SolaX X1-MINI G4 2.5kW String Inverter (incl. WiFi and AFCI)

The most capable version in the compact X1-MINI G4 set

SolaX X1-MINI G4 2.5kW String Inverter with WiFi and AFCI is built for domestic solar systems that are still compact in overall form, but need more output capacity and more DC flexibility than the smaller 1.1kW and 1.5kW variants can provide. It keeps the same neat single-phase, one-MPPT architecture and compact mounting format, but it broadens what sort of residential array the X1-MINI G4 platform can support.

That makes it particularly attractive for homes where the roof area is limited but still capable of carrying a meaningful amount of solar. Instead of stepping immediately into a bigger inverter family, this version allows a more ambitious small residential system to stay within a compact and easy-to-handle format.

Why the 2.5kW model stands out

The clear advantage of this version is capacity. It supports up to 5kWp of recommended PV array power, retains 200% DC oversizing and extends the MPPT range to 40 to 550V. Those changes make it much easier to pair with modern, higher-output panels and to work with longer strings while still preserving the tidy footprint that many domestic installs need.

For a lot of homes, that combination is commercially very useful. It means the inverter can remain small and discreet without becoming a limiting factor as module power rises. The 2.5kW unit therefore sits in a strong position for larger small-home solar systems, clean retrofits and straightforward roofs where the customer wants more from the available space.

Key specifications and real-world benefits

• 2500W rated single-phase output
• Up to 5kWp recommended PV input
• 200% DC oversizing support
• 40 to 550V MPPT range and 50V start-up voltage
• One MPPT and one string input
• 16A maximum input current and 22A short-circuit current
• Integrated WiFi and AFCI in the listed specification
• Type II SPD on both AC and DC
• Built-in export control support
• IP66 enclosure and natural cooling

Those figures make a real difference to system design. The wider MPPT range gives more freedom on the DC side than the lower-output versions, while the strong oversizing allowance helps the inverter sit comfortably alongside current module sizes. The result is a product that remains compact but does not feel constrained.

Safety, monitoring and control

Like the rest of the X1-MINI G4 line, this model is built around a serious domestic safety package. The platform includes anti-islanding protection, reverse-polarity protection, grid monitoring, residual current detection, over-temperature protection and AC short-circuit protection, along with the built-in Type II surge protection on both AC and DC sides. For a residential inverter in this size class, that is a strong specification.

Integrated WiFi adds further value by making setup and ongoing monitoring easier. That helps both installers and homeowners, especially where generation visibility is important from day one. Export control support also improves its practicality for UK domestic design where that function may need to be considered from the outset.

Installation advantages

Even though this is the largest version in the set, it is still compact by inverter standards, at around 290 x 206 x 120 mm and roughly 5.5kg. That keeps wall mounting simple and helps the unit fit neatly into garages, utility spaces and sheltered external positions. Natural cooling is another benefit in domestic installs because it keeps the unit quieter and reduces moving parts.

Because it remains a one-MPPT inverter, it is still best used on simpler roof layouts rather than more segmented arrays that genuinely need multiple trackers. On clean, straightforward domestic roofs, though, that single-MPPT design helps keep the system simple while still allowing a stronger small-to-mid residential PV setup.

Who this inverter suits best

This version is best suited to homeowners and installers planning a larger small-to-mid domestic solar system on single-phase supply where the roof layout is uncomplicated but the available PV capacity is beyond what the smaller MINI models comfortably support. It also makes sense for retrofit upgrades where the original inverter is now undersized for modern module choices.

For properties with multiple roof aspects or more complex design demands, a multi-MPPT inverter may be a better route. For straightforward grid-tied domestic solar where compact size still matters, this 2.5kW version is the most versatile of the three MINI models listed here.

Final view

SolaX X1-MINI G4 2.5kW String Inverter with WiFi and AFCI is the strongest compact option in this X1-MINI G4 group for buyers who want more output and more PV design freedom without moving to a bulkier product family. With support for up to 5kWp of PV, a 40 to 550V MPPT range, 200% oversizing, Type II SPD on AC and DC, integrated WiFi and IP66 protection, it is a very well-rounded choice for stronger small-to-mid residential solar systems.