SolaX X1-BOOST G4 2.5–6kW Single-Phase String Inverter – Dual MPPT, 200% PV Oversizing, IP66

Every model in the X1-BOOST G4 range accepts twice its rated AC output in PV array power. The 6 kW model, for example, handles up to 12,000 Wp of panel capacity. Combined with a maximum PV input current of 16 A per MPPT (Isc 22 A), the inverter is fully compatible with modern high-power 420–440 W panels and bifacial modules — no need to derate the string configuration.

Two fully independent MPPT channels — each with its own 40–560 V tracking range — allow strings on different roof orientations, tilts, or shading profiles to be optimised simultaneously. This is especially valuable on UK properties with east/west split arrays or partially shaded roofs, where a single-MPPT inverter would force the whole array to the weaker string's operating point.

The inverter begins generating as soon as string voltage reaches just 50 V DC — far lower than many competing models. In UK conditions this translates to earlier morning generation and later evening generation, capturing energy from the extended low-angle sun periods that a higher startup threshold would miss. Over a year, this adds measurable kWh yield on every installation.

The X1-BOOST G4 uses passive thermal management with no fan as standard (an optional internal fan is available for demanding installations). The IP66-rated enclosure is fully weatherproof, allowing outdoor wall mounting without additional shelter. Operating range is –25°C to +60°C, storage temperature –30°C to +70°C. Typical noise output is just 25 dB — near-silent in a domestic setting.

Multiple X1-BOOST G4 units can be operated in a Master/Slave parallel configuration via Modbus, supporting up to five inverters per installation without an external Energy Management System. This makes the X1-BOOST G4 the right tool for larger residential roofs where a single single-phase inverter reaches its limit — simply add units as the array grows, up to 30 kW aggregate output with five 6 kW units.

The G4 generation introduces native smart load control for compatible SolaX EV chargers and heat pumps, enabling excess solar generation to be directed to these high-power loads automatically — without a separate controller. Combined with the built-in export control function and CT/meter input, the inverter handles both zero-export compliance and active self-consumption optimisation in a single unit.

Arc-Fault Circuit Interrupter (AFCI) protection is available as a factory option, detecting dangerous DC arc events in PV string wiring before they can cause a fire. Type II Surge Protective Devices are fitted on the DC side as standard, and AC-side Type II SPD is available as an option. Rapid Shutdown (RSD) readiness is built in, meeting requirements for firefighter-safe systems in regions where RSD is mandated.

The inverter runs a built-in global MPP scan to avoid locking onto a local rather than global power maximum during partial shading — a common yield-reduction issue with simpler MPPT algorithms. The I-V curve diagnosis feature lets installers and O&M teams assess string health remotely through SolaX Cloud, identifying degraded or mismatched panels without a site visit.