Aira Power Store battery and Power Hub: specifications and warranty

Aira's home battery is the Power Store, a unit that starts at 6.7 kWh and can be expanded up to 20 kWh over time¹. It pairs with the Power Hub, a hybrid inverter that Aira includes with every solar and battery installation and which manages the flow of electricity between the solar panels, the battery, the home and the grid³. Both units are built for outdoor installation and both are covered for 10 years under Aira's guarantee².

The chemistry is LFP, or lithium iron phosphate, which Aira says it chose for longer lifespan, strong safety performance and slower degradation over time³. The Power Store is rated to operate from -20°C to +55°C and is described as water- and dust-proof². Aira states the Power Store is compatible with island mode for power cuts, which is the mode that lets a battery keep supplying a home while the grid is down².

What the system does for independence is real but partial. It stores surplus solar generation instead of exporting it, so the household uses more of what its roof produces and buys less at peak times². It does not take the home off the grid, and the remote features depend on a broadband connection and Aira's own platform. The 10-year cover is a manufacturer's guarantee, and the longest terms sit inside a paid plan with conditions attached⁵.

What the Aira Power Store and Power Hub are

The Power Store is the battery. Aira describes its job as storing the energy a household does not use, ready for when it is needed most, such as in the evening when electricity prices peak¹. That is the standard self-consumption case for a home battery: excess power produced during the day is stored and used later when demand is higher⁸.

The Power Hub is the inverter, and it is the part that makes the system work as one. Aira describes it as acting as the central inverter for the system, converting electricity and balancing the energy flowing between the solar panels, the Power Store battery, the home and the grid³. It converts power between AC and DC so that every device and appliance gets the energy it needs¹. It also monitors demand in real time to smooth power spikes and stop blown fuses⁴.

The two units sit inside a wider package. Aira's home energy system combines the Aira Heat Pump, Power Store, Power Hub and solar panels⁹, and the company says the system is designed to expand, so solar panels and battery storage can be added after a heat pump rather than all at once⁷. Aira also installs solar panels and battery storage alongside a heat pump so a home produces, stores and uses energy more efficiently¹⁰.

For a household, the practical point is that the battery and the inverter are sold as a matched pair rather than as separate components from different makers. That simplifies the design and the warranty, and it also means the control layer, the app and the optimisation all come from one company.

Power Store capacity: 6.7 kWh starting, expandable to 20 kWh

The headline figure is 6.7 kWh. Aira states the Power Store starts at 6.7 kWh and can be expanded up to 20 kWh over time³, and the product page gives the available range as 6.7 kWh to 20 kWh². That is a modular design: a household can begin with the smallest unit and add capacity later rather than committing to the full 20 kWh at the outset.

Two things are worth separating. The first is nominal capacity, the figure quoted on the specification sheet. The second is usable capacity, which is what the battery can actually deliver after the depth of discharge and the inverter's own losses are accounted for. Aira's published figures are nominal, and the usable figure will be lower. The general principles are set out in battery capacity and usable capacity.

The expansion path matters for how a household sizes the system. Aira's own savings methodology assumes a 13.4 kWh Power Store alongside 18 x 470W solar panels and a 40L buffer tank⁹, which sits between the 6.7 kWh entry point and the 20 kWh ceiling. That is an illustration used in Aira's own modelling, not a recommendation for any particular home.

Sizing is not only about the battery. Aira's guidance on adding a battery to existing solar panels begins with a free home energy assessment to review the current solar system, electricity use and available installation space³. The assessment is free³, and it is the point at which the capacity question gets answered for a specific house. More on the trade-offs is at what size home battery do you need and modular and stackable battery systems.

LFP chemistry and why it matters for a home battery

Aira uses LFP battery technology in the Power Store³. LFP stands for lithium iron phosphate, one of the two main lithium chemistries sold for home storage alongside NMC. Aira's stated reasons for the choice are a longer lifespan, strong safety performance, slower degradation over time and stable performance in everyday home use³.

