SolaX Triple Power batteries: HS36 and T-BAT specifications

SolaX builds two families of home battery under the Triple Power name. The high-voltage T-BAT stack uses 5.8 kWh modules and reaches 34.6 kWh in a single tower, or 69.1 kWh where the inverter has two battery ports¹. Across the range SolaX quotes capacities from 2.5 kWh to 92.1 kWh, all on LFP chemistry with a smart battery management system¹.

The headline numbers a householder will want are these: 95% depth of discharge, so a 5.8 kWh module gives 5.5 kWh of usable energy; a round-trip efficiency of 95%; a cycle life above 6,000; and a 10-year warranty on the T-BAT H 5.8 V3³. Prices come from distributors rather than the manufacturer, and one 14.4 kWh HS36 bundle is listed at £3,141.18 ex VAT⁶.

What follows is what the published specifications say, where the figures differ between documents, and what the system leaves a household dependent on.

Triple Power at a glance: 2.5 to 92.1 kWh of LFP storage

SolaX presents the Triple Power range as modular storage built on LFP chemistry with smart BMS control, and quotes capacities across the range from 2.5 kWh to 92.1 kWh¹. That span covers a single small module at one end and a multi-tower commercial-scale installation at the other, so the range figure is a description of the product family rather than of any one system a household would buy.

The chemistry matters more than the headline. LFP, lithium iron phosphate, is the cell type SolaX uses throughout the Triple Power line, and the company describes LiFePO4 batteries as offering 6,000 or more cycles and as standard in its products⁸. LFP is the more thermally stable of the common lithium chemistries, which is why it dominates the stationary storage market. A separate page on home battery chemistries sets out how it compares with NMC.

The modular idea is the point of the range. Rather than one sealed unit, the T-BAT systems stack identical modules on a tower, and capacity grows by adding modules. SolaX describes the T-BAT H 3.0 V2 as ranging from 3.1 kWh up to 12.3 kWh, and the T-BAT H 5.8 V3 at 5.8 to 34.6 kWh³.

For a household, the practical consequence is that the battery can be sized to the house rather than the other way round, and expanded later without replacing what is already installed. The trade-off is that a stack takes floor or wall space and each added module adds cost. More on the general principle is at modular and stackable battery systems.

T-BAT H 5.8 V3 specifications: 5.8 kWh modules, 95% depth of discharge, IP66

The T-BAT H 5.8 V3 is the current high-voltage module, and its datasheet gives the fullest picture of how the stack behaves at each size². Nominal capacity runs 5.8 kWh for one unit, 11.5 kWh for two, 17.3 kWh for three, 23.0 kWh for four, 28.8 kWh for five and 34.6 kWh for six. Usable energy at 95% depth of discharge is 5.5 kWh, 10.9 kWh, 16.4 kWh, 21.9 kWh, 27.4 kWh and 32.9 kWh respectively, so the nominal figure is not all available to the household².

Power scales with the stack too. Rated charge and discharge power is 2.9 kW at one module, 5.8 kW at two, 8.6 kW at three, 11.5 kW at four, 14.4 kW at five and 17.3 kW at six. Maximum charge and discharge power is higher again: 4 kW, 8.1 kW, 12.1 kW, 16.1 kW, 20.2 kW and 24.2 kW². Nominal voltage climbs from 115.2V at one module to 691.2V at six, with the operating voltage range at the smallest size given as 100 to 130V².

The datasheet lists the environment as outdoor or indoor, cooling as natural, and protection class as Class I². SolaX describes the 5.8 V3 as using LFP chemistry². The 3.0 V2 module in the same family carries IP65 protection¹. Depth of discharge is the share of nominal capacity the system will actually release, and the difference between nominal and usable kWh is explained at battery capacity and usable capacity.

