X3-MGA-40K-G2
The Solax X3-MGA-40K-G2 is the 40 kW three-phase string inverter from the X3-MGA G2 (Mega) series. 98.4% efficiency, 5 MPPT (10 inputs), max DC voltage 1100 V, 150% oversizing, IP66 protection, I-V diagnosis, smart cooling. For C&I and ground-mounted systems from 40 to ~60 kWp.
The Solax X3-MGA-40K-G2 is a 40 kW three-phase string photovoltaic inverter, part of the X3-MGA G2 (Mega) series — the Solax range designed for large-scale C&I plants with complex photovoltaic arrays. With a maximum efficiency of 98.4%, DC voltage up to 1100 V, and up to 5 MPPT with dual string input, it is the reference solution for warehouses, shopping centers, and ground-mounted systems from 40 kW upwards.
X3-MGA G2 Series: the Solax string inverter for large C&I
The X3-MGA G2 series stands out from the X3-PRO G2 for its ability to handle higher power plants and more complex string configurations. With the X3-MGA-40K-G2 model, you have 5 MPPT and 10 string inputs, allowing you to manage arrays oriented in 5 different directions completely independently. The advanced heat dissipation technology reduces weight and size by over 10% compared to previous generation inverters of similar capacity. The smart air cooling extends fan life and ensures long-term reliability.
X3-MGA-40K-G2 Technical Specifications
| Nominal AC Power | 40 kW |
| Type | Three-phase string inverter — X3-MGA G2 (Mega) series |
| Number of MPPT | 5 MPPT, 2 strings per MPPT (10 total inputs) |
| Max DC current per MPPT | 32 A |
| Max current per string | 16 A |
| Maximum DC voltage | 1100 V |
| DC oversizing | 150% |
| AC overload | 110% |
| Maximum efficiency | 98.4% |
| MPPT range | 180–1000 V DC |
| Protection rating | IP66 |
| SPD | Type II on AC and DC side |
| AFCI | Optional |
| I-V diagnosis | Yes (smart I-V curve) |
| Nighttime reactive power compensation | Yes |
| Communication | RS485, WiFi / LAN / 4G (optional) |
| Dimensions | 521 × 630 × 286 mm |
| Weight | 44 kg |
Smart functions for large-scale plants
The X3-MGA-40K-G2 includes smart I-V curve diagnosis, which automatically detects anomalies in the photovoltaic strings (shading, degradation, faulty connections) without interrupting production. The nighttime reactive power compensation improves grid stability and the plant’s power factor. The integrated export control, combined with a three-phase smart meter DTSU666-D or DTSU666-CT, ensures compliance with feed-in limits imposed by the utility.
What is included in the supply?
- Solax X3-MGA-40K-G2 three-phase string inverter
- Integrated DC switch
- Installation manual
Frequently Asked Questions
What is the main difference between X3-MGA G2 and X3-PRO G2?
The X3-PRO G2 covers power ratings from 8 to 30 kW with a maximum of 3 MPPT. The X3-MGA G2 covers power ratings from 40 to 60 kW with up to 6 MPPT (60K version) and 12 string inputs, designed for complex photovoltaic arrays on large surfaces. The two products do not overlap in terms of size and have significantly different physical dimensions.
Does the X3-MGA-40K-G2 support battery storage?
No. The X3-MGA-40K-G2 is a pure string inverter, without battery ports. To add storage to a 40 kW system, you need to pair it with a retrofit storage inverter (e.g., X3-FIT G4) or directly design the system with a hybrid inverter such as the X3-ULT (three-phase hybrid C&I up to 30 kW per unit) in a multi-inverter configuration.
What is the I-V curve diagnosis of the X3-MGA G2?
The smart I-V curve diagnosis is an integrated function that allows the inverter to periodically scan the current-voltage characteristic of each connected PV string, automatically detecting anomalies such as defective cells, loose connections, PID (Potential Induced Degradation), or persistent shading. The result is preventive maintenance without manual intervention by the installer.
Is the X3-MGA-40K-G2 suitable for an agricultural ground-mounted system?
Yes. The X3-MGA-40K-G2 with IP66 protection and an operating temperature range up to 60°C is suitable for outdoor installations in ground-mounted systems, including agrivoltaic plants. With 5 independent MPPTs, it can manage arrays with different orientations (e.g., east-west on low-slope structures), optimizing yield at different times of the day.
What is the maximum PV power that can be connected to the X3-MGA-40K-G2?
With DC oversizing at 150%, the X3-MGA-40K-G2 can handle up to ~60 kWp of photovoltaic panels (40 kW × 1.5). The practical limit also depends on the string configuration and the open-circuit voltage, which must remain within the maximum 1100 V DC allowed by the inverter. The array design must be validated by a qualified professional.
