Solis S6-GU3P300K06-EV-ND300kW 1500V three-phase string inverter, 6 MPPT

Overview

The S6-GU3P300K06-EV-ND is the 300kW model of the Solis S6-GU3P(275-350)K06-EV-ND series of 1500V string inverters for utility-scale and large commercial plants; suppliers sometimes list it as S6-GU300K06-EV-ND. Six MPP trackers take up to 30 strings and 80A per tracker in the 480–1500V range. The 800V three-phase output, at up to 216.5A, is fed through a medium-voltage transformer, and the manual recommends a 315A AC breaker. Peak efficiency is 99.0%, and the 119kg IP66 housing integrates PID recovery and night-time SVG.

• 275, 300, 333 and 350kW, 3/PE 800V
• 6 MPPT, 70A or 80A per tracker
• 1500V max. input, 480–1500V MPPT
• Max. efficiency 99.0%, EU 98.7%
• Night SVG, PID recovery, I-V scan
• IP66, C5-M anti-corrosion level

How it works

The S6-GU3P(275-350)K06-EV-ND is a transformerless 1500V string inverter for utility-scale PV plants and large commercial and industrial systems. Its AC output is three-phase 800V without neutral, so it connects to the grid through a dedicated medium-voltage transformer. Six MPP trackers take 24 strings on the 275kW model and up to 30 strings on the larger models, with 70A or 80A per tracker for 182mm and 210mm bifacial modules.

The MPPT window runs from 480V to 1500V with a 500V start-up voltage. Solis states a DC/AC ratio above 150%, 99.0% peak and 98.7% European efficiency, and a patented heat-transfer design that allows a 5% continuous output increase at high temperature.

Key features

String monitoring, smart I-V curve scan and online grounding-fault detection help locate faults quickly. The DC switch can be released remotely after an intelligent string break, and AC and DC terminal temperatures are monitored. A night-time SVG function and 30ms reactive power response let the inverter provide reactive power, and PID recovery is integrated; the manual notes that anti-PID requires an IT-system transformer and 1.8/3kV AC cable.

Installation and compatibility

The IP66 housing measures 1098×813×378.5mm, weighs 117–119kg and is rated for corrosion class C5-M, with low-temperature antifreeze, reverse dust removal and internal dehumidification. Solis asks for 1000mm in front, 600mm at the sides and below and 200mm above a single inverter. Aluminium AC cables up to 400mm² connect to OT terminals, and the manual gives a recommended AC protection rating for each model, for example 350A for the 333kW version.

Grid connection standards listed are EN 50549, G99, VDE 0126, IEC 61727, VDE-AR-N 4110 and CEA 2019. For Italy, Solis publishes a CEI 0-16 declaration of conformity and certificate; a VDE-AR-N 4110/4120/4130 confirmation is available for Germany. Stacking inverters vertically is not recommended, and nothing should be stored on or against the housing.

Monitoring and settings

Status is shown by LED indicators and the inverter is commissioned through the Solis app over Bluetooth. RS485 is standard and power-line communication (PLC) over the AC cables is optional, which saves separate communication wiring in large plants. Daytime anti-PID operation requires a Solis S3 logger, and plant-level monitoring runs through SolisCloud.

Questions and answers