X3-PRO-20K-G2
The Solax X3-PRO-20K-G2 is a 20 kW three-phase string photovoltaic inverter — the top of the X3-PRO G2 series. With 2 MPPT, efficiency up to 98.5%, IP66 protection, and PV oversizing up to 150% (up to 30 kWp), it is the ideal solution for commercial installations on warehouses and light industrial structures.
The Solax X3-PRO-20K-G2 is a 20 kW three-phase string photovoltaic inverter — the flagship model of the X3-PRO G2 series. Designed for commercial and light industrial PV systems that require the highest power in the range, it combines high efficiency of 98.5% with the robust construction typical of the PRO series.
Solax X3-PRO-20K-G2 Technical Specifications
| Nominal AC Power | 20 kW |
| Number of MPPTs | 2 |
| PV Input Oversizing | 150% |
| Maximum Efficiency | 98.5% |
| Protection Rating | IP66 |
| DC Switch | Integrated |
| Export Control | Integrated |
| Dimensions | 482 × 417 × 181 mm |
| Weight | 26 kg |
| Warranty | 5 years |
The Top of the X3-PRO G2 Range
The 20K model is the largest size in the X3-PRO G2 series before moving up to the X3-Mega G2 range (from 40–60 kW). With 150% oversizing, it allows PV generators up to 30 kWp on a 20 kW inverter. This makes it particularly suitable for medium-large rooftop installations (warehouses, storage facilities, shopping centers) where a single high-power string inverter is needed without battery storage.
Frequently Asked Questions
Does the X3-PRO-20K-G2 require medium voltage connection?
No, the X3-PRO-20K-G2 is an inverter for low voltage networks (400 V AC three-phase). For systems with power above 20 kW connected to the grid, CEI 0-21 compliance is required and potentially an interface panel. For medium voltage connections (>100 kW), the MV versions of the X3-Forth series or other dedicated inverters should be considered.
Is the X3-PRO-20K-G2 suitable for a 30 kWp system on a warehouse?
Yes, with 150% oversizing, it is possible to connect up to 30 kWp to a single X3-PRO-20K-G2. For south-facing roofs with good exposure, this ratio is optimal. For east-west roofs or those with significant shading, it may be preferable to use two smaller inverters with more MPPTs to manage the different roof sections separately.
Can multiple X3-PRO-20K-G2 inverters be installed in parallel on the same system?
Yes, multiple X3-PRO G2 inverters can be installed in parallel on the same system, with the strings divided among the units. Aggregated monitoring via Solax DataHub allows centralized management of all inverters. For systems above 20 kW, this is the standard solution with low voltage inverters.
Can the X3-PRO-20K-G2 be used with a storage system?
The X3-PRO G2 is a string inverter without battery management. To add storage to a system with the X3-PRO-20K-G2, you can pair it with a Solax X1-FIT retrofit inverter or replace it with an X3-Hybrid G4 or X3-Ultra. Alternatively, storage can be managed by a dedicated hybrid inverter connected in parallel to the system.
What documentation is required for connecting an X3-PRO-20K-G2 to the grid?
For systems with 20 kW inverters in low voltage, the CEI 0-21 declaration of conformity is required, available in the official Solax documentation. The connection application to the local distributor (ENEL, Terna, or others) requires the single-line diagram, the inverter technical data sheet, and the declaration of conformity to the technical connection standards.