Those claims line up with the general case for the chemistry. LFP cells are less prone to the thermal runaway behaviour that makes NMC cells harder to contain, and they typically hold their capacity over more cycles. The trade-off is energy density: an LFP battery is physically larger and heavier for the same capacity, which is one reason home batteries of this type are usually wall-mounted outdoors or in a garage rather than tucked into a cupboard.

For a household, the chemistry choice shows up in two places. The first is expected life: a battery that degrades more slowly holds more of its original capacity for longer, which affects how many years of useful service the household gets. The second is safety and siting: a chemistry with stronger safety performance is easier to place in or against a home. The wider comparison is at home battery chemistries and how long does a home battery last.

Aira does not publish a cycle life figure or a retained capacity percentage for the Power Store on the pages reviewed here, so the degradation claim is qualitative rather than a number a household can check against a warranty threshold. That is a gap worth noting when comparing the unit with batteries that do publish those figures.

Power Hub: the hybrid inverter that manages solar, battery and grid

The Power Hub is a hybrid inverter, which means it handles the solar array and the battery through one unit rather than two separate devices. Aira describes it as an intelligent hybrid inverter managing solar panels and battery together³, and as the central inverter for the system³. Its functions are conversion, balancing the energy flowing between the solar panels, the battery, the home and the grid⁴, and converting power between AC and DC so appliances get what they need¹.

It also carries the optimisation. The Power Hub manages how energy flows between the solar panels, the battery, the heat pump and the grid, and enables optimisation by Aira Intelligence³. Aira Intelligence is described as the software that learns a home's routines, adapts to the weather forecast and syncs to a chosen tariff to optimise how energy is used, stored and even sold¹. Aira states it is the first clean energy tech installer to offer product optimisation against hundreds of energy tariffs⁹.

The Power Hub is included with every Aira solar and battery installation⁷, and every Aira solar installation includes it³. It is built for outdoor installation, water- and dust-proof, and designed to handle the elements⁴. It also monitors demand in real time to smooth power spikes and stop blown fuses⁴.

The dependence this creates is worth stating plainly. Tariff optimisation, remote monitoring and the app all run through Aira's platform and a home internet connection. The inverter itself keeps working without either, but the intelligence layer that makes the system earn its keep does not. That is the same pattern as any cloud-managed battery, and it is covered more broadly at monitoring a home battery and batteries and smart tariffs.

Outdoor installation: temperature range, weatherproofing and the Energy Storage Optimiser

Both units are specified for outdoor installation. Aira describes the Power Store as designed for outdoor installation², and the Power Hub as built for outdoor installation, water- and dust-proof, designed to handle the elements⁴. The Power Store is rated to operate from -20°C to +55°C², and Aira says it automatically adjusts to protect safety, performance and battery lifespan in extreme temperatures².

That temperature band is wide by domestic standards, and it is the reason the units can sit on an external wall through a British winter. General guidance for home batteries lists garages, external walls and utility rooms as possible locations depending on the model¹¹, so an outdoor position is one option among several in the wider market rather than a universal rule. Aira's own specification points to outdoors for these two units. The general considerations are at where a home battery can be installed and ventilation, temperature and operating conditions.

The Power Store comes with an Energy Storage Optimiser (ESO)². Aira does not publish a separate specification for the ESO on the pages reviewed here. In the wider regulatory picture, an energy smart appliance is defined as an appliance that can adjust the immediate or future flow of electricity, in or out of itself or another device, following a load control signal¹², and separately as an internet-connected appliance that can adjust its electricity usage automatically based on signals received remotely¹³. Energy storage systems exist to store heat or electricity so it can be used later¹⁴. The ESO sits in that category: a control component that decides when the battery charges and discharges.

Backup during power cuts: island mode

Aira states the Power Store is compatible with island mode for power cuts². Island mode is the operating state in which a battery disconnects from the grid and continues to supply the home's circuits while the network is down. It is the difference between a battery that saves money and a battery that also keeps the lights on.

