SolaX X1-BOOST G4 3.6kW Single-Phase String Inverter

A very strong fit for mainstream domestic solar

SolaX X1-BOOST G4 3.6kW Single-Phase String Inverter sits in a particularly useful part of the residential market. It is large enough to support a meaningful home solar system, but still compact enough to avoid feeling excessive for typical single-phase domestic installs. That balance, combined with dual MPPT tracking, makes it one of the most practical sizes in the X1-BOOST G4 range for UK homes.

Rather than being a basic entry-level inverter, this model is designed for properties that want a properly capable grid-tied platform with good DC headroom, modern monitoring and sensible safety features. It is especially attractive where the roof layout would benefit from two trackers and the customer wants a current inverter that still feels proportionate to the project.

Why the 3.6kW version is so commercially useful

The strength of this model is how neatly it matches modern domestic solar requirements. With 3680W rated output and support for up to 7.2kWp of recommended PV input, it allows installers to design around today’s higher-output modules without the inverter becoming a bottleneck. That is important on real-world roofs, where available space can quickly produce more DC capacity than older, smaller inverters were comfortable handling.

It therefore suits a wide range of ordinary home solar projects. Family houses, bungalows, retrofit systems and modest new-builds can all land comfortably in this size bracket, especially where the installer wants dual-MPPT flexibility without moving into a bulkier product family.

Key specifications and what they mean

• 3680W rated output
• Up to 7.2kWp recommended PV input
• 200% DC oversizing support
• Dual MPPT design with one string per tracker
• 40 to 560V MPPT range and 50V start-up voltage
• 16A maximum input current and 22A short-circuit current per MPPT
• Type II SPD on both AC and DC
• Built-in export control
• WiFi and app-based setup and monitoring
• IP66 enclosure with natural cooling

Those numbers have obvious practical value. The dual-MPPT arrangement improves design flexibility. The wide voltage range keeps string design comfortable. The strong current allowance matters with modern high-current modules. And the 7.2kWp array support means the inverter can handle a serious domestic system while staying within a manageable wall-mounted format.

Protection, monitoring and usability

SolaX gives the X1-BOOST G4 platform a robust set of residential features, and this 3.6kW version benefits from that full approach. Built-in Type II surge protection on AC and DC is a major plus, while the wider inverter platform includes anti-islanding protection, reverse-polarity protection, grid monitoring, DC injection monitoring and temperature protection. That helps ensure the product feels properly specified rather than lightly equipped.

WiFi and app-based commissioning are equally relevant in day-to-day use. Installers want simple setup and easy access to performance data, while homeowners increasingly expect a clearer view of what their solar system is doing. Export control capability adds further relevance for sites where that function needs to be planned in from the start.

Installation and real-world fit

At around 404 x 274 x 146 mm and around 11kg, the unit remains manageable for standard domestic wall mounting. It fits well in garages, utility spaces and sheltered external locations where an IP66-rated housing is beneficial. Natural cooling also makes it quieter in use, which is an advantage in homes where low-maintenance operation matters.

Because the inverter uses two MPPTs, it is more adaptable than a one-tracker model while still being much simpler than larger commercial platforms. That makes it a very strong residential choice for installers who want a clean balance between flexibility, size and cost.

Who it suits best

The 3.6kW X1-BOOST G4 is ideal for homes that need a more capable everyday solar inverter than smaller entry-level units can offer. It works particularly well on single-phase family homes, bungalows and retrofit properties where the array size is meaningful and the roof layout benefits from dual tracking.

Among the residential BOOST options, this is one of the easiest to recommend because it lands in such a useful middle ground. It gives enough capacity for many real-world systems without pushing the project into unnecessary size or complexity.

Final view

SolaX X1-BOOST G4 3.6kW Single-Phase String Inverter is a highly balanced residential inverter that combines dual-MPPT design, strong oversizing support and current protection features in a compact IP66 housing. With up to 7.2kWp of PV support, built-in export control, WiFi setup and Type II SPD on AC and DC, it is an excellent fit for everyday home solar systems that need both flexibility and sensible headroom.