SolaX in the UK: X1-Hybrid G4, T-BAT batteries and warranty

SolaX is worth comparing if you want panels, a battery and some backup circuits planned as one system from the start, and your installer is certified by SolaX. Its range spans several generations, so "SolaX 5 kW with battery" on a quote doesn't tell you the usable capacity, the backup power or the warranty. SolaX's UK warranty gives the X1-Hybrid G4 inverter 5 years, rising to 10 at no charge if it is connected to SolaX Cloud and its generation data is uploaded to SolaX's servers. Get the full model codes and a wiring plan in writing.

SolaX at a glance

Which SolaX is on your quote?

SolaX's UK product list includes these home inverters:

On the ENA register, the X1-Hybrid LV's older records (September 2024) are listed as compliant, but ten newer records published on 17–18 September 2026 show 'Non-compliant' with no reason given. If your quote includes an X1-Hybrid LV, ask the installer which register record its type-test certificate refers to, and check that record before you sign.

We use the X1-Hybrid G4 and T-BAT H 3.0 V2 as the example, because SolaX pairs them with its Matebox as the X-ESS G4 system. That doesn't mean every SolaX battery suits every X1, so ask the installer to confirm the exact combination and firmware.

Three separate decisions

The hybrid inverter converts power from the panels and runs the battery; the battery stores kWh for later; backup equipment separates your home from the grid in a power cut and powers the circuits you choose. Buying the first two doesn't install the third.

Figures from SolaX's X1-Hybrid G4 datasheet (V3.0) for three common sizes:

All sizes have two MPPTs, take a lithium or lead-acid battery between 80 and 480 V, and switch to backup in under 10 milliseconds. The kW rating says nothing about battery capacity or your roof, so ask for a string plan and the predicted yield; an east–west roof needs a different design from a single south face.

G98 or G99

In Great Britain, the grid rule depends on inverter output, not panel size. Up to 16 A per phase (3.68 kW on a single-phase supply), the system goes in under G98 and the network operator hears about it within 28 days of commissioning. Over that limit, G99 means the installer applies first and waits for the operator's approval.

The X1-Hybrid 3.7 is rated at 3,680 W and 16.0 A, so it fits under G98 on its own. At 5.0, 6.0 or 7.5 kW, even with a small array, a G99 application comes first. Any other inverter at the same address counts towards the same total. The ENA type-test register lists X1-Hybrid 3.0 to 7.5 kW models as compliant (the most recent compliant records for all five sizes were published on 10 October 2025). Northern Ireland has its own versions, G98/NI and G99/NI, with NIE Networks expecting the paperwork within 30 days.

Compare the kWh you can actually use

Compare batteries on usable kWh, not on the model name. SolaX's T-BAT H 3.0 V2 datasheet separates total energy from usable energy:

The usable figures are measured at 25°C at 90% depth of discharge. A backup reserve and conversion losses reduce what reaches your sockets; the datasheet gives a round-trip efficiency of 95%.

Power matters as much as capacity. A one-module stack is rated at 2.5 kW, so paired with a 5 kW inverter it can't run your home at 5 kW from the battery; ask for the whole system's figure, in normal use and in backup.

The UK warranty also caps the battery by throughput: each 3.1 kWh module is covered until it falls below 70% of its rated energy or has delivered 9.6 MWh, whichever comes first. That is about 3,400 full cycles of the 2.8 kWh you can use (9,600 ÷ 2.8), so a module fully cycled every day, for example charged overnight on a cheap tariff, would reach the limit after about nine and a half years, just before the 10-year term ends. Our solar battery guide explains how to size a battery to your evening use.

Backup needs a wiring plan

A grid-connected system shuts down in a power cut to protect people working on the network. SolaX's X-ESS G4 combines the X1-Hybrid G4, a T-BAT battery and the Matebox to supply chosen circuits when the grid fails; treat it as a design, not a feature every quote includes.

List the loads you want to keep, such as the router, lights, fridge and boiler controls. A pump or freezer draws more when it starts than when it runs, so the installer should check that peak against the backup output. A bigger battery lasts longer but doesn't turn a small backup output into power for the whole house. Ask what reserve is kept for backup (a higher reserve leaves less for everyday use) and for a live test at handover.

The UK warranty and its conditions

SolaX's UK and Ireland warranty terms (version 1.7) cover products installed from 1 July 2026. The main points:

• Inverter: 5 years for the X1-Hybrid G4, from installation or nine months after manufacture, whichever is earlier. It rises to 10 years at no charge if the inverter is connected to SolaX Cloud and its generation data uploads to SolaX's servers, so keep it online.
• Batteries: 10 or 12 years depending on the model (see the table above), each with the throughput cap described earlier.
• Registration: register within 90 days of commissioning. Unregistered products keep only the standard term, counted from nine months after manufacture.
• Who can install it: the warranty applies only to products bought through an authorised seller and installed by an installer certified by SolaX or its distributors.
• Claims: go through your installer or distributor first; report a fault within four weeks. SolaX covers the part and its delivery in the UK and Ireland, but not travel or on-site labour.
• Moving the unit ends the cover unless it is refitted at the same address by a qualified installer who sends SolaX a test report.

SolaX's terms choose Chinese law and arbitration in Shanghai. As a UK consumer you keep your statutory rights, but the simplest route is usually the business that sold you the system: under the Consumer Rights Act 2015 it must put right goods that turn out not to be of satisfactory quality, or that were installed incorrectly, whatever SolaX decides. Ask that business to register the products in your name, and keep your SolaX Cloud login and the commissioning report.

Comparing two SolaX quotes

Ask for prices with and without a T-BAT, on the same panels and yield estimate, and check each quote for:

1. the full inverter code and size, and whether it needs G98 notification or a G99 application;
2. the battery model, number of modules, usable kWh and rated power;
3. the Matebox or other backup equipment, the circuits it covers and a test at handover;
4. the meter or CT, so SolaX Cloud shows household use as well as generation;
5. proof that the installer is certified by SolaX, and who registers the warranty;
6. the MCS certificate (or equivalent certification): in Great Britain, electricity suppliers pay for exports through their own Smart Export Guarantee tariffs, and they ask for it first.

A SolaX system that your installer supplies and fits, battery included, carries no VAT until 31 March 2027; after that the rate is 5% unless the relief is extended. MCS's product directory doesn't list inverters or batteries, so look up the installer's own MCS certificate, and check RECC or HIES membership separately before paying a deposit. Before you pay, weigh the two SolaX prices with our quote comparison guide, and use our installer checklist to confirm the SolaX certification and warranty registration. Our calculator estimates a system size for your roof; for alternatives, see Solis, Fox ESS and Growatt.

Frequently asked questions

How long is the SolaX warranty in the UK?

For the X1-Hybrid G4, 5 years, or 10 if the inverter is connected to SolaX Cloud and its generation data is uploaded. T-BAT H 3.0 batteries have 10 years and the newer HS modules 12, each with a throughput limit.

Does a T-BAT H 6.0 V2 give you 6 kWh?

No. Its datasheet gives 6.1 kWh in total and 5.5 kWh usable under test conditions. What reaches your sockets also depends on conversion losses and the reserve you keep.

Does a 5 kW SolaX inverter need DNO approval?

In Great Britain, on a single-phase supply, yes: 5 kW is over the 3.68 kW G98 limit, so the network operator must approve a G99 application before the switch-on. The 3.7 kW version stays within G98, where notice after installation is enough.