, Jackery estimates £12,000 and above for a whole-house backup plus EV charging system, with a payback period of 10 years or more²⁴.

Whether that pays back is contested. The Centre for Sustainable Energy is direct: domestic battery systems may save on imported electricity costs, but they are currently very expensive and do not make financial sense for every household⁴¹. NICEIC cites Octopus Energy calculations that a medium-use household with a ten-panel system and a 5kWh battery will save between £822 and £1,069 per year depending on tariff⁴².

Public support changes the arithmetic in some cases. The UK Government's Warm Homes Plan, announced in January 2026, covers the full average cost of solar panels and battery installations for low-income households, which it puts at £9,000 to £12,000⁴⁰. Figures are stated as published and VAT treatment varies by scheme and installation; the VAT rate on home battery storage covers that separately, alongside home battery cost and payback and savings.

Warranty and expected lifespan

Warranty terms on integrated units are long by the standards of household electrical goods. GivEnergy lists 15 years on both the All In One 2 and its expansion battery, and 12 years across its product warranties more broadly⁵. Fox ESS lists a 12 year warranty on the Evo All-in-One¹³. Sunsynk offers a unified warranty across the All in One ESS Elite, meaning one claim route rather than two¹².

Expected life is a separate question, and the independent figures run shorter than the warranty terms:

• POSTnote for Parliament: domestic battery storage has a lifetime of around 10 to 15 years, shorter than solar panels⁷
• Energy Saving Trust: typical lifespan about 10 to 12 years⁸
• Centre for Sustainable Energy: typical battery lifespan 8 to 12 years⁴³

Those three sources disagree at the edges, and the spread across them is 8 to 15 years. GivEnergy states its high voltage batteries offer 100% depth of discharge over a 10-year lifespan²⁶.

For an integrated unit the warranty question carries extra weight, because the inverter and the battery fail on different timescales in a split system and can be replaced separately. In a single enclosure, a converter fault and a cell fault both route to the same manufacturer, which is convenient while that company is solvent and a single point of failure if it is not. Degradation behaviour over a decade is covered in cycle life and degradation.

Expanding capacity later, and where the limit sits

Expansion in an all-in-one unit is bounded by the enclosure. GivEnergy states that up to two expansion batteries can be added per All In One 2 system, with a 13.5kWh expansion battery designed to increase the storage capacity of the All-in-One 2⁹. Starting at 13.5kWh and adding two expansions gives the stated 40.5kWh ceiling⁶. Once that limit is reached, more capacity means a second system, not a third module.

This is the structural difference from a stackable battery paired with a separately sized inverter, where the stack can grow within the inverter's rating. Modular and stackable battery systems and can I add more batteries later cover that route. Adding solar afterwards is generally straightforward: Duracell Energy states that solar panels can be added later to a standalone battery system¹⁹, and Birmingham City Council's scheme allows battery storage to be registered against existing panels²⁰.

Availability in the UK and models that have been withdrawn

Products in this category come and go, and a model researched online may no longer be sold. Which? lists the Samsung SDI All-in-one as available in the UK and the Enphase AC Battery as available via UK installers³⁰. On 17 September 2026, the Livoltek iPower AC Coupled all-in-one was marked as discontinued on a UK trade listing, and the GivEnergy Wi-Fi Dongle was likewise listed as discontinued.

Software support is its own dependency. Wondrwall states that full app reporting is currently available for its V.1 battery systems, with V.2 All-in-One compatibility expected in Q4 2026⁴⁵, which is a reminder that the intelligence in an integrated unit is delivered over time and can lag the hardware. Corporate ownership shifts too: on 11 August 2026, Iemcs Limited was notified as a person with significant control of a GivEnergy-related company and Givenergy Group Limited ceased to be a person with significant control.

Manufacturers also use the same product names across market segments. The GivEnergy Commercial All-in-One is a fully integrated commercial energy storage system combining PCS, battery, controls and safety equipment in a single cabinet⁶, which is not a domestic product despite sharing the label.

What it does for independence, and what it does not

GivEnergy describes the purpose of its batteries as storing renewable energy and reducing reliance on the grid⁴⁴. That is accurate as far as it goes. A 10kWh to 40kWh integrated unit lets a household buy electricity at one time and use it at another, self-consume more of its own generation, and, with a gateway, ride through outages.

The dependencies that remain are worth stating as firmly. The grid connection stays, because the unit charges from it when solar is short. The supplier relationship stays, and deepens, because the saving depends on a time-of-use tariff and that tariff's continued availability³⁴. The manufacturer's cloud service and app carry the scheduling. The chemistry, the inverter rating and the expansion ceiling are all fixed by the model chosen. And the hardware itself has a working life of 8 to 15 years across the independent estimates⁷, after which it is a replacement purchase, not a permanent asset. How far the picture can be pushed towards autonomy is set out in home batteries and household energy independence and, for the whole subject, the guide to home battery storage.