Efficiency and cycle life: 95% round trip and over 6,000 cycles

SolaX quotes a 95% battery round-trip efficiency for the T-BAT H 3.0 V2 and a cycle life above 6,000 cycles³. The same 95% round-trip figure appears for the T-BAT-SYS-HV-5.0⁹, and cycle life above 6,000 cycles is repeated across the range: the T-BAT H 3.0 V2, the T-BAT-SYS-S3.6, the T-BAT-SYS-S2.5 and the T-BAT-SYS-LV D150 all carry it¹. SolaX states that LiFePO4 batteries offer 6,000 or more cycles and are standard in its products⁸.

Round-trip efficiency is the share of the electricity put into the battery that comes back out. That figure sits at the better end of what domestic batteries achieve, and the general picture is set out at round-trip efficiency.

Cycle life needs reading with care. A cycle is a full charge and discharge, and a battery rated above 6,000 cycles is being described under specific test conditions, usually a defined depth of discharge and temperature. Real use involves partial cycles, which is gentler, and hot or cold conditions, which are not. The warranty terms are the more useful guide to what the maker will stand behind, and those are covered below. The wider question of how long a battery lasts is at cycle life and degradation.

For a household, the efficiency figure is what determines how much of a cheap overnight tariff actually lands in the battery, and the cycle figure is what determines how many years of that arbitrage the system can deliver. Neither is a promise about a particular installation.

Scalability: from a single 3.1 kWh module to 69.1 kWh dual-port stacks

The T-BAT H 5.8 V3 datasheet gives a maximum of 6 units and 34.6 kWh for a single cluster². One regional datasheet for the same product states scalability of 1 to 5 modules, so the two figures for a single tower do not agree¹². Where the inverter has two battery ports, SolaX quotes a maximum of 12 units and 69.1 kWh¹³.

The wider family offers other routes. The T-BAT H 3.0 V2 supports a BMS-Parallel Box-II G2 for up to two battery towers³. The T-BAT-SYS-LV D150 supports up to 16 parallel units and a peak discharge current of 310 A for 10 seconds³. The T-BAT-SYS-HV-5.0 scales to 10 to 20 kWh⁹, and the T-BAT-SYS-HV-S3.6 offers a range from 7.3 kWh up to 47.9 kWh using stackable plug-and-play modules¹⁴.

Those are complete systems rather than single modules, which is why the capacities step in larger increments than the 5.8 kWh module size.

For a household, scalability is the difference between buying the right size now and buying the right size eventually. Adding a module later is cheaper than replacing a whole system, but it depends on the same product still being sold and on the inverter accepting the extra capacity. The general case is at adding more batteries later.

Compatibility with SolaX inverters and the X-ESS G4 all-in-one system

The Triple Power batteries are designed to work with SolaX hybrid inverters. The T-BAT H 3.0 V2 integrates with the X1-Hybrid G4 and Matebox to create the X-ESS G4 all-in-one system¹, and the T-BAT-SYS-HV-3.0 does the same¹⁵. The X1-HYBRID G4 datasheet lists compatibility with both lithium and lead-acid batteries¹⁶.

The X-ESS G4 is SolaX's packaged system: an all-in-one, plug-and-play design using LiFePO4 batteries, described as IP65 and fireproof tested, with support for three-phase unbalance output⁸. It is AC coupled, which means it can be added to a home that already has solar without replacing the existing inverter¹⁷. SolaX also lists the X-ESS G4 as compatible with an EV charger and a heat pump⁸, and its smart EV charger is designed to integrate with the X-ESS G4 solar and storage system¹⁹.

SolaX describes its residential all-in-one platform as able to integrate with generators, heat pumps and EV chargers¹⁸. The X3-HYBRID G4 supports both on-grid and off-grid applications and is aimed at homes with solar, batteries and EV chargers²⁰. The X3-HYB-G4 PRO has dual battery ports for added design flexibility²¹.

The communications link between battery and inverter is a wired one. The T-BAT-SYS-HV-S2.5 datasheet lists CAN2.0 and RS485²². Those protocols are what let the inverter read the battery's state of charge and control when it charges and discharges, which is the basis of any tariff-based charging routine.

