SolaX X1-MINI G4 1.5kW String Inverter (incl. WiFi and AFCI)

A practical size for smaller home solar systems

SolaX X1-MINI G4 1.5kW String Inverter with WiFi and AFCI is designed for domestic solar systems that sit beyond the very smallest end of the market but still do not need a larger or more complex inverter. It keeps the compact single-phase, one-MPPT design of the X1-MINI G4 family, making it especially appealing for tidy residential installs where space is limited and the array layout is simple.

This is the sort of inverter that works well when the property has a modest roof, but not such a small one that the 1.1kW model feels tight. It gives a more useful amount of output for everyday home solar while preserving the neat footprint, manageable weight and straightforward system logic that make smaller inverters attractive in the first place.

Why the 1.5kW version is often the better fit

The strength of the 1.5kW model is balance. It provides 1500W rated output and supports up to 3kWp of recommended PV array power, which is a meaningful step up for homes using modern, higher-output solar modules. That means the inverter can sit comfortably on modest domestic roofs without forcing the installer to jump into a physically larger unit simply to gain a little extra headroom.

Because the platform supports 200% DC oversizing, a 50V start-up voltage and a 40 to 450V MPPT range, it remains flexible with current panel classes. In practical terms, that helps installers design a small domestic system that feels current and commercially sensible rather than artificially constrained by the inverter choice.

Core features that matter on site

• 1500W rated single-phase output
• Up to 3kWp recommended PV input
• 200% DC oversizing support
• 40 to 450V MPPT range with 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 with optional meter or CT support
• IP66 enclosure and natural cooling

These figures make the 1.5kW version more than just a slightly larger variant. It gives enough headroom to suit a wider range of small home systems while still remaining easy to fit and easy to specify. The IP66 housing is helpful for external or semi-exposed mounting locations where appropriate, while the compact dimensions keep installation manageable in tighter domestic spaces.

Protection, communications and monitoring

One of the reasons this inverter stands out at the lower-output end of the market is that it does not drop the features that matter. It includes Type II surge protection on both AC and DC, and the wider product platform includes key safety functions such as anti-islanding protection, reverse-polarity protection, grid monitoring, residual current detection and temperature protection. That helps make it a credible residential choice rather than a compromised budget option.

Integrated WiFi improves the ownership experience too. Homeowners increasingly expect easy access to generation data, and installers benefit from faster setup and clearer post-install visibility. Export control support also gives extra real-world usefulness where site or DNO conditions make that relevant.

Installation and system fit

Like the smaller 1.1kW unit, this model stays compact at around 290 x 206 x 120 mm and around 5.2kg. That is a real benefit for domestic jobs, especially in garages, service cupboards, utility areas and smaller external wall spaces. Natural cooling avoids fan noise and helps keep the platform simple from a maintenance point of view.

Because it uses one MPPT and one string input, it is best matched to straightforward arrays on a single roof plane or similarly simple layout. Where that is the case, the simplicity becomes a strength. It keeps cost and complexity controlled while still giving the customer a well-specified modern inverter.

Who this inverter suits best

The 1.5kW X1-MINI G4 is best suited to small residential solar systems that need a little more flexibility than the entry model offers. It is a strong fit for compact family homes, bungalows, annexes, smaller retrofits and replacement installs where the project size does not justify jumping into a larger inverter category.

For homes with split roof aspects, more complex layouts or a stronger focus on battery integration, a different inverter type may be more appropriate. For clean, straightforward domestic PV design, though, this version hits a very useful middle ground.

Final view

SolaX X1-MINI G4 1.5kW String Inverter with WiFi and AFCI is a compact residential inverter that offers more array headroom than the 1.1kW model while staying small, tidy and easy to install. With support for up to 3kWp of PV, 200% oversizing, Type II SPD on AC and DC, integrated WiFi, export control capability and an IP66 housing, it is a very sensible choice for small home solar systems that need a bit more breathing room.