SolaX X3-PRO-17K-G2 Three-phase Inverter 17 kW
The SolaX X3-PRO-17K-G2 is a 17 kW three-phase string photovoltaic inverter with 2 MPPT, up to 25.5 kWp PV array, maximum efficiency 98.3% and IP66. Same enclosure and same weight as the 15 kW with an additional 2.5 kWp of permitted array capacity: the size with the best ratio between installable power and footprint.
The SolaX X3-PRO-17K-G2 inverter is a 17 kW three-phase string photovoltaic inverter covering the range where most industrial and agricultural roofs stop: 20-25 kWp systems on a warehouse, barn, storage facility or commercial premises with a three-phase meter.
Why 17 kW and not 15 or 20
The three central sizes in the X3-PRO G2 range share the same enclosure, weight, efficiency (98,3% maximum, 97,8% European) and input architecture: 2 MPPTs with 32 A each. Only the output power changes, and with it the permitted photovoltaic array: 22,5 kWp on the 15 kW, 25,5 kWp on the 17 kW, 30 kWp on the 20 kW. The 17 kW is the right choice when the available roof leads to an array between 20 and 25 kWp: the 15 kW would require oversizing beyond the recommended level, while the 20 kW would remain underused, paying for AC power that will never be delivered.
SolaX X3-PRO-17K-G2 technical specifications
| Rated AC power | 17 kW three-phase 3/N/PE 230/400 V |
| Maximum apparent power | 18,7 kVA (AC overload 110%) |
| Rated / maximum output current | 25,8 A / 27,5 A |
| Recommended PV power | 25,5 kWp (oversizing 150%) |
| MPPT / strings per MPPT | 2 / 2 |
| Maximum current per MPPT | 32 A (Isc 40 A) |
| Maximum PV voltage | 1100 V |
| MPPT range / start-up voltage | 160-980 V / 200 V |
| Maximum / European efficiency | 98,3% / 97,8% |
| Protection rating | IP66 |
| Cooling | Smart ventilation (below 55 dB) |
| Operating temperature | -30 / +60 °C (derating above 45 °C) |
| Night consumption | below 3 W |
| Protections | Type II SPD on DC and AC side, optional AFCI |
| Communication | USB, RS485, DRM; optional Pocket WiFi/LAN/4G dongle |
| Dimensions / weight | 482 x 417 x 181 mm / 26 kg |
The bottleneck is not power, it is current
On paper, the 17 kW accepts 25,5 kWp, around 57 modules of 450 Wp. In practice, the constraint comes earlier: each MPPT allows 32 A operating current and 40 A short-circuit current, distributed over a maximum of 2 strings. Latest-generation TOPCon and HJT modules have short-circuit currents of around 14-15 A, so two strings in parallel on a single tracker reach 28-30 A: within limits, but with little margin. With high-current modules or in high-irradiance installations, it is advisable to check the actual Isc in the datasheet before finalising the string layout.
Documentation and protections for connection
At 17 kW, the system is well above the 11,08 kW threshold of CEI 0-21: the connection procedure requires the interface panel with SPI relay, the external interface device and the test report. On the inverter side, Type II surge arresters on both sides, DC and AC, are already integrated, which in many field panels avoids duplication. AFCI, the electric arc protection, is available as an option.
Frequently asked questions
What is the real difference between X3-PRO-15K-G2, 17K and 20K?
Only the output power changes and consequently the permitted photovoltaic array: 22,5, 25,5 and 30 kWp. Enclosure, weight (26 kg), efficiency (98,3%), number of MPPTs and input currents are identical. The choice is based on the photovoltaic array that can actually be installed on the roof, not on performance, which is the same.
How many panels are needed for an X3-PRO-17K-G2?
To operate close to rated power, at least 17 kWp is needed, around 38 modules of 450 Wp. The recommended maximum is 25,5 kWp, around 57 modules. They must be distributed over 2 MPPTs with a maximum of 2 strings each, checking that the sum of the currents per tracker remains within 32 A.
Does the X3-PRO-17K-G2 require a CEI 0-21 interface panel?
Yes. Above 11,08 kW, the integrated interface protection is not sufficient: a panel with SPI relay, external interface device and test report are required to be attached to the connection request to the distributor. It should be included in the quote together with the inverter.
Is a field panel with separate surge arresters needed?
The inverter already integrates Type II SPDs on both the DC side and the AC side. A field panel with only surge arresters therefore becomes redundant in most residential and light commercial installations. It remains useful when individual string disconnection, string fuses are required, or when the distance between the array and the inverter is high.
Can I control a heat pump with this inverter?
Yes, the X3-PRO G2 integrates smart load management, allowing users such as a heat pump or wallbox to be activated when photovoltaic production exceeds instantaneous consumption. Reading the point of exchange requires an external energy meter, the same one needed for export control.