For a household, compatibility is the constraint that decides whether a battery can be added to an existing system or whether the inverter has to change too. A DC-coupled battery needs a matching hybrid inverter; an AC-coupled system such as the X-ESS G4 does not. The distinction is set out at AC-coupled and DC-coupled battery systems, and the packaged approach at all-in-one battery systems.

Warranty: 10 years on the T-BAT H 5.8 V3

The T-BAT H 5.8 V3 datasheet gives a warranty of 10 years². SolaX's warranty pages set out the terms by product series, and the structure is not uniform. One list gives 10 years standard warranty for a group of battery series including the T-BAT-SYS-HV-3.0 and T-BAT-SYS-HV-5.8, 12 years for another group including the T-BAT-SYS-HV-S2.5 and T-BAT-SYS-HV-S3.6, and 5 years for a third group including the T-BAT-SYS-HV-S50E and T-BAT-SYS-LV-D150¹³. A separate page gives 5 years for the T-BAT-SYS-HV-S2.5 and T-BAT-SYS-HV-S3.6, so the two published terms for those two models do not agree¹².

The start date is defined rather than assumed. SolaX states that the standard warranty runs from the earlier of first installation or six months after production¹². The performance warranty runs for 120 months after the commissioning date²³. Registration is required within 90 days of commissioning, through the SolaX online portal²³.

The performance warranty is expressed as energy throughput rather than years alone. For the T-BAT LD53, a 5.3 kWh unit, SolaX quotes 16.2 MWh; for the T-BAT LR25, a 2.5 kWh unit, 7.8 MWh²³. That is the total energy the battery is warranted to pass through, and it is the figure that matters if the battery is cycled hard every day.

Where registration fails for a device that is not from a stolen batch, SolaX asks owners to contact its service team at service.eu@solaxpower.com¹³. Independent guidance lists a 10-year warranty for SolaX battery systems²⁴. The general structure of home battery warranties, including retained capacity and throughput conditions, is at home battery warranties.

Cost and UK availability: HS36 bundles from £1,764.71 ex VAT

SolaX does not publish list prices for its batteries. The figures that exist come from UK distributors, and they are quoted ex VAT. The HS36 master box is listed separately at £435.29 ex VAT⁶.

These are distributor prices for the equipment, not installed prices, and VAT treatment is not stated in the listings. Installation cost depends on the inverter, the siting, the electrical work and whether a backup circuit is being added, so a fitted price is installer-quoted. The wider cost picture is at home battery cost.

Availability is a live issue for parts of the range. The SolaX Triple Power HV 5.8 kWh LFP Main Battery MASTER V2 was discontinued on 1 September 2026, with the reason given as phased out²⁵. The matching extension battery, the SLAVE V2, was listed as awaiting stock arrival and due around 23 September 2026²⁶. A household buying into the V2 generation should check what remains available before committing to that stack.

Where the range has limits

The dependence a SolaX battery creates is mostly on the manufacturer and its software. The T-BAT H 3.0 V2 supports remote diagnostics, upgrades and low-temperature battery heating³, and the T-BAT-SYS-LV D150 lists remote fault diagnosis, upgrade and maintenance²⁷. Those features are useful, but they run through SolaX's systems rather than the household's own.

The warranty structure adds a second dependence. The term varies by product series, the start date is defined by installation or production rather than by purchase, and registration within 90 days is a condition¹². A household that changes installer, loses paperwork or misses the registration window is exposed.

The discontinued MASTER V2 is the clearest limit. A product phased out in September 2026 will not be expandable indefinitely, and matching extension units depend on remaining stock²⁵. Anyone buying a stack should establish which generation it belongs to and how long that generation will be supported.

On independence, the position is straightforward. A Triple Power battery stores electricity the household has generated or bought cheaply, and releases it when needed, which reduces the amount drawn from the grid at peak times. It does not remove the grid connection, the electricity supplier or the need for an inverter, and the remote features depend on the manufacturer's platform. The wider picture is at home batteries and household energy independence, and the SolaX range as a whole at SolaX home batteries.