X3 FORTH 80K
The Solax X3 Forth 80K is the 80 kW three-phase string inverter from the X3-Forth series for industrial and ground-mounted systems. 99% efficiency, 9 MPPT (18 inputs), max DC voltage 1100 V, 150% oversizing, IP66, fuse-free design, I-V diagnosis, night-time reactive power compensation. 6-year warranty.
The Solax X3 Forth 80K is an 80 kW three-phase string photovoltaic inverter from the X3-Forth series, Solax’s flagship range for large-scale industrial, commercial, and ground-mounted photovoltaic plants. With outstanding efficiency up to 99%, 9 MPPT, and DC voltage up to 1100 V, it is designed to maximize the energy yield of 80 kW systems with complex arrays and state-of-the-art panels.
X3-Forth Series: the Solax industrial inverter from 80 to 125 kW
The X3-Forth series represents the high-power segment of the Solax range for industrial applications. The 80K model features 9 MPPT with 18 total string inputs, a maximum DC current of 32 A per MPPT, and a maximum short-circuit current per string of 46 A. The fuse-free design with intelligent string current monitoring eliminates a critical failure point and reduces maintenance costs. The smart air cooling reduces the system’s size and weight by over 5% compared to previous solutions.
X3 Forth 80K Technical Specifications
| Nominal AC Power | 80 kW |
| Type | Three-phase string inverter — X3-Forth series |
| Number of MPPT | 9 MPPT, 2 strings per MPPT (18 total inputs) |
| Max DC current per MPPT | 32 A |
| Max short-circuit current per MPPT | 46 A |
| Maximum DC voltage | 1100 V |
| DC oversizing | 150% |
| AC overload | 110% |
| Maximum efficiency | 99% |
| Maximum MPPT efficiency | 99.9% |
| MPPT range | 180–1000 V DC |
| Protection rating | IP66 |
| SPD | Type II AC and DC side (Type I+II optional) |
| AFCI | Optional |
| Fuse-free design | Yes (with intelligent string current monitoring) |
| I-V diagnosis | Yes |
| Nighttime reactive compensation | Yes |
| Communication | RS485, WiFi / LAN / 4G (optional), PLC (optional) |
| Aluminum AC cable connection | Available |
| Dimensions | 985 × 660 × 327.5 mm |
| Weight | 83 kg |
| Warranty | 6 years (5 standard + 1 with SolaX cloud connection) |
Advanced features for large industrial plants
The X3-Forth series includes AC terminal temperature detection — an active protection that prevents damage from overheating of output connections, which is especially critical in large industrial plants. The nighttime reactive power compensation optimizes the plant’s power factor even during hours without PV production. The integrated export control, combined with the EMS PRO 1000 system or a DTSU666-CT smart meter, ensures compliance with feed-in limits agreed with the distributor on an industrial scale.
What is included in the supply?
- Solax X3 Forth 80K three-phase string inverter
- Integrated DC isolator
- Installation manual
Frequently Asked Questions
What is the maximum PV power that can be connected to the X3 Forth 80K?
With DC oversizing at 150%, the X3 Forth 80K can handle up to ~120 kWp of photovoltaic panels (80 kW × 1.5). With 9 MPPT and 18 string inputs, the power is distributed over 9 independent sections of ~13 kWp each, ideal for large installations on industrial roofs or ground-mounted systems with a complex layout.
What is the fuse-free design of the X3-Forth series?
The fuse-free design of the X3-Forth series eliminates the string protection fuses typically found in external string boxes, replacing them with an integrated intelligent string current monitoring system within the inverter. This reduces components subject to periodic replacement, lowers maintenance costs, and improves the overall reliability of the system.
Is the X3 Forth 80K suitable for ground-mounted agrivoltaic systems?
Yes. With IP66 protection, an extended operating temperature range, and the option for aluminum AC cable connection, the X3 Forth 80K is suitable for ground-mounted, agrivoltaic, and utility-scale systems. The optional PLC (Power Line Communication) connection simplifies communication in large photovoltaic parks where RS485 cabling between inverters would be long and expensive.
What is the difference between the X3 Forth 80K and the X3-MGA-60K-G2?
The X3-MGA G2 series (40–60 kW) and the X3-Forth series (80–125 kW) are positioned in different power ranges and do not overlap. The Forth 80K offers higher efficiency (99% vs 98.4%), 9 MPPT vs max 6, fuse-free design, AC terminal temperature detection, and a 6-year warranty vs 5. It is also physically much larger and heavier (83 kg vs 45 kg).
Does the X3 Forth 80K support the PLC protocol for utility-scale plants?
Yes. The X3-Forth series optionally supports PLC (Power Line Communication), which allows the transmission of production and monitoring data through the existing AC power cables in the plant, eliminating the need for separate communication cabling (RS485/Ethernet). This feature is especially useful in large photovoltaic parks with dozens or hundreds of inverters distributed over wide areas.
