SolaX X1-MINI G4 1.1kW String Inverter (incl. WiFi and AFCI)

A compact inverter for genuinely smaller solar systems

SolaX X1-MINI G4 1.1kW String Inverter with WiFi and AFCI is a single-phase on-grid inverter built for domestic solar systems where the array is modest, the property demand is lower, or export limitations make a smaller AC output the sensible choice. Rather than pushing a small installation into an oversized inverter, this model gives installers and homeowners a cleaner fit for compact solar designs while still retaining the safety, control and monitoring features expected from a current-generation SolaX platform.

That is what makes this unit useful. Smaller arrays still need a proper inverter with credible protection and practical DC headroom. The 1.1kW X1-MINI G4 delivers 1100W rated output in a compact body, making it well suited to garages, annexes, lower-consumption homes, small roof areas and replacement jobs where the original inverter size was modest and there is no reason to overspec the new one.

Why this version makes sense on smaller domestic jobs

The 1.1kW model is the right choice when the project brief is clear and restrained. Some properties simply do not need a larger inverter, and using one can add cost without adding meaningful value. This version supports up to 2.2kWp of recommended PV array power and 200% DC oversizing, so it still has useful flexibility with modern modules even though the AC output remains deliberately compact.

That matters because panel wattages have increased considerably. A small roof can now carry a meaningful number of watts, so an inverter at this end of the market still needs sensible input capability. With a 50V start-up voltage and a 40 to 450V MPPT operating range, this unit is designed to wake up early, work across changing conditions and pair sensibly with modern panel formats without forcing the customer into a larger inverter family.

Key technical strengths

• 1100W rated single-phase AC output
• Up to 2.2kWp recommended PV input with 200% oversizing support
• 40 to 450V MPPT range with 50V start-up voltage
• One MPPT and one string input for simple array layouts
• 16A maximum input current and 22A maximum short-circuit current
• Type II surge protection on both AC and DC
• Integrated WiFi and AFCI in the listed specification
• Built-in export control with optional meter or CT support
• IP66 enclosure and natural cooling

Those numbers are not just datasheet filler. They translate into a compact inverter that can still handle modern residential design expectations. The current allowance is useful with today’s modules, while the voltage window keeps design practical for straightforward strings. The combination of integrated protection and export-control functionality also means this is not a stripped-back entry product.

Protection, control and day-to-day usability

SolaX specifies a strong safety package across the X1-MINI G4 range, and that is part of the appeal here. The product platform includes anti-islanding protection, reverse-polarity protection, grid monitoring, over-temperature protection, residual current detection and AC short-circuit protection, alongside the built-in Type II SPD on both AC and DC sides. For domestic systems, that is the level of specification buyers and installers increasingly expect.

WiFi support also helps keep commissioning and monitoring straightforward. That matters because homeowners want visibility over generation, and installers want a product that is easy to set up and easy to support afterwards. Export control support adds further real-world value on sites where that needs to be managed as part of the system design.

Installation benefits

At around 290 x 206 x 120 mm and 5.2kg, this inverter is very easy to handle compared with larger units. That makes it especially suitable for service areas, cupboards, utility walls and tighter external mounting positions where a bigger chassis would be awkward. Natural cooling is also useful in residential environments because it avoids added fan noise and keeps the platform simple.

Because this is a one-MPPT, one-string inverter, it is best used on clean, uncomplicated roof layouts. On the right job, that simplicity is a strength rather than a limitation. It keeps system design tidy and cost-effective while still giving the user a current inverter platform with strong core functionality.

Who this inverter suits best

This model is best suited to smaller domestic PV systems on single-phase supply, especially where the objective is proportionate sizing rather than simply choosing the largest inverter available. It is also a sensible option for replacement installs, smaller outbuildings, low-consumption homes and properties where available roof area does not justify extra AC capacity.

If the system design is more complex, has multiple roof orientations or is being built around battery-first thinking, a different type of inverter may be better suited. For a simple grid-tied residential array that genuinely needs a smaller inverter, though, this is a tidy and credible option.

Final view

SolaX X1-MINI G4 1.1kW String Inverter with WiFi and AFCI is a compact single-phase inverter that gives small solar systems a properly modern specification. With support for up to 2.2kWp of PV, 200% oversizing, Type II SPD on AC and DC, export control capability, integrated WiFi and an IP66 housing, it offers far more than the bare minimum. For smaller domestic solar projects, it is a well-judged fit.