Solis-110K-5G-PRO110kW three-phase grid-tied string inverter, 8 MPPT

Overview

The Solis-110K-5G-PRO is the largest model of the Solis-(80-110)K-5G-PRO three-phase string inverter series for commercial and industrial plants. Its eight MPP trackers accept 16 strings with 40A or 32A per tracker, and maximum AC output reaches 121kVA at 98.5% peak and 98.0% European efficiency. The manual specifies a 250A AC protection device; the unit weighs about 98kg and is rated IP66. For uneven string layouts Solis gives per-string power limits of 9.2kW with 182mm and 12.2kW with 210mm modules.

• 80, 100 and 110kW, 3/N/PE 380/400V
• 6 MPPT (80kW) or 8 MPPT (100–110kW)
• 40A/32A per tracker, 1100V max. input
• Max. efficiency 98.5%, EU 98.0%
• String monitoring, I-V scan, night SVG
• IP66, AFCI integrated (activation required)

How it works

The Solis-(80-110)K-5G-PRO is a transformerless three-phase string inverter of the fifth generation for commercial and industrial PV systems. The 80kW model has six MPP trackers and the 100kW and 110kW models eight, each with two strings; trackers alternate between 40A and 32A input current, which suits bifacial modules. The MPPT window is 160–1000V with a 1100V maximum input and a 180V start-up voltage.

Maximum AC output is 10% above the rated power, for example 121kVA on the 110kW model, with 98.5% peak and 98.0% European efficiency. Solis states a DC/AC ratio above 150%, and the DC side supports Y-branch string connection. Night-time self-consumption is below 2W, and the inverter operates from -30°C to +60°C up to 4000m altitude.

Key features

Each string is monitored, and a smart I-V curve scan helps find module faults. A night-time SVG function supplies reactive power without PV production. AFCI arc fault protection is integrated and must be activated; PID recovery and an integrated AC switch are optional, and DC and AC type II surge protection and a DC switch are built in. Firmware can be updated remotely, and power-line communication (PLC) is available as an option.

Installation and compatibility

The 100kW and 110kW models measure 1183×585×363mm, or 1295mm wide with the optional AC switch, and weigh about 98kg according to the manual; the 80kW model is smaller. Solis asks for 500mm between inverters and from the ground. AC cables connect to OT terminals, and the manual specifies a protection device of 150A for the 80kW, 200A for the 100kW and 250A for the 110kW model.

Inside the 100–110kW models are four power modules, each fed by four inputs. Solis recommends loading them evenly, within 5%; otherwise each string should not exceed 9.2kW with 182mm modules or 12.2kW with 210mm modules. For Italy, CEI 0-21 and CEI 0-16 declarations and certificates are published.

Monitoring and settings

Settings are made on the LCD display. RS485 is standard, and Wi-Fi, GPRS or PLC communication can be added for monitoring in SolisCloud and remote firmware updates. Grid connection standards listed in the manual are G99, IEC 61727, EN 50549-1/-2 and VDE-AR-N 4110, and EN 50549 certificates are available alongside the Italian documents.

Questions and answers