SolaX X1-BOOST-4.2K-G4 PV grid-connected inverter 4.2kW with dual MPPT 1-phase

The SolaX X1-BOOST-4 .2K-G4 (MPN: 1030150048) is a compact and powerful PV grid-connected inverter for single-phase solar systems in private homes. With a rated power of 4.2 kW, two MPP trackers, up to 200% DC oversizing, and a peak efficiency of 98%, it ensures maximum energy yield—even with different roof orientations. The fanless, IP66-certified inverter offers intelligent functions such as integrated export control, real-time cloud updates every 10 seconds, and the option to conveniently configure the entire system via an app. Thanks to parallel operation with up to 5 devices, it is flexibly expandable and future-proof.

Your advantages with the SolaX X1-BOOST

• Dual MPPT technology: for optimal energy yields with different roof pitches and orientations
• High efficiency: up to 98% efficiency – more self-generated electricity, less grid consumption
• 200% DC oversizing: maximum flexibility in system design
• Parallel operation: possible with up to 5 inverters – ideal for larger systems
• Real-time data: cloud update every 10 seconds for precise monitoring
• Integrated export control: for optimized feed-in management
• App configuration: settings can be adjusted directly and conveniently from a smartphone
• IP66-certified housing: robust for outdoor use
• Fanless operation: quiet, low maintenance, and durable
• High safety: Type II surge protection, AFCI-ready & Rapid Shutdown prepared
• Manufacturer product warranty: 5 years, information can be found here

Areas of application

• Single-phase photovoltaic systems up to approx. 9 kWp
• Roofs with east-west, south, or flat roof combinations
• Smart households with heat pumps, wall boxes, or energy management systems

Maximum efficiency for your own consumption

With a maximum efficiency of 98%, the X1-BOOST-4.2K-G4 is one of the most efficient single-phase inverters in its class. The European efficiency rating is an excellent 97%, which guarantees outstanding energy yield—even in partial shade or with less than optimal module orientation.

Dual MPPT technology for flexible system planning

Thanks to its two independent MPP trackers, the inverter is ideal for roof areas with different orientations—for example, east/west—or where individual modules are partially shaded. Each tracker can be configured independently, which significantly increases system performance and allows for more flexible planning.

200% DC oversizing – more PV power, more electricity

The X1-BOOST-4.2K-G4 supports DC input oversubscription of up to 200%. This means that you can connect significantly more PV modules than the AC rated power actually specifies. This means that even in low sunlight conditions, electricity is produced early and efficiently – for a significantly higher share of self-consumption.

Fanless, quiet, and IP66-protected

The inverter does not require a mechanical fan. This reduces noise to less than 25 dB, making it virtually silent – ideal for installation near residential areas. The robust IP66 housing provides reliable protection against dust and water, so that even outdoor installation is no problem.

Smart control via app and cloud

The integrated WiFi interface enables a direct connection to the SolaX Cloud. You can access system data, detect errors, or analyze statistics in real time via smartphone or PC. The app also offers easy commissioning and remote maintenance – perfect for installers and operators.

Safe and future-proof – with AFCI and Rapid Shutdown

With integrated surge protection (type II for AC and DC), arc detection (AFCI-ready), and rapid shutdown preparation, the inverter meets all current safety standards. Optionally, you can operate up to five devices in parallel without an external EMS control center – ideal for modular system expansions.

Technical data

PV input

• Max. recommended PV system power: 8.0 kWp
• Max. PV input voltage: 600 V
• Nominal PV input voltage: 360 V
• Operating voltage range: 35–600 V
• MPPT voltage range: 40–560 V
• Start voltage: 50 V
• Number of MPP trackers: 2
• Number of strings per MPPT: 1
• Max. input current per MPPT: 16 A
• Max. input short-circuit current per MPPT: 22 A

AC output

• Nominal output power: 4200 W
• Nominal output current: 18.3 A
• Max. apparent output power: 4620 VA
• Max. continuous output current: 20.1 A
• AC rated voltage: 1 / N / PE, 220 / 230 / 240 V
• AC rated frequency: 50 Hz / 60 Hz

General

• Max. efficiency: 98.0%
• European efficiency: 97.0%
• Protection class: IP66
• Operating temperature range: -25°C to +60°C
• Relative humidity: 0–100% (condensing)
• Communication: RS485, DRM, optional meter, CT
• Power consumption (night): < 3 W
• Dimensions: 404 × 274 × 146 mm
• Weight: 11.0 kg

Scope of delivery:

• 1 SolaX X1-BOOST-4.2K-G4 inverter (single-phase)
• Integrated WLAN unit (WiFi stick)
• Wall bracket including screw set
• Quick start guide & user documentation