Two conditions sit behind that compatibility. The first is the wiring: a battery can only run the circuits it is connected to through a changeover arrangement, so the household has to decide at the design stage which circuits are backed up. The second is the network connection rules. Ofgem's guidance on load control states that if storage is intended to be operated in island mode during a power outage, the fast track process is not applicable¹⁵. That means an island-mode installation goes through a different connection route from ordinary storage, which is a design and paperwork matter rather than a barrier. The general position is at battery backup in a power cut and telling the network operator about a home battery.

It is worth being clear about what backup is for. A domestic battery is not a standby generator. For comparison, the emergency battery backup units used in care settings provide only a few minutes of cover¹⁶. A home battery with island mode can run selected circuits for longer, but how long depends on the load and the state of charge, and Aira does not publish a backup duration figure for the Power Store.

The wider context is that outages do happen and can be planned. During an emergency, customers would lose power for around three hours per day on an area-by-area basis¹⁷. Network operators run support registers for households that would struggle during a cut, including those with poor mobility¹⁹, and the free power cut line is 105²⁰. A smart meter cannot cut off a home's power on its own²¹, and care and assisted living providers have their own arrangements with network operators²².

Warranty: 10 years on both units

Aira covers both units for 10 years. The Power Store page states everything is covered for 10 years, with parts, necessary repairs and servicing included². The Power Hub page states it is covered for 10 years⁴. Aira's guarantee page describes a 10-Year Product and Installation Warranty and a 10-Year Performance Guarantee for the Power Store⁵, and states that for Aira Power devices it means a 10-Year Product and Installation Warranty¹.

The structure is a two-tier guarantee. The heat pump sits under a 15-Year Product and Installation Warranty, and the Power devices under a 10-year term, with the first year free⁵. Aira's all-inclusive plan page also refers to a 15-Year Aira Guarantee⁷. The documents give different figures for the guarantee as a whole, and the split between the heat pump term and the Power device term is the way to read them: 15 years applies to the heat pump, 10 years to the Power Store and Power Hub.

The plan itself covers all the maintenance the heat pump needs, remote monitoring, premium app functionality, 4G connectivity if home Wi-Fi drops out, and 24/7 customer care, with the first year free¹⁰. Updated terms for the Aira All-Inclusive Plan took effect on 19 May 2026. For the wider market comparison, see home battery warranties.

What the system means for household energy independence

The Power Store and Power Hub move a household in one clear direction: more of the electricity generated on the roof is used on site rather than exported, and less is bought at peak prices. Aira states the system can cut energy costs by up to 80% by storing and selling excess energy when paired with an Aira Heat Pump and solar². That is the maker's own modelled figure for a specific system combination, not a guarantee for any individual home.

What the system does not do is take the home off the grid. The battery still charges from the grid when solar is short, the inverter still needs a grid connection to export, and the household still buys electricity from a supplier. The independence it delivers is partial: more self-consumption, some protection against peak pricing, and backup for selected circuits during an outage.

Three dependencies remain:

• The grid and a supplier, which the battery reduces but does not remove.
• The manufacturer's platform, since tariff optimisation, remote monitoring and app control run through Aira's software and a home internet connection.
• The guarantee itself, which is strongest inside the paid all-inclusive plan and weaker if the household opts out⁷.

Aira is listed as a Which? Trusted Trader²³ and the installation route runs through MCS certified installers²⁴, and Aira's own technicians are trained at the Aira Academy¹. The company also appears in Ofgem's approved innovation measures list for a 10-year parts and labour warranty on its air source heat pump²⁵.

For a household weighing the system, the honest summary is that the Power Store is a well-specified LFP battery with a wide operating range, a matched hybrid inverter and a 10-year product and installation warranty, sold as part of a wider heat pump, solar and battery package. The capacity can grow from 6.7 kWh to 20 kWh, the units are built for outdoor mounting, and island mode is supported for power cuts. The parts that depend on Aira, on broadband and on a continuing service relationship are the parts to weigh against that.