X3 FORTH 120K
The Solax X3 Forth 120K is a 120 kW three-phase photovoltaic inverter with 12 independent MPPTs for complex commercial and industrial installations. Maximum DC voltage 1100 V, IP66 protection, integrated zero feed-in function, and 24/7 cloud monitoring. Ideal for PV systems with multiple roof sections or orientations.
The Solax X3 Forth 120K is a 120 kW three-phase photovoltaic inverter designed for large commercial and industrial installations. With the jump from 9 to 12 independent MPPTs compared to lower models in the same range, the X3 Forth 120K is the optimal choice for extensive photovoltaic fields with complex layouts or multiple orientations, where the granularity of MPPT tracking directly translates into higher annual production.
Why choose the Solax X3 Forth 120K?
The 120K model introduces 12 MPPTs with 2 strings per tracker, for a total of 24 independent string inputs. This feature clearly distinguishes it from the 100K and 110K models (9 MPPTs) and makes it ideal for installations on industrial warehouses with multiple roof sections, or on land with varying orientation or slope. The maximum input voltage of 1100 V DC and generator oversizing up to 150% (up to 180 kWp installable) allow for systems with an excellent cost/kWh ratio over a twenty-year lifecycle.
Solax X3 Forth 120K Technical Specifications
| Nominal AC Power | 120 kW |
| Number of MPPTs | 12 |
| Strings per MPPT | 2 |
| Maximum DC Voltage | 1100 V |
| MPPT Voltage Range | 180–1000 V DC |
| Max Short-Circuit Current per MPPT | 46 A |
| PV Input Oversizing | 150% |
| Maximum Efficiency | 99.9% |
| Protection Rating | IP66 |
| SPD Protection | Type II (DC and AC) |
| AFCI Protection | Optional |
| Cooling | High-durability intelligent ventilation |
| Fuse Design | Fuseless with integrated string current monitoring |
| Dimensions | 985 × 660 × 327.5 mm |
| Weight | 87 kg |
| Warranty | 5 years (6 years with active cloud) |
Smart Monitoring and Advanced Diagnostics
The Solax X3 Forth 120K is natively connected to the Solax cloud platform for real-time monitoring of production, the status of each MPPT, and any alarms. The intelligent I-V curve diagnosis automatically identifies abnormal strings by comparing the detected profile with the expected one for the current irradiation conditions. Firmware updates and changes to operating parameters are performed remotely without interrupting production.
Regulatory Compliance and Export Control
Like all X3 Forth inverters, the 120K model natively supports the power export control function (zero feed-in), which is mandatory for many commercial systems connected to the public grid. The nighttime reactive power compensation ensures compliance with CEI 0-16 (medium voltage) and CEI 0-21 (low voltage) regulations. The PLC communication system is available as an option for installations with specific telemetry requirements.
What is included in the supply?
- Solax X3 Forth 120K inverter
- Integrated SPD Type II protection (DC and AC)
- AC connector compatibility for aluminum cable
- Technical documentation and official Solax datasheet
Frequently Asked Questions
What is the advantage of the 12 MPPTs of the X3 Forth 120K compared to models with 9 MPPTs?
With 12 MPPTs instead of 9, the X3 Forth 120K can manage up to 24 independent strings. This allows you to separate groups of panels with different orientations, inclinations, or lengths, minimizing mismatch losses. It is the ideal choice for installations on multiple roof sections of a warehouse, on pergola structures with variable orientations, or on land with localized shading.
How many kWp of panels can be installed on an X3 Forth 120K?
Thanks to the 150% oversizing, it is possible to connect up to 180 kWp of photovoltaic generator to the 120 kW inverter. This practice, commonly used in Italian commercial systems, maximizes the hours of full power operation and return on investment, accepting a limited power cut (clipping) during maximum irradiation peaks.
Is the Solax X3 Forth 120K suitable for installations on industrial warehouses?
Absolutely yes. Thanks to the 12 independent MPPTs, it is possible to separately connect panels installed on roof sections with different orientations (e.g., southeast and southwest) without penalizing overall production. The IP66 protection makes it suitable for installation even in industrial environments with dust or humidity.
Does the X3 Forth 120K require the same installation structure as the 100K and 110K?
The dimensions are identical (985 × 660 × 327.5 mm), but the weight is slightly higher: 87 kg compared to 83 kg for the 100K and 110K models. The anchoring structure must therefore be sized accordingly. Otherwise, the installation requirements, AC and DC connections, and configuration are similar to the other X3 Forth models.
How is monitoring carried out for a system with multiple X3 Forth 120K inverters?
X3 Forth inverters integrate with the Solax cloud platform via the datalogger module (Pocket LAN or Pocket Wi-Fi+LAN). The DataHub1000 is the dedicated solution for installations with multiple units, allowing aggregated monitoring, centralized power management, and control of the zero feed-in function for the entire system from a single interface.
